{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-54112",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-54112"
  ],
  "published": "2025-12-24T13:11:50Z",
  "summary": "kcm: Fix memory leak in error path of kcm_sendmsg()",
  "details": "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    [<ffffffff83e5d5ff>] __alloc_skb+0x1ef/0x230 net/core/skbuff.c:634\n    [<ffffffff84606e59>] alloc_skb include/linux/skbuff.h:1289 [inline]\n    [<ffffffff84606e59>] kcm_sendmsg+0x269/0x1050 net/kcm/kcmsock.c:815\n    [<ffffffff83e479c6>] sock_sendmsg_nosec net/socket.c:725 [inline]\n    [<ffffffff83e479c6>] sock_sendmsg+0x56/0xb0 net/socket.c:748\n    [<ffffffff83e47f55>] ____sys_sendmsg+0x365/0x470 net/socket.c:2494\n    [<ffffffff83e4c389>] ___sys_sendmsg+0xc9/0x130 net/socket.c:2548\n    [<ffffffff83e4c536>] __sys_sendmsg+0xa6/0x120 net/socket.c:2577\n    [<ffffffff84ad7bb8>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n    [<ffffffff84ad7bb8>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80\n    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nIn kcm_sendmsg(), kcm_tx_msg(head)->last_skb is used as a cursor to append\nnewly allocated skbs to 'head'. If some bytes are copied, an error occurred,\nand jumped to out_error label, 'last_skb' is left unmodified. A later\nkcm_sendmsg() will use an obsoleted 'last_skb' reference, corrupting the\n'head' frag_list and causing the leak.\n\nThis patch fixes this issue by properly updating the last allocated skb in\n'last_skb'.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.54",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-54112"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5e5554389397e98fafb9efe395d8b4830dd5f042"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/479c71cda14b3c3a6515773faa39055333eaa2b7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/33db24ad811b3576a0c2f8862506763f2be925b0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/97275339c34cfbccd65e87bc38fd910ae66c48ba"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/16989de75497574b5fafd174c0c233d5a86858b7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af8085e0fc3207ecbf8b9e7a635c790e36d058c6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c821a88bd720b0046433173185fd841a100d44ad"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}