{
  "cveId": "CVE-2025-68796",
  "url": "https://patchblox.com/security/cve/CVE-2025-68796",
  "summary": "CVE-2025-68796 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-68796, released January 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "f2fs: fix to avoid updating zero-sized extent in extent cache",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to avoid updating zero-sized extent in extent cache  As syzbot reported:  F2FS-fs (loop0): __update_extent_tree_range: extent len is zero, type: 0, extent [0, 0, 0], age [0, 0] ------------[ cut here ]------------ kernel BUG at fs/f2fs/extent_cache.c:678! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12\u002B1 04/01/2014 RIP: 0010:__update_extent_tree_range\u002B0x13bc/0x1500 fs/f2fs/extent_cache.c:678 Call Trace:  \u003CTASK\u003E  f2fs_update_read_extent_cache_range\u002B0x192/0x3e0 fs/f2fs/extent_cache.c:1085  f2fs_do_zero_range fs/f2fs/file.c:1657 [inline]  f2fs_zero_range\u002B0x10c1/0x1580 fs/f2fs/file.c:1737  f2fs_fallocate\u002B0x583/0x990 fs/f2fs/file.c:2030  vfs_fallocate\u002B0x669/0x7e0 fs/open.c:342  ioctl_preallocate fs/ioctl.c:289 [inline]  file_ioctl\u002B0x611/0x780 fs/ioctl.c:-1  do_vfs_ioctl\u002B0xb33/0x1430 fs/ioctl.c:576  __do_sys_ioctl fs/ioctl.c:595 [inline]  __se_sys_ioctl\u002B0x82/0x170 fs/ioctl.c:583  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]  do_syscall_64\u002B0xfa/0x3b0 arch/x86/entry/syscall_64.c:94  entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f RIP: 0033:0x7f07bc58eec9  In error path of f2fs_zero_range(), it may add a zero-sized extent into extent cache, it should be avoided.",
  "published": "2026-01-13T16:16:01Z",
  "severity": "Moderate",
  "cvss": 5,
  "epss": 0.00207,
  "epssPercentile": 0.10834,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-68796",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.162-1",
      "fix": "DEBIAN-CVE-2025-68796",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-68796",
      "released": "2026-01-13T16:16:01Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.69-1",
      "fix": "DEBIAN-CVE-2025-68796",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-68796",
      "released": "2026-01-13T16:16:01Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.18.3-1",
      "fix": "DEBIAN-CVE-2025-68796",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-68796",
      "released": "2026-01-13T16:16:01Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}