fkie_cve-2021-47238
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2025-04-04 14:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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-8c081fb06d67https://git.kernel.org/stable/c/0dc13e75507faa17ac9f7562b4ef7bf8fcd78422Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1e28018b5c83d5073f74a6fb72eabe8370b2f501Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3dd2aeac2e9624cff9fa634710837e4f2e352758Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6cff57eea3347f79f1867cc53e1093b6614138d8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77de6ee73f54a9a89c0afa0bf4c53b239aa9953aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ac31cc837cafb57a271babad8ccffbf733caa076Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d8e2973029b8b2ce477b564824431f3385c77083Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0dc13e75507faa17ac9f7562b4ef7bf8fcd78422Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1e28018b5c83d5073f74a6fb72eabe8370b2f501Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3dd2aeac2e9624cff9fa634710837e4f2e352758Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6cff57eea3347f79f1867cc53e1093b6614138d8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/77de6ee73f54a9a89c0afa0bf4c53b239aa9953aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ac31cc837cafb57a271babad8ccffbf733caa076Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d8e2973029b8b2ce477b564824431f3385c77083Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13


To clipboard 

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  "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 ."
    }
  ],
  "id": "CVE-2021-47238",
  "lastModified": "2025-04-04T14:31:03.253",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2024-05-21T15:15:13.017",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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