{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.100-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.5-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  btrfs: fix deadlock cloning inline extent when using flushoncommit  In commit b48c980b6a7e (\"btrfs: fix deadlock between reflink and transaction commit when using flushoncommit\") a deadlock was fixed between reflinks and transaction commits when the fs is mounted with the flushoncommit option. This happened when we had to copy an inline extent's data to the destination file. However the issue was fixed only for the case where the destination offset is 0, it missed the case when the offset is greater than zero.  Fix this by ensuring we get i_size update whenever we copied an inline extent's data into the destination file.  Syzbot reported this with the following trace:     INFO: task kworker/u8:3:57 blocked for more than 143 seconds.          Not tainted syzkaller #0    \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.    task:kworker/u8:3    state:D stack:21600 pid:57    tgid:57    ppid:2      task_flags:0x4208160 flags:0x00080000    Workqueue: writeback wb_workfn (flush-btrfs-129)    Call Trace:     \u003cTASK\u003e     context_switch kernel/sched/core.c:5402 [inline]     __schedule+0x16f9/0x5500 kernel/sched/core.c:7204     __schedule_loop kernel/sched/core.c:7283 [inline]     schedule+0x164/0x360 kernel/sched/core.c:7298     wait_extent_bit fs/btrfs/extent-io-tree.c:905 [inline]     btrfs_lock_extent_bits+0x59c/0x700 fs/btrfs/extent-io-tree.c:2008     btrfs_lock_extent fs/btrfs/extent-io-tree.h:152 [inline]     btrfs_invalidate_folio+0x440/0xc00 fs/btrfs/inode.c:7718     extent_writepage fs/btrfs/extent_io.c:1848 [inline]     extent_write_cache_pages fs/btrfs/extent_io.c:2552 [inline]     btrfs_writepages+0x12f3/0x2410 fs/btrfs/extent_io.c:2684     do_writepages+0x32e/0x550 mm/page-writeback.c:2571     __writeback_single_inode+0x133/0x10e0 fs/fs-writeback.c:1764     writeback_sb_inodes+0x97f/0x1980 fs/fs-writeback.c:2056     wb_writeback+0x445/0xb00 fs/fs-writeback.c:2241     wb_do_writeback fs/fs-writeback.c:2388 [inline]     wb_workfn+0x3fd/0xf20 fs/fs-writeback.c:2428     process_one_work+0x98b/0x1630 kernel/workqueue.c:3318     process_scheduled_works kernel/workqueue.c:3401 [inline]     worker_thread+0xb49/0x1140 kernel/workqueue.c:3482     kthread+0x388/0x470 kernel/kthread.c:436     ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158     ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245     \u003c/TASK\u003e    INFO: task syz.0.145:8523 blocked for more than 143 seconds.          Not tainted syzkaller #0    \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.    task:syz.0.145       state:D stack:22752 pid:8523  tgid:8522  ppid:5850   task_flags:0x400140 flags:0x00080002    Call Trace:     \u003cTASK\u003e     context_switch kernel/sched/core.c:5402 [inline]     __schedule+0x16f9/0x5500 kernel/sched/core.c:7204     __schedule_loop kernel/sched/core.c:7283 [inline]     schedule+0x164/0x360 kernel/sched/core.c:7298     wb_wait_for_completion+0x3e8/0x790 fs/fs-writeback.c:227     __writeback_inodes_sb_nr+0x24c/0x2d0 fs/fs-writeback.c:2847     try_to_writeback_inodes_sb+0x9a/0xc0 fs/fs-writeback.c:2895     btrfs_start_delalloc_flush fs/btrfs/transaction.c:2182 [inline]     btrfs_commit_transaction+0x813/0x2fc0 fs/btrfs/transaction.c:2371     btrfs_sync_file+0xdf4/0x1230 fs/btrfs/file.c:1822     generic_write_sync include/linux/fs.h:2663 [inline]     btrfs_do_write_iter+0x6a9/0x840 fs/btrfs/file.c:1473     new_sync_write fs/read_write.c:595 [inline]     vfs_write+0x629/0xba0 fs/read_write.c:688     ksys_write+0x156/0x270 fs/read_write.c:740     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]     do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94     entry_SYSCALL_64_after_hwframe+0x77/0x7f    RIP: 0033:0x7f5a0bdece59    RSP: 002b:00007f5a0b446028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001    RAX: ffffffffffffffda RBX: 00007f5a0c065fa0 RCX: 00007f5a0bdece59    RDX: 000000000000029f RSI: 0000200000 ---truncated---",
  "id": "DEBIAN-CVE-2026-74318",
  "modified": "2026-09-14T16:47:34.502902772Z",
  "published": "2026-08-15T06:22:32.177Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74318"
    }
  ],
  "upstream": [
    "CVE-2026-74318"
  ]
}