{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.6-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  fs/super: fix emergency thaw double-unlock of s_umount  do_thaw_all() iterates over all superblocks via __iterate_supers() with SUPER_ITER_EXCL, which acquires s_umount exclusively before calling the callback and releases it afterwards. However, the callback do_thaw_all_callback() calls thaw_super_locked() which unconditionally releases s_umount on every code path. This results in a second unlock attempt in __iterate_supers() that corrupts the rwsem state, triggering a DEBUG_RWSEMS warning:  [  182.601148] sysrq: Emergency Thaw of all frozen filesystems [  182.601865] ------------[ cut here ]------------ [  182.602375] DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) \u0026\u0026 !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff99b1011e5870, owner = 0x0, curr 0xffff99b101b06c80, list not empty [  182.603817] WARNING: kernel/locking/rwsem.c:1412 at up_write+0xa3/0x170, CPU#2: kworker/2:1/53 [  182.604578] Modules linked in: [  182.604864] CPU: 2 UID: 0 PID: 53 Comm: kworker/2:1 Not tainted 7.2.0-rc4-00001-gbd3bd93ea98a-dirty #4 PREEMPT(lazy) [  182.605711] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1kylin1 04/01/2014 [  182.606417] Workqueue: events do_thaw_all [  182.606750] RIP: 0010:up_write+0xaf/0x170 [  182.607076] Code: 19 3a 92 48 0f 44 c2 48 8b 55 08 48 8b 55 00 4c 8b 45 08 48 8b 55 00 48 8d 3d ad 91 e0 01 48 8b 4d 20 50 48 c7 c6 f0 8c 26 92 \u003c67\u003e 48 0f b9 3a e8 d7 93 4e 00 58 eb 81 48 83 7f 18 00 48 c7 c2 8d [  182.608563] RSP: 0018:ffffb670001d7e08 EFLAGS: 00010246 [  182.609007] RAX: ffffffff92349e8d RBX: 0000000000000000 RCX: ffff99b1011e5870 [  182.609595] RDX: 0000000000000000 RSI: ffffffff92268cf0 RDI: ffffffff92914d10 [  182.610283] RBP: ffff99b1011e5870 R08: 0000000000000000 R09: ffff99b101b06c80 [  182.610847] R10: ffff99b10139a808 R11: fefefefefefefeff R12: 0000000000000000 [  182.611414] R13: ffffffff90cf74d0 R14: 0000000000000000 R15: ffff99b1011e5800 [  182.612009] FS:  0000000000000000(0000) GS:ffff99b1eaaee000(0000) knlGS:0000000000000000 [  182.612670] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [  182.613146] CR2: 00000000005c631c CR3: 00000000013ee000 CR4: 00000000000006f0 [  182.613722] Call Trace: [  182.613946]  \u003cTASK\u003e [  182.614130]  __iterate_supers+0x128/0x150 [  182.614463]  do_thaw_all+0x1b/0x30 [  182.614759]  process_scheduled_works+0xbb/0x3f0 [  182.615150]  ? __pfx_worker_thread+0x10/0x10 [  182.615499]  worker_thread+0x129/0x270 [  182.615816]  ? __pfx_worker_thread+0x10/0x10 [  182.616201]  kthread+0xe2/0x120 [  182.616469]  ? __pfx_kthread+0x10/0x10 [  182.616792]  ret_from_fork+0x15b/0x240 [  182.617115]  ? __pfx_kthread+0x10/0x10 [  182.617426]  ret_from_fork_asm+0x1a/0x30 [  182.617761]  \u003c/TASK\u003e [  182.617968] ---[ end trace 0000000000000000 ]--- [  182.618412] Emergency Thaw complete  Fix this by switching to SUPER_ITER_UNLOCKED and acquiring s_umount in the callback via super_lock_excl() before calling thaw_super_locked(). This matches the locking pattern expected by thaw_super_locked() and eliminates the double unlock.  While at it, remove the dead 'return;' at the end of do_thaw_all_callback().",
  "id": "DEBIAN-CVE-2026-68150",
  "modified": "2026-09-14T16:47:30.056844773Z",
  "published": "2026-08-10T13:20:01.010Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-68150"
    }
  ],
  "upstream": [
    "CVE-2026-68150"
  ]
}