{
  "cveId": "CVE-2022-49068",
  "url": "https://patchblox.com/security/cve/CVE-2022-49068",
  "summary": "CVE-2022-49068 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49068, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  btrfs: release correct delalloc amount in direct...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  btrfs: release correct delalloc amount in direct IO write path  Running generic/406 causes the following WARNING in btrfs_destroy_inode() which tells there are outstanding extents left.  In btrfs_get_blocks_direct_write(), we reserve a temporary outstanding extents with btrfs_delalloc_reserve_metadata() (or indirectly from btrfs_delalloc_reserve_space(()). We then release the outstanding extents with btrfs_delalloc_release_extents(). However, the \u0022len\u0022 can be modified in the COW case, which releases fewer outstanding extents than expected.  Fix it by calling btrfs_delalloc_release_extents() for the original length.  To reproduce the warning, the filesystem should be 1 GiB.  It\u0027s triggering a short-write, due to not being able to allocate a large extent and instead allocating a smaller one.    WARNING: CPU: 0 PID: 757 at fs/btrfs/inode.c:8848 btrfs_destroy_inode\u002B0x1e6/0x210 [btrfs]   Modules linked in: btrfs blake2b_generic xor lzo_compress   lzo_decompress raid6_pq zstd zstd_decompress zstd_compress xxhash zram   zsmalloc   CPU: 0 PID: 757 Comm: umount Not tainted 5.17.0-rc8\u002B #101   Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS d55cb5a 04/01/2014   RIP: 0010:btrfs_destroy_inode\u002B0x1e6/0x210 [btrfs]   RSP: 0018:ffffc9000327bda8 EFLAGS: 00010206   RAX: 0000000000000000 RBX: ffff888100548b78 RCX: 0000000000000000   RDX: 0000000000026900 RSI: 0000000000000000 RDI: ffff888100548b78   RBP: ffff888100548940 R08: 0000000000000000 R09: ffff88810b48aba8   R10: 0000000000000001 R11: ffff8881004eb240 R12: ffff88810b48a800   R13: ffff88810b48ec08 R14: ffff88810b48ed00 R15: ffff888100490c68   FS:  00007f8549ea0b80(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   CR2: 00007f854a09e733 CR3: 000000010a2e9003 CR4: 0000000000370eb0   DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000   DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400   Call Trace:    \u003CTASK\u003E    destroy_inode\u002B0x33/0x70    dispose_list\u002B0x43/0x60    evict_inodes\u002B0x161/0x1b0    generic_shutdown_super\u002B0x2d/0x110    kill_anon_super\u002B0xf/0x20    btrfs_kill_super\u002B0xd/0x20 [btrfs]    deactivate_locked_super\u002B0x27/0x90    cleanup_mnt\u002B0x12c/0x180    task_work_run\u002B0x54/0x80    exit_to_user_mode_prepare\u002B0x152/0x160    syscall_exit_to_user_mode\u002B0x12/0x30    do_syscall_64\u002B0x42/0x80    entry_SYSCALL_64_after_hwframe\u002B0x44/0xae    RIP: 0033:0x7f854a000fb7",
  "published": "2025-02-26T07:00:44Z",
  "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": 0.00258,
  "epssPercentile": 0.17593,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.17.6-1",
      "fix": "DEBIAN-CVE-2022-49068",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49068",
      "released": "2025-02-26T07:00:44Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.17.6-1",
      "fix": "DEBIAN-CVE-2022-49068",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49068",
      "released": "2025-02-26T07:00:44Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.17.6-1",
      "fix": "DEBIAN-CVE-2022-49068",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49068",
      "released": "2025-02-26T07:00:44Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}