{
  "cveId": "CVE-2024-42111",
  "url": "https://patchblox.com/security/cve/CVE-2024-42111",
  "summary": "CVE-2024-42111 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-42111, released July 30, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  btrfs: always do the basic checks for btrfs_qgro...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  btrfs: always do the basic checks for btrfs_qgroup_inherit structure  [BUG] Syzbot reports the following regression detected by KASAN:    BUG: KASAN: slab-out-of-bounds in btrfs_qgroup_inherit\u002B0x42e/0x2e20 fs/btrfs/qgroup.c:3277   Read of size 8 at addr ffff88814628ca50 by task syz-executor318/5171    CPU: 0 PID: 5171 Comm: syz-executor318 Not tainted 6.10.0-rc2-syzkaller-00010-g2ab795141095 #0   Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024   Call Trace:    \u003CTASK\u003E    __dump_stack lib/dump_stack.c:88 [inline]    dump_stack_lvl\u002B0x241/0x360 lib/dump_stack.c:114    print_address_description mm/kasan/report.c:377 [inline]    print_report\u002B0x169/0x550 mm/kasan/report.c:488    kasan_report\u002B0x143/0x180 mm/kasan/report.c:601    btrfs_qgroup_inherit\u002B0x42e/0x2e20 fs/btrfs/qgroup.c:3277    create_pending_snapshot\u002B0x1359/0x29b0 fs/btrfs/transaction.c:1854    create_pending_snapshots\u002B0x195/0x1d0 fs/btrfs/transaction.c:1922    btrfs_commit_transaction\u002B0xf20/0x3740 fs/btrfs/transaction.c:2382    create_snapshot\u002B0x6a1/0x9e0 fs/btrfs/ioctl.c:875    btrfs_mksubvol\u002B0x58f/0x710 fs/btrfs/ioctl.c:1029    btrfs_mksnapshot\u002B0xb5/0xf0 fs/btrfs/ioctl.c:1075    __btrfs_ioctl_snap_create\u002B0x387/0x4b0 fs/btrfs/ioctl.c:1340    btrfs_ioctl_snap_create_v2\u002B0x1f2/0x3a0 fs/btrfs/ioctl.c:1422    btrfs_ioctl\u002B0x99e/0xc60    vfs_ioctl fs/ioctl.c:51 [inline]    __do_sys_ioctl fs/ioctl.c:907 [inline]    __se_sys_ioctl\u002B0xfc/0x170 fs/ioctl.c:893    do_syscall_x64 arch/x86/entry/common.c:52 [inline]    do_syscall_64\u002B0xf3/0x230 arch/x86/entry/common.c:83    entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f   RIP: 0033:0x7fcbf1992509   RSP: 002b:00007fcbf1928218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010   RAX: ffffffffffffffda RBX: 00007fcbf1a1f618 RCX: 00007fcbf1992509   RDX: 0000000020000280 RSI: 0000000050009417 RDI: 0000000000000003   RBP: 00007fcbf1a1f610 R08: 00007ffea1298e97 R09: 0000000000000000   R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcbf19eb660   R13: 00000000200002b8 R14: 00007fcbf19e60c0 R15: 0030656c69662f2e    \u003C/TASK\u003E  And it also pinned it down to commit b5357cb268c4 (\u0022btrfs: qgroup: do not check qgroup inherit if qgroup is disabled\u0022).  [CAUSE] That offending commit skips the whole qgroup inherit check if qgroup is not enabled.  But that also skips the very basic checks like num_ref_copies/num_excl_copies and the structure size checks.  Meaning if a qgroup enable/disable race is happening at the background, and we pass a btrfs_qgroup_inherit structure when the qgroup is disabled, the check would be completely skipped.  Then at the time of transaction commitment, qgroup is re-enabled and btrfs_qgroup_inherit() is going to use the incorrect structure and causing the above KASAN error.  [FIX] Make btrfs_qgroup_check_inherit() only skip the source qgroup checks. So that even if invalid btrfs_qgroup_inherit structure is passed in, we can still reject invalid ones no matter if qgroup is enabled or not.  Furthermore we do already have an extra safety inside btrfs_qgroup_inherit(), which would just ignore invalid qgroup sources, so even if we only skip the qgroup source check we\u0027re still safe.",
  "published": "2024-07-30T08:15:03Z",
  "severity": "medium",
  "cvss": 6.3,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.0021,
  "epssPercentile": 0.11276,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.9.9-1",
      "fix": "DEBIAN-CVE-2024-42111",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-42111",
      "released": "2024-07-30T08:15:03Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.9.9-1",
      "fix": "DEBIAN-CVE-2024-42111",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-42111",
      "released": "2024-07-30T08:15:03Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}