CVE-2021-47274 (GCVE-0-2021-47274)
Vulnerability from cvelistv5
Published
2024-05-21 14:20
Modified
2025-05-04 07:07
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Correct the length check which causes memory corruption We've suffered from severe kernel crashes due to memory corruption on our production environment, like, Call Trace: [1640542.554277] general protection fault: 0000 [#1] SMP PTI [1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G [1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190 [1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286 [1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX: 0000000006e931bf [1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI: ffff9a45ff004300 [1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09: 0000000000000000 [1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff9a20608d [1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15: 696c662f65636976 [1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000) knlGS:0000000000000000 [1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4: 00000000003606e0 [1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [1640542.566742] Call Trace: [1640542.567009] anon_vma_clone+0x5d/0x170 [1640542.567417] __split_vma+0x91/0x1a0 [1640542.567777] do_munmap+0x2c6/0x320 [1640542.568128] vm_munmap+0x54/0x70 [1640542.569990] __x64_sys_munmap+0x22/0x30 [1640542.572005] do_syscall_64+0x5b/0x1b0 [1640542.573724] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [1640542.575642] RIP: 0033:0x7f45d6e61e27 James Wang has reproduced it stably on the latest 4.19 LTS. After some debugging, we finally proved that it's due to ftrace buffer out-of-bound access using a debug tool as follows: [ 86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000 [ 86.780806] no_context+0xdf/0x3c0 [ 86.784327] __do_page_fault+0x252/0x470 [ 86.788367] do_page_fault+0x32/0x140 [ 86.792145] page_fault+0x1e/0x30 [ 86.795576] strncpy_from_unsafe+0x66/0xb0 [ 86.799789] fetch_memory_string+0x25/0x40 [ 86.804002] fetch_deref_string+0x51/0x60 [ 86.808134] kprobe_trace_func+0x32d/0x3a0 [ 86.812347] kprobe_dispatcher+0x45/0x50 [ 86.816385] kprobe_ftrace_handler+0x90/0xf0 [ 86.820779] ftrace_ops_assist_func+0xa1/0x140 [ 86.825340] 0xffffffffc00750bf [ 86.828603] do_sys_open+0x5/0x1f0 [ 86.832124] do_syscall_64+0x5b/0x1b0 [ 86.835900] entry_SYSCALL_64_after_hwframe+0x44/0xa9 commit b220c049d519 ("tracing: Check length before giving out the filter buffer") adds length check to protect trace data overflow introduced in 0fc1b09ff1ff, seems that this fix can't prevent overflow entirely, the length check should also take the sizeof entry->array[0] into account, since this array[0] is filled the length of trace data and occupy addtional space and risk overflow.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/2d598902799886d67947406f26ee8e5fd2ca097f Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/31ceae385556c37e4d286cb6378696448f566883 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/43c32c22254b9328d7abb1c2b0f689dc67838e60 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/b16a249eca2230c2cd66fa1d4b94743bd9b6ef92 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/d63f00ec908b3be635ead5d6029cc94246e1f38d Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/edcce01e0e50840a9aa6a70baed21477bdd2c9f9 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/2d598902799886d67947406f26ee8e5fd2ca097f Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/31ceae385556c37e4d286cb6378696448f566883 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/43c32c22254b9328d7abb1c2b0f689dc67838e60 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/b16a249eca2230c2cd66fa1d4b94743bd9b6ef92 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/d63f00ec908b3be635ead5d6029cc94246e1f38d Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/edcce01e0e50840a9aa6a70baed21477bdd2c9f9 Patch
Impacted products
Vendor Product Version
Linux Linux Version: 2e584b1a02eeb860e286d39bc408b25ebc5ec844
Version: e46d433754420b4d6513ca389403de88a0910279
Version: 0572fc6a510add9029b113239eaabf4b5bce8ec9
Version: a0997a86f5c0085e183ddee5fb72091d584d3d16
Version: 7c93d8cff582c459350d6f8906eea6e4cd60d959
Version: b220c049d5196dd94d992dd2dc8cba1a5e6123bf
Version: b220c049d5196dd94d992dd2dc8cba1a5e6123bf
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Correct the length check which causes memory corruption\n\nWe\u0027ve suffered from severe kernel crashes due to memory corruption on\nour production environment, like,\n\nCall Trace:\n[1640542.554277] general protection fault: 0000 [#1] SMP PTI\n[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G\n[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190\n[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286\n[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:\n0000000006e931bf\n[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:\nffff9a45ff004300\n[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:\n0000000000000000\n[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:\nffffffff9a20608d\n[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:\n696c662f65636976\n[1640542.563128] FS:  00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)\nknlGS:0000000000000000\n[1640542.563937] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:\n00000000003606e0\n[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\n0000000000000000\n[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\n0000000000000400\n[1640542.566742] Call Trace:\n[1640542.567009]  anon_vma_clone+0x5d/0x170\n[1640542.567417]  __split_vma+0x91/0x1a0\n[1640542.567777]  do_munmap+0x2c6/0x320\n[1640542.568128]  vm_munmap+0x54/0x70\n[1640542.569990]  __x64_sys_munmap+0x22/0x30\n[1640542.572005]  do_syscall_64+0x5b/0x1b0\n[1640542.573724]  entry_SYSCALL_64_after_hwframe+0x44/0xa9\n[1640542.575642] RIP: 0033:0x7f45d6e61e27\n\nJames Wang has reproduced it stably on the latest 4.19 LTS.\nAfter some debugging, we finally proved that it\u0027s due to ftrace\nbuffer out-of-bound access using a debug tool as follows:\n[   86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000\n[   86.780806]  no_context+0xdf/0x3c0\n[   86.784327]  __do_page_fault+0x252/0x470\n[   86.788367]  do_page_fault+0x32/0x140\n[   86.792145]  page_fault+0x1e/0x30\n[   86.795576]  strncpy_from_unsafe+0x66/0xb0\n[   86.799789]  fetch_memory_string+0x25/0x40\n[   86.804002]  fetch_deref_string+0x51/0x60\n[   86.808134]  kprobe_trace_func+0x32d/0x3a0\n[   86.812347]  kprobe_dispatcher+0x45/0x50\n[   86.816385]  kprobe_ftrace_handler+0x90/0xf0\n[   86.820779]  ftrace_ops_assist_func+0xa1/0x140\n[   86.825340]  0xffffffffc00750bf\n[   86.828603]  do_sys_open+0x5/0x1f0\n[   86.832124]  do_syscall_64+0x5b/0x1b0\n[   86.835900]  entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\ncommit b220c049d519 (\"tracing: Check length before giving out\nthe filter buffer\") adds length check to protect trace data\noverflow introduced in 0fc1b09ff1ff, seems that this fix can\u0027t prevent\noverflow entirely, the length check should also take the sizeof\nentry-\u003earray[0] into account, since this array[0] is filled the\nlength of trace data and occupy addtional space and risk overflow."
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      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:07:41.320Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/edcce01e0e50840a9aa6a70baed21477bdd2c9f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/2d598902799886d67947406f26ee8e5fd2ca097f"
        },
        {
          "url": "https://git.kernel.org/stable/c/31ceae385556c37e4d286cb6378696448f566883"
        },
        {
          "url": "https://git.kernel.org/stable/c/d63f00ec908b3be635ead5d6029cc94246e1f38d"
        },
        {
          "url": "https://git.kernel.org/stable/c/43c32c22254b9328d7abb1c2b0f689dc67838e60"
        },
        {
          "url": "https://git.kernel.org/stable/c/b16a249eca2230c2cd66fa1d4b94743bd9b6ef92"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3"
        }
      ],
      "title": "tracing: Correct the length check which causes memory corruption",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47274",
    "datePublished": "2024-05-21T14:20:02.694Z",
    "dateReserved": "2024-05-21T13:27:52.127Z",
    "dateUpdated": "2025-05-04T07:07:41.320Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47274\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:15.830\",\"lastModified\":\"2025-04-04T14:29:40.560\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing: Correct the length check which causes memory corruption\\n\\nWe\u0027ve suffered from severe kernel crashes due to memory corruption on\\nour production environment, like,\\n\\nCall Trace:\\n[1640542.554277] general protection fault: 0000 [#1] SMP PTI\\n[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G\\n[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190\\n[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286\\n[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:\\n0000000006e931bf\\n[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:\\nffff9a45ff004300\\n[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:\\n0000000000000000\\n[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:\\nffffffff9a20608d\\n[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:\\n696c662f65636976\\n[1640542.563128] FS:  00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)\\nknlGS:0000000000000000\\n[1640542.563937] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:\\n00000000003606e0\\n[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\\n0000000000000000\\n[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\\n0000000000000400\\n[1640542.566742] Call Trace:\\n[1640542.567009]  anon_vma_clone+0x5d/0x170\\n[1640542.567417]  __split_vma+0x91/0x1a0\\n[1640542.567777]  do_munmap+0x2c6/0x320\\n[1640542.568128]  vm_munmap+0x54/0x70\\n[1640542.569990]  __x64_sys_munmap+0x22/0x30\\n[1640542.572005]  do_syscall_64+0x5b/0x1b0\\n[1640542.573724]  entry_SYSCALL_64_after_hwframe+0x44/0xa9\\n[1640542.575642] RIP: 0033:0x7f45d6e61e27\\n\\nJames Wang has reproduced it stably on the latest 4.19 LTS.\\nAfter some debugging, we finally proved that it\u0027s due to ftrace\\nbuffer out-of-bound access using a debug tool as follows:\\n[   86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000\\n[   86.780806]  no_context+0xdf/0x3c0\\n[   86.784327]  __do_page_fault+0x252/0x470\\n[   86.788367]  do_page_fault+0x32/0x140\\n[   86.792145]  page_fault+0x1e/0x30\\n[   86.795576]  strncpy_from_unsafe+0x66/0xb0\\n[   86.799789]  fetch_memory_string+0x25/0x40\\n[   86.804002]  fetch_deref_string+0x51/0x60\\n[   86.808134]  kprobe_trace_func+0x32d/0x3a0\\n[   86.812347]  kprobe_dispatcher+0x45/0x50\\n[   86.816385]  kprobe_ftrace_handler+0x90/0xf0\\n[   86.820779]  ftrace_ops_assist_func+0xa1/0x140\\n[   86.825340]  0xffffffffc00750bf\\n[   86.828603]  do_sys_open+0x5/0x1f0\\n[   86.832124]  do_syscall_64+0x5b/0x1b0\\n[   86.835900]  entry_SYSCALL_64_after_hwframe+0x44/0xa9\\n\\ncommit b220c049d519 (\\\"tracing: Check length before giving out\\nthe filter buffer\\\") adds length check to protect trace data\\noverflow introduced in 0fc1b09ff1ff, seems that this fix can\u0027t prevent\\noverflow entirely, the length check should also take the sizeof\\nentry-\u003earray[0] into account, since this array[0] is filled the\\nlength of trace data and occupy addtional space and risk overflow.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: rastreo: corrija la verificaci\u00f3n de longitud que causa corrupci\u00f3n de la memoria. Hemos sufrido fallos graves del kernel debido a la corrupci\u00f3n de la memoria en nuestro entorno de producci\u00f3n, como Call Trace: [1640542.554277] fallo de protecci\u00f3n general. : 0000 [#1] SMP PTI [1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: cargado Contaminado:G [1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190 [1640542.559074] : 0018:ffffb16faa597df8 EFLAGS: 00010286 [ 1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX: 0000000006e931bf [1640542.560323] RDX: 0000000006e931be RSI: 0000400200 RDI: ffff9a45ff004300 [1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09: 0000000000000000 [1640542.561670] : 0000000000000000 R11: 0000000000000000 R12: ffffffff9a20608d [1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15: 696c662f65636976 [1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000) GS:0000000000000000 [1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4: 00000000003606e0 [1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [1640542.5 66069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [1640542.566742] Seguimiento de llamadas: [1640542.567009] anon_vma_clone+0x5d/0x170 2.567417] __split_vma+0x91/0x1a0 [1640542.567777] do_munmap+0x2c6/0x320 [1640542.568128] vm_munmap+0x54/0x70 [1640542.569990] __x64_sys_munmap+0x22/0x30 [1640542.572005] _64+0x5b/0x1b0 [1640542.573724] entrada_SYSCALL_64_after_hwframe+0x44/0xa9 [1640542.575642] RIP: 0033:0x7f45d6e61e27 James Wang lo ha reproducido de forma estable en la \u00faltima versi\u00f3n 4.19 LTS. Despu\u00e9s de algunas depuraciones, finalmente demostramos que se debe al acceso fuera de los l\u00edmites al b\u00fafer ftrace usando una herramienta de depuraci\u00f3n de la siguiente manera: [86.775200] ERROR: Escritura fuera de los l\u00edmites en la direcci\u00f3n 0xffff88aefe8b7000 [86.780806] no_context+0xdf/0x3c0 [86.784327 ] __do_page_fault+0x252/0x470 [ 86.788367] do_page_fault+0x32/0x140 [ 86.792145] page_fault+0x1e/0x30 [ 86.795576] strncpy_from_unsafe+0x66/0xb0 [ 86.799789] ry_string+0x25/0x40 [ 86.804002] fetch_deref_string+0x51/0x60 [ 86.808134] kprobe_trace_func +0x32d/0x3a0 [ 86.812347] kprobe_dispatcher+0x45/0x50 [ 86.816385] kprobe_ftrace_handler+0x90/0xf0 [ 86.820779] ftrace_ops_assist_func+0xa1/0x140 [ 86.825340] ffffc00750bf [ 86.828603] do_sys_open+0x5/0x1f0 [ 86.832124] do_syscall_64+0x5b/0x1b0 [ 86.835900 ] Entry_SYSCALL_64_after_hwframe+0x44/0xa9 commit b220c049d519 (\\\"rastreo: verificar la longitud antes de entregar el b\u00fafer de filtro\\\") agrega verificaci\u00f3n de longitud para proteger el desbordamiento de datos de seguimiento introducido en 0fc1b09ff1ff, parece que esta soluci\u00f3n no puede evitar el desbordamiento por completo, la verificaci\u00f3n de longitud tambi\u00e9n deber\u00eda tenga en cuenta el tama\u00f1o de la entrada-\u0026gt;matriz[0], ya que esta matriz[0] ocupa toda la longitud de los datos de seguimiento y ocupa espacio adicional y corre el riesgo de desbordarse.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.9.258\",\"versionEndExcluding\":\"4.9.273\",\"matchCriteriaId\":\"D73EA9B8-6293-4837-B511-DAD9DBFA5636\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14.222\",\"versionEndExcluding\":\"4.14.237\",\"matchCriteriaId\":\"678E7D52-5CA6-4608-8727-D74ED21A45B5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.177\",\"versionEndExcluding\":\"4.19.195\",\"matchCriteriaId\":\"12CD72A1-696C-421C-AD11-87E6942FC473\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.99\",\"versionEndExcluding\":\"5.4.126\",\"matchCriteriaId\":\"6423589E-DA2E-4EA5-8738-C64751B2DAC9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.17\",\"versionEndExcluding\":\"5.10.44\",\"matchCriteriaId\":\"1A5F40E7-CF49-4CBA-90AF-0CAA330EEC45\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.12.11\",\"matchCriteriaId\":\"F914A757-FAFD-407E-9031-21F66635D5EA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"96AC23B2-D46A-49D9-8203-8E1BEDCA8532\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"DA610E30-717C-4700-9F77-A3C9244F3BFD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"1ECD33F5-85BE-430B-8F86-8D7BD560311D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CF351855-2437-4CF5-AD7C-BDFA51F27683\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2d598902799886d67947406f26ee8e5fd2ca097f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/31ceae385556c37e4d286cb6378696448f566883\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/43c32c22254b9328d7abb1c2b0f689dc67838e60\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b16a249eca2230c2cd66fa1d4b94743bd9b6ef92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d63f00ec908b3be635ead5d6029cc94246e1f38d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/edcce01e0e50840a9aa6a70baed21477bdd2c9f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2d598902799886d67947406f26ee8e5fd2ca097f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/31ceae385556c37e4d286cb6378696448f566883\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/43c32c22254b9328d7abb1c2b0f689dc67838e60\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b16a249eca2230c2cd66fa1d4b94743bd9b6ef92\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d63f00ec908b3be635ead5d6029cc94246e1f38d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/edcce01e0e50840a9aa6a70baed21477bdd2c9f9\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
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\"version\": \"5.12.11\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.13\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.13\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-06T18:21:05.654Z\"}}], \"cna\": {\"title\": \"tracing: Correct the length check which causes memory corruption\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2e584b1a02ee\", \"lessThan\": \"edcce01e0e50\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e46d43375442\", \"lessThan\": \"2d5989027998\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0572fc6a510a\", \"lessThan\": \"31ceae385556\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a0997a86f5c0\", \"lessThan\": \"d63f00ec908b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7c93d8cff582\", \"lessThan\": \"43c32c22254b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b220c049d519\", \"lessThan\": \"b16a249eca22\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b220c049d519\", \"lessThan\": \"3e08a9f9760f\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/trace/trace.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": 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\"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/edcce01e0e50840a9aa6a70baed21477bdd2c9f9\"}, {\"url\": \"https://git.kernel.org/stable/c/2d598902799886d67947406f26ee8e5fd2ca097f\"}, {\"url\": \"https://git.kernel.org/stable/c/31ceae385556c37e4d286cb6378696448f566883\"}, {\"url\": \"https://git.kernel.org/stable/c/d63f00ec908b3be635ead5d6029cc94246e1f38d\"}, {\"url\": \"https://git.kernel.org/stable/c/43c32c22254b9328d7abb1c2b0f689dc67838e60\"}, {\"url\": \"https://git.kernel.org/stable/c/b16a249eca2230c2cd66fa1d4b94743bd9b6ef92\"}, {\"url\": \"https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3\"}], \"x_generator\": {\"engine\": \"bippy-a5840b7849dd\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing: Correct the length check which causes memory corruption\\n\\nWe\u0027ve suffered from severe kernel crashes due to memory corruption on\\nour production environment, like,\\n\\nCall Trace:\\n[1640542.554277] general protection fault: 0000 [#1] SMP PTI\\n[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G\\n[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190\\n[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286\\n[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:\\n0000000006e931bf\\n[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:\\nffff9a45ff004300\\n[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:\\n0000000000000000\\n[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:\\nffffffff9a20608d\\n[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:\\n696c662f65636976\\n[1640542.563128] FS:  00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)\\nknlGS:0000000000000000\\n[1640542.563937] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:\\n00000000003606e0\\n[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\\n0000000000000000\\n[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\\n0000000000000400\\n[1640542.566742] Call Trace:\\n[1640542.567009]  anon_vma_clone+0x5d/0x170\\n[1640542.567417]  __split_vma+0x91/0x1a0\\n[1640542.567777]  do_munmap+0x2c6/0x320\\n[1640542.568128]  vm_munmap+0x54/0x70\\n[1640542.569990]  __x64_sys_munmap+0x22/0x30\\n[1640542.572005]  do_syscall_64+0x5b/0x1b0\\n[1640542.573724]  entry_SYSCALL_64_after_hwframe+0x44/0xa9\\n[1640542.575642] RIP: 0033:0x7f45d6e61e27\\n\\nJames Wang has reproduced it stably on the latest 4.19 LTS.\\nAfter some debugging, we finally proved that it\u0027s due to ftrace\\nbuffer out-of-bound access using a debug tool as follows:\\n[   86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000\\n[   86.780806]  no_context+0xdf/0x3c0\\n[   86.784327]  __do_page_fault+0x252/0x470\\n[   86.788367]  do_page_fault+0x32/0x140\\n[   86.792145]  page_fault+0x1e/0x30\\n[   86.795576]  strncpy_from_unsafe+0x66/0xb0\\n[   86.799789]  fetch_memory_string+0x25/0x40\\n[   86.804002]  fetch_deref_string+0x51/0x60\\n[   86.808134]  kprobe_trace_func+0x32d/0x3a0\\n[   86.812347]  kprobe_dispatcher+0x45/0x50\\n[   86.816385]  kprobe_ftrace_handler+0x90/0xf0\\n[   86.820779]  ftrace_ops_assist_func+0xa1/0x140\\n[   86.825340]  0xffffffffc00750bf\\n[   86.828603]  do_sys_open+0x5/0x1f0\\n[   86.832124]  do_syscall_64+0x5b/0x1b0\\n[   86.835900]  entry_SYSCALL_64_after_hwframe+0x44/0xa9\\n\\ncommit b220c049d519 (\\\"tracing: Check length before giving out\\nthe filter buffer\\\") adds length check to protect trace data\\noverflow introduced in 0fc1b09ff1ff, seems that this fix can\u0027t prevent\\noverflow entirely, the length check should also take the sizeof\\nentry-\u003earray[0] into account, since this array[0] is filled the\\nlength of trace data and occupy addtional space and risk overflow.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-05-29T05:05:05.763Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47274\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T05:32:07.995Z\", \"dateReserved\": \"2024-05-21T13:27:52.127Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:20:02.694Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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