FKIE_CVE-2023-54112

Vulnerability from fkie_nvd - Published: 2025-12-24 13:16 - Updated: 2026-06-17 06:46
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: kcm: Fix memory leak in error path of kcm_sendmsg() syzbot reported a memory leak like below: BUG: memory leak unreferenced object 0xffff88810b088c00 (size 240): comm "syz-executor186", pid 5012, jiffies 4294943306 (age 13.680s) hex dump (first 32 bytes): 00 89 08 0b 81 88 ff ff 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff83e5d5ff>] __alloc_skb+0x1ef/0x230 net/core/skbuff.c:634 [<ffffffff84606e59>] alloc_skb include/linux/skbuff.h:1289 [inline] [<ffffffff84606e59>] kcm_sendmsg+0x269/0x1050 net/kcm/kcmsock.c:815 [<ffffffff83e479c6>] sock_sendmsg_nosec net/socket.c:725 [inline] [<ffffffff83e479c6>] sock_sendmsg+0x56/0xb0 net/socket.c:748 [<ffffffff83e47f55>] ____sys_sendmsg+0x365/0x470 net/socket.c:2494 [<ffffffff83e4c389>] ___sys_sendmsg+0xc9/0x130 net/socket.c:2548 [<ffffffff83e4c536>] __sys_sendmsg+0xa6/0x120 net/socket.c:2577 [<ffffffff84ad7bb8>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff84ad7bb8>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd In kcm_sendmsg(), kcm_tx_msg(head)->last_skb is used as a cursor to append newly allocated skbs to 'head'. If some bytes are copied, an error occurred, and jumped to out_error label, 'last_skb' is left unmodified. A later kcm_sendmsg() will use an obsoleted 'last_skb' reference, corrupting the 'head' frag_list and causing the leak. This patch fixes this issue by properly updating the last allocated skb in 'last_skb'.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16989de75497574b5fafd174c0c233d5a86858b7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33db24ad811b3576a0c2f8862506763f2be925b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/479c71cda14b3c3a6515773faa39055333eaa2b7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5e5554389397e98fafb9efe395d8b4830dd5f042
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97275339c34cfbccd65e87bc38fd910ae66c48ba
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/af8085e0fc3207ecbf8b9e7a635c790e36d058c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c821a88bd720b0046433173185fd841a100d44ad
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/kcm/kcmsock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b",
              "status": "affected",
              "version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
              "versionType": "git"
            },
            {
              "lessThan": "5e5554389397e98fafb9efe395d8b4830dd5f042",
              "status": "affected",
              "version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
              "versionType": "git"
            },
            {
              "lessThan": "479c71cda14b3c3a6515773faa39055333eaa2b7",
              "status": "affected",
              "version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
              "versionType": "git"
            },
            {
              "lessThan": "33db24ad811b3576a0c2f8862506763f2be925b0",
              "status": "affected",
              "version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
              "versionType": "git"
            },
            {
              "lessThan": "97275339c34cfbccd65e87bc38fd910ae66c48ba",
              "status": "affected",
              "version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
              "versionType": "git"
            },
            {
              "lessThan": "16989de75497574b5fafd174c0c233d5a86858b7",
              "status": "affected",
              "version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
              "versionType": "git"
            },
            {
              "lessThan": "af8085e0fc3207ecbf8b9e7a635c790e36d058c6",
              "status": "affected",
              "version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
              "versionType": "git"
            },
            {
              "lessThan": "c821a88bd720b0046433173185fd841a100d44ad",
              "status": "affected",
              "version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/kcm/kcmsock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.326",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.295",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.257",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.195",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.132",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.5.*",
              "status": "unaffected",
              "version": "6.5.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: Fix memory leak in error path of kcm_sendmsg()\n\nsyzbot reported a memory leak like below:\n\nBUG: memory leak\nunreferenced object 0xffff88810b088c00 (size 240):\n  comm \"syz-executor186\", pid 5012, jiffies 4294943306 (age 13.680s)\n  hex dump (first 32 bytes):\n    00 89 08 0b 81 88 ff ff 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [\u003cffffffff83e5d5ff\u003e] __alloc_skb+0x1ef/0x230 net/core/skbuff.c:634\n    [\u003cffffffff84606e59\u003e] alloc_skb include/linux/skbuff.h:1289 [inline]\n    [\u003cffffffff84606e59\u003e] kcm_sendmsg+0x269/0x1050 net/kcm/kcmsock.c:815\n    [\u003cffffffff83e479c6\u003e] sock_sendmsg_nosec net/socket.c:725 [inline]\n    [\u003cffffffff83e479c6\u003e] sock_sendmsg+0x56/0xb0 net/socket.c:748\n    [\u003cffffffff83e47f55\u003e] ____sys_sendmsg+0x365/0x470 net/socket.c:2494\n    [\u003cffffffff83e4c389\u003e] ___sys_sendmsg+0xc9/0x130 net/socket.c:2548\n    [\u003cffffffff83e4c536\u003e] __sys_sendmsg+0xa6/0x120 net/socket.c:2577\n    [\u003cffffffff84ad7bb8\u003e] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n    [\u003cffffffff84ad7bb8\u003e] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80\n    [\u003cffffffff84c0008b\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nIn kcm_sendmsg(), kcm_tx_msg(head)-\u003elast_skb is used as a cursor to append\nnewly allocated skbs to \u0027head\u0027. If some bytes are copied, an error occurred,\nand jumped to out_error label, \u0027last_skb\u0027 is left unmodified. A later\nkcm_sendmsg() will use an obsoleted \u0027last_skb\u0027 reference, corrupting the\n\u0027head\u0027 frag_list and causing the leak.\n\nThis patch fixes this issue by properly updating the last allocated skb in\n\u0027last_skb\u0027."
    }
  ],
  "id": "CVE-2023-54112",
  "lastModified": "2026-06-17T06:46:49.353",
  "metrics": {},
  "published": "2025-12-24T13:16:13.103",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/16989de75497574b5fafd174c0c233d5a86858b7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/33db24ad811b3576a0c2f8862506763f2be925b0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/479c71cda14b3c3a6515773faa39055333eaa2b7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5e5554389397e98fafb9efe395d8b4830dd5f042"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/97275339c34cfbccd65e87bc38fd910ae66c48ba"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/af8085e0fc3207ecbf8b9e7a635c790e36d058c6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c821a88bd720b0046433173185fd841a100d44ad"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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