{
  "cveId": "CVE-2023-53344",
  "url": "https://patchblox.com/security/cve/CVE-2023-53344",
  "summary": "CVE-2023-53344 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53344, released September 17, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  can: bcm: bcm_tx_setup(): fix KMSAN uninit-value...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  can: bcm: bcm_tx_setup(): fix KMSAN uninit-value in vfs_write  Syzkaller reported the following issue:  ===================================================== BUG: KMSAN: uninit-value in aio_rw_done fs/aio.c:1520 [inline] BUG: KMSAN: uninit-value in aio_write\u002B0x899/0x950 fs/aio.c:1600  aio_rw_done fs/aio.c:1520 [inline]  aio_write\u002B0x899/0x950 fs/aio.c:1600  io_submit_one\u002B0x1d1c/0x3bf0 fs/aio.c:2019  __do_sys_io_submit fs/aio.c:2078 [inline]  __se_sys_io_submit\u002B0x293/0x770 fs/aio.c:2048  __x64_sys_io_submit\u002B0x92/0xd0 fs/aio.c:2048  do_syscall_x64 arch/x86/entry/common.c:50 [inline]  do_syscall_64\u002B0x3d/0xb0 arch/x86/entry/common.c:80  entry_SYSCALL_64_after_hwframe\u002B0x63/0xcd  Uninit was created at:  slab_post_alloc_hook mm/slab.h:766 [inline]  slab_alloc_node mm/slub.c:3452 [inline]  __kmem_cache_alloc_node\u002B0x71f/0xce0 mm/slub.c:3491  __do_kmalloc_node mm/slab_common.c:967 [inline]  __kmalloc\u002B0x11d/0x3b0 mm/slab_common.c:981  kmalloc_array include/linux/slab.h:636 [inline]  bcm_tx_setup\u002B0x80e/0x29d0 net/can/bcm.c:930  bcm_sendmsg\u002B0x3a2/0xce0 net/can/bcm.c:1351  sock_sendmsg_nosec net/socket.c:714 [inline]  sock_sendmsg net/socket.c:734 [inline]  sock_write_iter\u002B0x495/0x5e0 net/socket.c:1108  call_write_iter include/linux/fs.h:2189 [inline]  aio_write\u002B0x63a/0x950 fs/aio.c:1600  io_submit_one\u002B0x1d1c/0x3bf0 fs/aio.c:2019  __do_sys_io_submit fs/aio.c:2078 [inline]  __se_sys_io_submit\u002B0x293/0x770 fs/aio.c:2048  __x64_sys_io_submit\u002B0x92/0xd0 fs/aio.c:2048  do_syscall_x64 arch/x86/entry/common.c:50 [inline]  do_syscall_64\u002B0x3d/0xb0 arch/x86/entry/common.c:80  entry_SYSCALL_64_after_hwframe\u002B0x63/0xcd  CPU: 1 PID: 5034 Comm: syz-executor350 Not tainted 6.2.0-rc6-syzkaller-80422-geda666ff2276 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 =====================================================  We can follow the call chain and find that \u0027bcm_tx_setup\u0027 function calls \u0027memcpy_from_msg\u0027 to copy some content to the newly allocated frame of \u0027op-\u003Eframes\u0027. After that the \u0027len\u0027 field of copied structure being compared with some constant value (64 or 8). However, if \u0027memcpy_from_msg\u0027 returns an error, we will compare some uninitialized memory. This triggers \u0027uninit-value\u0027 issue.  This patch will add \u0027memcpy_from_msg\u0027 possible errors processing to avoid uninit-value issue.  Tested via syzkaller",
  "published": "2025-09-17T15:15:38Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00203,
  "epssPercentile": 0.10315,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53344",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53344",
      "released": "2025-09-17T15:15:38Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53344",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53344",
      "released": "2025-09-17T15:15:38Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53344",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53344",
      "released": "2025-09-17T15:15:38Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}