CVE-2022-50078 (GCVE-0-2022-50078)
Vulnerability from cvelistv5
Published
2025-06-18 11:02
Modified
2025-06-18 11:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing/eprobes: Do not allow eprobes to use $stack, or % for regs While playing with event probes (eprobes), I tried to see what would happen if I attempted to retrieve the instruction pointer (%rip) knowing that event probes do not use pt_regs. The result was: BUG: kernel NULL pointer dereference, address: 0000000000000024 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 1847 Comm: trace-cmd Not tainted 5.19.0-rc5-test+ #309 Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03 07/14/2016 RIP: 0010:get_event_field.isra.0+0x0/0x50 Code: ff 48 c7 c7 c0 8f 74 a1 e8 3d 8b f5 ff e8 88 09 f6 ff 4c 89 e7 e8 50 6a 13 00 48 89 ef 5b 5d 41 5c 41 5d e9 42 6a 13 00 66 90 <48> 63 47 24 8b 57 2c 48 01 c6 8b 47 28 83 f8 02 74 0e 83 f8 04 74 RSP: 0018:ffff916c394bbaf0 EFLAGS: 00010086 RAX: ffff916c854041d8 RBX: ffff916c8d9fbf50 RCX: ffff916c255d2000 RDX: 0000000000000000 RSI: ffff916c255d2008 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff916c3a2a0c08 R09: ffff916c394bbda8 R10: 0000000000000000 R11: 0000000000000000 R12: ffff916c854041d8 R13: ffff916c854041b0 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff916c9ea40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000024 CR3: 000000011b60a002 CR4: 00000000001706e0 Call Trace: <TASK> get_eprobe_size+0xb4/0x640 ? __mod_node_page_state+0x72/0xc0 __eprobe_trace_func+0x59/0x1a0 ? __mod_lruvec_page_state+0xaa/0x1b0 ? page_remove_file_rmap+0x14/0x230 ? page_remove_rmap+0xda/0x170 event_triggers_call+0x52/0xe0 trace_event_buffer_commit+0x18f/0x240 trace_event_raw_event_sched_wakeup_template+0x7a/0xb0 try_to_wake_up+0x260/0x4c0 __wake_up_common+0x80/0x180 __wake_up_common_lock+0x7c/0xc0 do_notify_parent+0x1c9/0x2a0 exit_notify+0x1a9/0x220 do_exit+0x2ba/0x450 do_group_exit+0x2d/0x90 __x64_sys_exit_group+0x14/0x20 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Obviously this is not the desired result. Move the testing for TPARG_FL_TPOINT which is only used for event probes to the top of the "$" variable check, as all the other variables are not used for event probes. Also add a check in the register parsing "%" to fail if an event probe is used.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7491e2c442781a1860181adb5ab472a52075f393
Version: 7491e2c442781a1860181adb5ab472a52075f393
Version: 7491e2c442781a1860181adb5ab472a52075f393
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_probe.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ba53c21ce9773743b8e0a8ada048c96ff2d55c67",
              "status": "affected",
              "version": "7491e2c442781a1860181adb5ab472a52075f393",
              "versionType": "git"
            },
            {
              "lessThan": "7c262114a576d94c0ced80e232bbb17391a55908",
              "status": "affected",
              "version": "7491e2c442781a1860181adb5ab472a52075f393",
              "versionType": "git"
            },
            {
              "lessThan": "2673c60ee67e71f2ebe34386e62d348f71edee47",
              "status": "affected",
              "version": "7491e2c442781a1860181adb5ab472a52075f393",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_probe.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.63",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.63",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.4",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/eprobes: Do not allow eprobes to use $stack, or % for regs\n\nWhile playing with event probes (eprobes), I tried to see what would\nhappen if I attempted to retrieve the instruction pointer (%rip) knowing\nthat event probes do not use pt_regs. The result was:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000024\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 1847 Comm: trace-cmd Not tainted 5.19.0-rc5-test+ #309\n Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01\nv03.03 07/14/2016\n RIP: 0010:get_event_field.isra.0+0x0/0x50\n Code: ff 48 c7 c7 c0 8f 74 a1 e8 3d 8b f5 ff e8 88 09 f6 ff 4c 89 e7 e8\n50 6a 13 00 48 89 ef 5b 5d 41 5c 41 5d e9 42 6a 13 00 66 90 \u003c48\u003e 63 47 24\n8b 57 2c 48 01 c6 8b 47 28 83 f8 02 74 0e 83 f8 04 74\n RSP: 0018:ffff916c394bbaf0 EFLAGS: 00010086\n RAX: ffff916c854041d8 RBX: ffff916c8d9fbf50 RCX: ffff916c255d2000\n RDX: 0000000000000000 RSI: ffff916c255d2008 RDI: 0000000000000000\n RBP: 0000000000000000 R08: ffff916c3a2a0c08 R09: ffff916c394bbda8\n R10: 0000000000000000 R11: 0000000000000000 R12: ffff916c854041d8\n R13: ffff916c854041b0 R14: 0000000000000000 R15: 0000000000000000\n FS:  0000000000000000(0000) GS:ffff916c9ea40000(0000)\nknlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000024 CR3: 000000011b60a002 CR4: 00000000001706e0\n Call Trace:\n  \u003cTASK\u003e\n  get_eprobe_size+0xb4/0x640\n  ? __mod_node_page_state+0x72/0xc0\n  __eprobe_trace_func+0x59/0x1a0\n  ? __mod_lruvec_page_state+0xaa/0x1b0\n  ? page_remove_file_rmap+0x14/0x230\n  ? page_remove_rmap+0xda/0x170\n  event_triggers_call+0x52/0xe0\n  trace_event_buffer_commit+0x18f/0x240\n  trace_event_raw_event_sched_wakeup_template+0x7a/0xb0\n  try_to_wake_up+0x260/0x4c0\n  __wake_up_common+0x80/0x180\n  __wake_up_common_lock+0x7c/0xc0\n  do_notify_parent+0x1c9/0x2a0\n  exit_notify+0x1a9/0x220\n  do_exit+0x2ba/0x450\n  do_group_exit+0x2d/0x90\n  __x64_sys_exit_group+0x14/0x20\n  do_syscall_64+0x3b/0x90\n  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nObviously this is not the desired result.\n\nMove the testing for TPARG_FL_TPOINT which is only used for event probes\nto the top of the \"$\" variable check, as all the other variables are not\nused for event probes. Also add a check in the register parsing \"%\" to\nfail if an event probe is used."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:02:21.119Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ba53c21ce9773743b8e0a8ada048c96ff2d55c67"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c262114a576d94c0ced80e232bbb17391a55908"
        },
        {
          "url": "https://git.kernel.org/stable/c/2673c60ee67e71f2ebe34386e62d348f71edee47"
        }
      ],
      "title": "tracing/eprobes: Do not allow eprobes to use $stack, or % for regs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50078",
    "datePublished": "2025-06-18T11:02:21.119Z",
    "dateReserved": "2025-06-18T10:57:27.408Z",
    "dateUpdated": "2025-06-18T11:02:21.119Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50078\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:36.753\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing/eprobes: Do not allow eprobes to use $stack, or % for regs\\n\\nWhile playing with event probes (eprobes), I tried to see what would\\nhappen if I attempted to retrieve the instruction pointer (%rip) knowing\\nthat event probes do not use pt_regs. The result was:\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000024\\n #PF: supervisor read access in kernel mode\\n #PF: error_code(0x0000) - not-present page\\n PGD 0 P4D 0\\n Oops: 0000 [#1] PREEMPT SMP PTI\\n CPU: 1 PID: 1847 Comm: trace-cmd Not tainted 5.19.0-rc5-test+ #309\\n Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01\\nv03.03 07/14/2016\\n RIP: 0010:get_event_field.isra.0+0x0/0x50\\n Code: ff 48 c7 c7 c0 8f 74 a1 e8 3d 8b f5 ff e8 88 09 f6 ff 4c 89 e7 e8\\n50 6a 13 00 48 89 ef 5b 5d 41 5c 41 5d e9 42 6a 13 00 66 90 \u003c48\u003e 63 47 24\\n8b 57 2c 48 01 c6 8b 47 28 83 f8 02 74 0e 83 f8 04 74\\n RSP: 0018:ffff916c394bbaf0 EFLAGS: 00010086\\n RAX: ffff916c854041d8 RBX: ffff916c8d9fbf50 RCX: ffff916c255d2000\\n RDX: 0000000000000000 RSI: ffff916c255d2008 RDI: 0000000000000000\\n RBP: 0000000000000000 R08: ffff916c3a2a0c08 R09: ffff916c394bbda8\\n R10: 0000000000000000 R11: 0000000000000000 R12: ffff916c854041d8\\n R13: ffff916c854041b0 R14: 0000000000000000 R15: 0000000000000000\\n FS:  0000000000000000(0000) GS:ffff916c9ea40000(0000)\\nknlGS:0000000000000000\\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 0000000000000024 CR3: 000000011b60a002 CR4: 00000000001706e0\\n Call Trace:\\n  \u003cTASK\u003e\\n  get_eprobe_size+0xb4/0x640\\n  ? __mod_node_page_state+0x72/0xc0\\n  __eprobe_trace_func+0x59/0x1a0\\n  ? __mod_lruvec_page_state+0xaa/0x1b0\\n  ? page_remove_file_rmap+0x14/0x230\\n  ? page_remove_rmap+0xda/0x170\\n  event_triggers_call+0x52/0xe0\\n  trace_event_buffer_commit+0x18f/0x240\\n  trace_event_raw_event_sched_wakeup_template+0x7a/0xb0\\n  try_to_wake_up+0x260/0x4c0\\n  __wake_up_common+0x80/0x180\\n  __wake_up_common_lock+0x7c/0xc0\\n  do_notify_parent+0x1c9/0x2a0\\n  exit_notify+0x1a9/0x220\\n  do_exit+0x2ba/0x450\\n  do_group_exit+0x2d/0x90\\n  __x64_sys_exit_group+0x14/0x20\\n  do_syscall_64+0x3b/0x90\\n  entry_SYSCALL_64_after_hwframe+0x46/0xb0\\n\\nObviously this is not the desired result.\\n\\nMove the testing for TPARG_FL_TPOINT which is only used for event probes\\nto the top of the \\\"$\\\" variable check, as all the other variables are not\\nused for event probes. Also add a check in the register parsing \\\"%\\\" to\\nfail if an event probe is used.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tracing/eprobes: No permitir que las eprobes usen $stack o % para regs. Mientras jugaba con las sondas de eventos (eprobes), intent\u00e9 ver qu\u00e9 suceder\u00eda si intentaba recuperar el puntero de instrucciones (%rip) sabiendo que las sondas de eventos no usan pt_regs. El resultado fue: ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000024 #PF: acceso de lectura del supervisor en modo kernel #PF: error_code(0x0000) - p\u00e1gina no presente PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 1847 Comm: trace-cmd No contaminado 5.19.0-rc5-test+ #309 Nombre del hardware: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03 14/07/2016 RIP: 0010:get_event_field.isra.0+0x0/0x50 C\u00f3digo: ff 48 c7 c7 c0 8f 74 a1 e8 3d 8b f5 ff e8 88 09 f6 ff 4c 89 e7 e8 50 6a 13 00 48 89 ef 5b 5d 41 5c 41 5d e9 42 6a 13 00 66 90 \u0026lt;48\u0026gt; 63 47 24 8b 57 2c 48 01 c6 8b 47 28 83 f8 02 74 0e 83 f8 04 74 RSP: 0018:ffff916c394bbaf0 EFLAGS: 00010086 RAX: ffff916c854041d8 RBX: ffff916c8d9fbf50 RCX: ffff916c255d2000 RDX: 0000000000000000 RSI: ffff916c255d2008 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff916c3a2a0c08 R09: ffff916c394bbda8 R10: 0000000000000000 R11: 0000000000000000 R12: ffff916c854041d8 R13: ffff916c854041b0 R14: 000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff916c9ea40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000024 CR3: 000000011b60a002 CR4: 00000000001706e0 Seguimiento de llamadas:  get_eprobe_size+0xb4/0x640 ? __mod_node_page_state+0x72/0xc0 __eprobe_trace_func+0x59/0x1a0 ? __mod_lruvec_page_state+0xaa/0x1b0 ? page_remove_file_rmap+0x14/0x230 ? page_remove_rmap+0xda/0x170 event_triggers_call+0x52/0xe0 trace_event_buffer_commit+0x18f/0x240 trace_event_raw_event_sched_wakeup_template+0x7a/0xb0 try_to_wakeup+0x260/0x4c0 __wake_up_common+0x80/0x180 __wake_up_common_lock+0x7c/0xc0 do_notify_parent+0x1c9/0x2a0 exit_notify+0x1a9/0x220 do_exit+0x2ba/0x450 do_group_exit+0x2d/0x90 __x64_sys_exit_group+0x14/0x20 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Obviamente, este no es el resultado deseado. Mueva la prueba de TPARG_FL_TPOINT, que solo se usa para sondeos de eventos, al principio de la comprobaci\u00f3n de la variable \\\"$\\\", ya que las dem\u00e1s variables no se usan para sondeos de eventos. Tambi\u00e9n a\u00f1ada una comprobaci\u00f3n en el registro que analiza \\\"%\\\" para que falle si se usa un sondeo de eventos.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2673c60ee67e71f2ebe34386e62d348f71edee47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c262114a576d94c0ced80e232bbb17391a55908\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ba53c21ce9773743b8e0a8ada048c96ff2d55c67\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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