CVE-2021-47238 (GCVE-0-2021-47238)
Vulnerability from cvelistv5
Published
2024-05-21 14:19
Modified
2025-05-07 19:58
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ipv4: fix memory leak in ip_mc_add1_src BUG: memory leak unreferenced object 0xffff888101bc4c00 (size 32): comm "syz-executor527", pid 360, jiffies 4294807421 (age 19.329s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01 00 00 00 00 00 00 00 ac 14 14 bb 00 00 02 00 ................ backtrace: [<00000000f17c5244>] kmalloc include/linux/slab.h:558 [inline] [<00000000f17c5244>] kzalloc include/linux/slab.h:688 [inline] [<00000000f17c5244>] ip_mc_add1_src net/ipv4/igmp.c:1971 [inline] [<00000000f17c5244>] ip_mc_add_src+0x95f/0xdb0 net/ipv4/igmp.c:2095 [<000000001cb99709>] ip_mc_source+0x84c/0xea0 net/ipv4/igmp.c:2416 [<0000000052cf19ed>] do_ip_setsockopt net/ipv4/ip_sockglue.c:1294 [inline] [<0000000052cf19ed>] ip_setsockopt+0x114b/0x30c0 net/ipv4/ip_sockglue.c:1423 [<00000000477edfbc>] raw_setsockopt+0x13d/0x170 net/ipv4/raw.c:857 [<00000000e75ca9bb>] __sys_setsockopt+0x158/0x270 net/socket.c:2117 [<00000000bdb993a8>] __do_sys_setsockopt net/socket.c:2128 [inline] [<00000000bdb993a8>] __se_sys_setsockopt net/socket.c:2125 [inline] [<00000000bdb993a8>] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2125 [<000000006a1ffdbd>] do_syscall_64+0x40/0x80 arch/x86/entry/common.c:47 [<00000000b11467c4>] entry_SYSCALL_64_after_hwframe+0x44/0xae In commit 24803f38a5c0 ("igmp: do not remove igmp souce list info when set link down"), the ip_mc_clear_src() in ip_mc_destroy_dev() was removed, because it was also called in igmpv3_clear_delrec(). Rough callgraph: inetdev_destroy -> ip_mc_destroy_dev -> igmpv3_clear_delrec -> ip_mc_clear_src -> RCU_INIT_POINTER(dev->ip_ptr, NULL) However, ip_mc_clear_src() called in igmpv3_clear_delrec() doesn't release in_dev->mc_list->sources. And RCU_INIT_POINTER() assigns the NULL to dev->ip_ptr. As a result, in_dev cannot be obtained through inetdev_by_index() and then in_dev->mc_list->sources cannot be released by ip_mc_del1_src() in the sock_close. Rough call sequence goes like: sock_close -> __sock_release -> inet_release -> ip_mc_drop_socket -> inetdev_by_index -> ip_mc_leave_src -> ip_mc_del_src -> ip_mc_del1_src So we still need to call ip_mc_clear_src() in ip_mc_destroy_dev() to free in_dev->mc_list->sources.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/0dc13e75507faa17ac9f7562b4ef7bf8fcd78422 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/1e28018b5c83d5073f74a6fb72eabe8370b2f501 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/3dd2aeac2e9624cff9fa634710837e4f2e352758 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/6cff57eea3347f79f1867cc53e1093b6614138d8 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/77de6ee73f54a9a89c0afa0bf4c53b239aa9953a Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/ac31cc837cafb57a271babad8ccffbf733caa076 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/d8e2973029b8b2ce477b564824431f3385c77083 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/0dc13e75507faa17ac9f7562b4ef7bf8fcd78422 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/1e28018b5c83d5073f74a6fb72eabe8370b2f501 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/3dd2aeac2e9624cff9fa634710837e4f2e352758 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/6cff57eea3347f79f1867cc53e1093b6614138d8 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/77de6ee73f54a9a89c0afa0bf4c53b239aa9953a Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/ac31cc837cafb57a271babad8ccffbf733caa076 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/d8e2973029b8b2ce477b564824431f3385c77083 Patch
Impacted products
Vendor Product Version
Linux Linux Version: 24803f38a5c0b6c57ed800b47e695f9ce474bc3a
Version: 24803f38a5c0b6c57ed800b47e695f9ce474bc3a
Version: 24803f38a5c0b6c57ed800b47e695f9ce474bc3a
Version: 24803f38a5c0b6c57ed800b47e695f9ce474bc3a
Version: 24803f38a5c0b6c57ed800b47e695f9ce474bc3a
Version: 24803f38a5c0b6c57ed800b47e695f9ce474bc3a
Version: 24803f38a5c0b6c57ed800b47e695f9ce474bc3a
Version: bd1b664a19403ede448d29c87b2f23796bc7a577
Version: b38c6e0bd5b5e439ecebdc0df599d573c2f610f8
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv4: fix memory leak in ip_mc_add1_src\n\nBUG: memory leak\nunreferenced object 0xffff888101bc4c00 (size 32):\n  comm \"syz-executor527\", pid 360, jiffies 4294807421 (age 19.329s)\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n    01 00 00 00 00 00 00 00 ac 14 14 bb 00 00 02 00 ................\n  backtrace:\n    [\u003c00000000f17c5244\u003e] kmalloc include/linux/slab.h:558 [inline]\n    [\u003c00000000f17c5244\u003e] kzalloc include/linux/slab.h:688 [inline]\n    [\u003c00000000f17c5244\u003e] ip_mc_add1_src net/ipv4/igmp.c:1971 [inline]\n    [\u003c00000000f17c5244\u003e] ip_mc_add_src+0x95f/0xdb0 net/ipv4/igmp.c:2095\n    [\u003c000000001cb99709\u003e] ip_mc_source+0x84c/0xea0 net/ipv4/igmp.c:2416\n    [\u003c0000000052cf19ed\u003e] do_ip_setsockopt net/ipv4/ip_sockglue.c:1294 [inline]\n    [\u003c0000000052cf19ed\u003e] ip_setsockopt+0x114b/0x30c0 net/ipv4/ip_sockglue.c:1423\n    [\u003c00000000477edfbc\u003e] raw_setsockopt+0x13d/0x170 net/ipv4/raw.c:857\n    [\u003c00000000e75ca9bb\u003e] __sys_setsockopt+0x158/0x270 net/socket.c:2117\n    [\u003c00000000bdb993a8\u003e] __do_sys_setsockopt net/socket.c:2128 [inline]\n    [\u003c00000000bdb993a8\u003e] __se_sys_setsockopt net/socket.c:2125 [inline]\n    [\u003c00000000bdb993a8\u003e] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2125\n    [\u003c000000006a1ffdbd\u003e] do_syscall_64+0x40/0x80 arch/x86/entry/common.c:47\n    [\u003c00000000b11467c4\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nIn commit 24803f38a5c0 (\"igmp: do not remove igmp souce list info when set\nlink down\"), the ip_mc_clear_src() in ip_mc_destroy_dev() was removed,\nbecause it was also called in igmpv3_clear_delrec().\n\nRough callgraph:\n\ninetdev_destroy\n-\u003e ip_mc_destroy_dev\n     -\u003e igmpv3_clear_delrec\n        -\u003e ip_mc_clear_src\n-\u003e RCU_INIT_POINTER(dev-\u003eip_ptr, NULL)\n\nHowever, ip_mc_clear_src() called in igmpv3_clear_delrec() doesn\u0027t\nrelease in_dev-\u003emc_list-\u003esources. And RCU_INIT_POINTER() assigns the\nNULL to dev-\u003eip_ptr. As a result, in_dev cannot be obtained through\ninetdev_by_index() and then in_dev-\u003emc_list-\u003esources cannot be released\nby ip_mc_del1_src() in the sock_close. Rough call sequence goes like:\n\nsock_close\n-\u003e __sock_release\n   -\u003e inet_release\n      -\u003e ip_mc_drop_socket\n         -\u003e inetdev_by_index\n         -\u003e ip_mc_leave_src\n            -\u003e ip_mc_del_src\n               -\u003e ip_mc_del1_src\n\nSo we still need to call ip_mc_clear_src() in ip_mc_destroy_dev() to free\nin_dev-\u003emc_list-\u003esources."
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      "providerMetadata": {
        "dateUpdated": "2025-05-04T12:41:17.545Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0dc13e75507faa17ac9f7562b4ef7bf8fcd78422"
        },
        {
          "url": "https://git.kernel.org/stable/c/6cff57eea3347f79f1867cc53e1093b6614138d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/1e28018b5c83d5073f74a6fb72eabe8370b2f501"
        },
        {
          "url": "https://git.kernel.org/stable/c/3dd2aeac2e9624cff9fa634710837e4f2e352758"
        },
        {
          "url": "https://git.kernel.org/stable/c/ac31cc837cafb57a271babad8ccffbf733caa076"
        },
        {
          "url": "https://git.kernel.org/stable/c/77de6ee73f54a9a89c0afa0bf4c53b239aa9953a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8e2973029b8b2ce477b564824431f3385c77083"
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      ],
      "title": "net: ipv4: fix memory leak in ip_mc_add1_src",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47238",
    "datePublished": "2024-05-21T14:19:39.041Z",
    "dateReserved": "2024-04-10T18:59:19.532Z",
    "dateUpdated": "2025-05-07T19:58:16.834Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47238\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:13.017\",\"lastModified\":\"2025-04-04T14:31:03.253\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: ipv4: fix memory leak in ip_mc_add1_src\\n\\nBUG: memory leak\\nunreferenced object 0xffff888101bc4c00 (size 32):\\n  comm \\\"syz-executor527\\\", pid 360, jiffies 4294807421 (age 19.329s)\\n  hex dump (first 32 bytes):\\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\\n    01 00 00 00 00 00 00 00 ac 14 14 bb 00 00 02 00 ................\\n  backtrace:\\n    [\u003c00000000f17c5244\u003e] kmalloc include/linux/slab.h:558 [inline]\\n    [\u003c00000000f17c5244\u003e] kzalloc include/linux/slab.h:688 [inline]\\n    [\u003c00000000f17c5244\u003e] ip_mc_add1_src net/ipv4/igmp.c:1971 [inline]\\n    [\u003c00000000f17c5244\u003e] ip_mc_add_src+0x95f/0xdb0 net/ipv4/igmp.c:2095\\n    [\u003c000000001cb99709\u003e] ip_mc_source+0x84c/0xea0 net/ipv4/igmp.c:2416\\n    [\u003c0000000052cf19ed\u003e] do_ip_setsockopt net/ipv4/ip_sockglue.c:1294 [inline]\\n    [\u003c0000000052cf19ed\u003e] ip_setsockopt+0x114b/0x30c0 net/ipv4/ip_sockglue.c:1423\\n    [\u003c00000000477edfbc\u003e] raw_setsockopt+0x13d/0x170 net/ipv4/raw.c:857\\n    [\u003c00000000e75ca9bb\u003e] __sys_setsockopt+0x158/0x270 net/socket.c:2117\\n    [\u003c00000000bdb993a8\u003e] __do_sys_setsockopt net/socket.c:2128 [inline]\\n    [\u003c00000000bdb993a8\u003e] __se_sys_setsockopt net/socket.c:2125 [inline]\\n    [\u003c00000000bdb993a8\u003e] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2125\\n    [\u003c000000006a1ffdbd\u003e] do_syscall_64+0x40/0x80 arch/x86/entry/common.c:47\\n    [\u003c00000000b11467c4\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae\\n\\nIn commit 24803f38a5c0 (\\\"igmp: do not remove igmp souce list info when set\\nlink down\\\"), the ip_mc_clear_src() in ip_mc_destroy_dev() was removed,\\nbecause it was also called in igmpv3_clear_delrec().\\n\\nRough callgraph:\\n\\ninetdev_destroy\\n-\u003e ip_mc_destroy_dev\\n     -\u003e igmpv3_clear_delrec\\n        -\u003e ip_mc_clear_src\\n-\u003e RCU_INIT_POINTER(dev-\u003eip_ptr, NULL)\\n\\nHowever, ip_mc_clear_src() called in igmpv3_clear_delrec() doesn\u0027t\\nrelease in_dev-\u003emc_list-\u003esources. And RCU_INIT_POINTER() assigns the\\nNULL to dev-\u003eip_ptr. As a result, in_dev cannot be obtained through\\ninetdev_by_index() and then in_dev-\u003emc_list-\u003esources cannot be released\\nby ip_mc_del1_src() in the sock_close. Rough call sequence goes like:\\n\\nsock_close\\n-\u003e __sock_release\\n   -\u003e inet_release\\n      -\u003e ip_mc_drop_socket\\n         -\u003e inetdev_by_index\\n         -\u003e ip_mc_leave_src\\n            -\u003e ip_mc_del_src\\n               -\u003e ip_mc_del1_src\\n\\nSo we still need to call ip_mc_clear_src() in ip_mc_destroy_dev() to free\\nin_dev-\u003emc_list-\u003esources.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ipv4: corrige la p\u00e9rdida de memoria en ip_mc_add1_src. BUG: p\u00e9rdida de memoria objeto sin referencia 0xffff888101bc4c00 (tama\u00f1o 32): comm \\\"syz-executor527\\\", pid 360, jiffies 4294807421 (edad 19.329s) volcado hexadecimal (primeros 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01 00 00 00 00 00 00 00 ac 14 14 bb 00 00 02 00 ................ backtrace: [\u0026lt;00000000f17c5244\u0026gt;] kmalloc include/linux/slab.h:558 [en l\u00ednea] [\u0026lt;00000000f17c5244\u0026gt;] kzalloc include/ linux/slab.h:688 [en l\u00ednea] [\u0026lt;00000000f17c5244\u0026gt;] ip_mc_add1_src net/ipv4/igmp.c:1971 [en l\u00ednea] [\u0026lt;00000000f17c5244\u0026gt;] ip_mc_add_src+0x95f/0xdb0 net/ipv4/igmp.c:2095 \u0026lt;000000001cb99709 \u0026gt;] ip_mc_source+0x84c/0xea0 net/ipv4/igmp.c:2416 [\u0026lt;0000000052cf19ed\u0026gt;] do_ip_setsockopt net/ipv4/ip_sockglue.c:1294 [en l\u00ednea] [\u0026lt;0000000052cf19ed\u0026gt;] 0net/ipv4/ip_sockglue. c:1423 [\u0026lt;00000000477edfbc\u0026gt;] raw_setsockopt+0x13d/0x170 net/ipv4/raw.c:857 [\u0026lt;00000000e75ca9bb\u0026gt;] __sys_setsockopt+0x158/0x270 net/socket.c:2117 [\u0026lt;00000000bdb993 a8\u0026gt;] __do_sys_setsockopt net/socket.c :2128 [en l\u00ednea] [\u0026lt;00000000bdb993a8\u0026gt;] __se_sys_setsockopt net/socket.c:2125 [en l\u00ednea] [\u0026lt;00000000bdb993a8\u0026gt;] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2125 [\u0026lt;000000006a 1ffdbd\u0026gt;] do_syscall_64+0x40/0x80 arch/ x86/entry/common.c:47 [\u0026lt;00000000b11467c4\u0026gt;] Entry_SYSCALL_64_after_hwframe+0x44/0xae En la confirmaci\u00f3n 24803f38a5c0 (\\\"igmp: no eliminar la informaci\u00f3n de la lista de fuentes de igmp cuando se establece el enlace\\\"), se elimin\u00f3 ip_mc_clear_src() en ip_mc_destroy_dev() , porque tambi\u00e9n fue llamado en igmpv3_clear_delrec(). Gr\u00e1fico de llamada aproximado: inetdev_destroy -\u0026gt; ip_mc_destroy_dev -\u0026gt; igmpv3_clear_delrec -\u0026gt; ip_mc_clear_src -\u0026gt; RCU_INIT_POINTER(dev-\u0026gt;ip_ptr, NULL) Sin embargo, ip_mc_clear_src() llamado en igmpv3_clear_delrec() no libera in_dev-\u0026gt;mc_list-\u0026gt;sources. Y RCU_INIT_POINTER() asigna NULL a dev-\u0026gt;ip_ptr. Como resultado, in_dev no se puede obtener a trav\u00e9s de inetdev_by_index() y luego in_dev-\u0026gt;mc_list-\u0026gt;sources no se puede liberar mediante ip_mc_del1_src() en sock_close. La secuencia de llamada aproximada es as\u00ed: sock_close -\u0026gt; __sock_release -\u0026gt; inet_release -\u0026gt; ip_mc_drop_socket -\u0026gt; inetdev_by_index -\u0026gt; ip_mc_leave_src -\u0026gt; ip_mc_del_src -\u0026gt; ip_mc_del1_src Entonces todav\u00eda necesitamos llamar a ip_mc_clear_src() en ip_mc_destroy_dev() para liberar in_dev-\u0026gt;mc_list -\u0026gt;fuentes .\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-400\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.2.87\",\"versionEndExcluding\":\"3.3\",\"matchCriteriaId\":\"EDF220AE-D4D3-4C0B-BFCA-4DDB897A81FA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.16.42\",\"versionEndExcluding\":\"3.17\",\"matchCriteriaId\":\"776A78BD-F513-4084-AC1D-66E45A675E72\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.9\",\"versionEndExcluding\":\"4.9.274\",\"matchCriteriaId\":\"6B5A1555-2CC4-4652-AD96-3529D26B3447\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10\",\"versionEndExcluding\":\"4.14.238\",\"matchCriteriaId\":\"C3C0DBBF-0923-4D2A-9178-134691F9933F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.196\",\"matchCriteriaId\":\"F3CAB837-7D38-4934-AD4F-195CEFD754E6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.128\",\"matchCriteriaId\":\"6267BD4E-BE25-48B5-B850-4B493440DAFA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.46\",\"matchCriteriaId\":\"59455D13-A902-42E1-97F7-5ED579777193\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.12.13\",\"matchCriteriaId\":\"7806E7E5-6D4F-4E18-81C1-79B3C60EE855\"},{\"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\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"25A855BA-2118-44F2-90EF-EBBB12AF51EF\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0dc13e75507faa17ac9f7562b4ef7bf8fcd78422\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1e28018b5c83d5073f74a6fb72eabe8370b2f501\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3dd2aeac2e9624cff9fa634710837e4f2e352758\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6cff57eea3347f79f1867cc53e1093b6614138d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/77de6ee73f54a9a89c0afa0bf4c53b239aa9953a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ac31cc837cafb57a271babad8ccffbf733caa076\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d8e2973029b8b2ce477b564824431f3385c77083\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0dc13e75507faa17ac9f7562b4ef7bf8fcd78422\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1e28018b5c83d5073f74a6fb72eabe8370b2f501\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3dd2aeac2e9624cff9fa634710837e4f2e352758\",\"source\":\"af854a3a-2127-422b-91ae-364da2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\"version\": \"4.19.196\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.128\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.46\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/igmp.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/0dc13e75507faa17ac9f7562b4ef7bf8fcd78422\"}, {\"url\": \"https://git.kernel.org/stable/c/6cff57eea3347f79f1867cc53e1093b6614138d8\"}, {\"url\": \"https://git.kernel.org/stable/c/1e28018b5c83d5073f74a6fb72eabe8370b2f501\"}, {\"url\": \"https://git.kernel.org/stable/c/3dd2aeac2e9624cff9fa634710837e4f2e352758\"}, {\"url\": \"https://git.kernel.org/stable/c/ac31cc837cafb57a271babad8ccffbf733caa076\"}, {\"url\": \"https://git.kernel.org/stable/c/77de6ee73f54a9a89c0afa0bf4c53b239aa9953a\"}, {\"url\": \"https://git.kernel.org/stable/c/d8e2973029b8b2ce477b564824431f3385c77083\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: ipv4: fix memory leak in ip_mc_add1_src\\n\\nBUG: memory leak\\nunreferenced object 0xffff888101bc4c00 (size 32):\\n  comm \\\"syz-executor527\\\", pid 360, jiffies 4294807421 (age 19.329s)\\n  hex dump (first 32 bytes):\\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\\n    01 00 00 00 00 00 00 00 ac 14 14 bb 00 00 02 00 ................\\n  backtrace:\\n    [\u003c00000000f17c5244\u003e] kmalloc include/linux/slab.h:558 [inline]\\n    [\u003c00000000f17c5244\u003e] kzalloc include/linux/slab.h:688 [inline]\\n    [\u003c00000000f17c5244\u003e] ip_mc_add1_src net/ipv4/igmp.c:1971 [inline]\\n    [\u003c00000000f17c5244\u003e] ip_mc_add_src+0x95f/0xdb0 net/ipv4/igmp.c:2095\\n    [\u003c000000001cb99709\u003e] ip_mc_source+0x84c/0xea0 net/ipv4/igmp.c:2416\\n    [\u003c0000000052cf19ed\u003e] do_ip_setsockopt net/ipv4/ip_sockglue.c:1294 [inline]\\n    [\u003c0000000052cf19ed\u003e] ip_setsockopt+0x114b/0x30c0 net/ipv4/ip_sockglue.c:1423\\n    [\u003c00000000477edfbc\u003e] raw_setsockopt+0x13d/0x170 net/ipv4/raw.c:857\\n    [\u003c00000000e75ca9bb\u003e] __sys_setsockopt+0x158/0x270 net/socket.c:2117\\n    [\u003c00000000bdb993a8\u003e] __do_sys_setsockopt net/socket.c:2128 [inline]\\n    [\u003c00000000bdb993a8\u003e] __se_sys_setsockopt net/socket.c:2125 [inline]\\n    [\u003c00000000bdb993a8\u003e] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2125\\n    [\u003c000000006a1ffdbd\u003e] do_syscall_64+0x40/0x80 arch/x86/entry/common.c:47\\n    [\u003c00000000b11467c4\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae\\n\\nIn commit 24803f38a5c0 (\\\"igmp: do not remove igmp souce list info when set\\nlink down\\\"), the ip_mc_clear_src() in ip_mc_destroy_dev() was removed,\\nbecause it was also called in igmpv3_clear_delrec().\\n\\nRough callgraph:\\n\\ninetdev_destroy\\n-\u003e ip_mc_destroy_dev\\n     -\u003e igmpv3_clear_delrec\\n        -\u003e ip_mc_clear_src\\n-\u003e RCU_INIT_POINTER(dev-\u003eip_ptr, NULL)\\n\\nHowever, ip_mc_clear_src() called in igmpv3_clear_delrec() doesn\u0027t\\nrelease in_dev-\u003emc_list-\u003esources. And RCU_INIT_POINTER() assigns the\\nNULL to dev-\u003eip_ptr. As a result, in_dev cannot be obtained through\\ninetdev_by_index() and then in_dev-\u003emc_list-\u003esources cannot be released\\nby ip_mc_del1_src() in the sock_close. Rough call sequence goes like:\\n\\nsock_close\\n-\u003e __sock_release\\n   -\u003e inet_release\\n      -\u003e ip_mc_drop_socket\\n         -\u003e inetdev_by_index\\n         -\u003e ip_mc_leave_src\\n            -\u003e ip_mc_del_src\\n               -\u003e ip_mc_del1_src\\n\\nSo we still need to call ip_mc_clear_src() in ip_mc_destroy_dev() to free\\nin_dev-\u003emc_list-\u003esources.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.274\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.238\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.196\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.128\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.46\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.13\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.2.87\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.16.42\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:41:17.545Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47238\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:41:17.545Z\", \"dateReserved\": \"2024-04-10T18:59:19.532Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:19:39.041Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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