{
  "cveId": "CVE-2022-50432",
  "url": "https://patchblox.com/security/cve/CVE-2022-50432",
  "summary": "CVE-2022-50432 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50432, released October 1, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  kernfs: fix use-after-free in __kernfs_remove  S...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  kernfs: fix use-after-free in __kernfs_remove  Syzkaller managed to trigger concurrent calls to kernfs_remove_by_name_ns() for the same file resulting in a KASAN detected use-after-free. The race occurs when the root node is freed during kernfs_drain().  To prevent this acquire an additional reference for the root of the tree that is removed before calling __kernfs_remove().  Found by syzkaller with the following reproducer (slab_nomerge is required):  syz_mount_image$ext4(0x0, \u0026(0x7f0000000100)=\u0027./file0\\x00\u0027, 0x100000, 0x0, 0x0, 0x0, 0x0) r0 = openat(0xffffffffffffff9c, \u0026(0x7f0000000080)=\u0027/proc/self/exe\\x00\u0027, 0x0, 0x0) close(r0) pipe2(\u0026(0x7f0000000140)={0xffffffffffffffff, \u003Cr1=\u003E0xffffffffffffffff}, 0x800) mount$9p_fd(0x0, \u0026(0x7f0000000040)=\u0027./file0\\x00\u0027, \u0026(0x7f00000000c0), 0x408, \u0026(0x7f0000000280)={\u0027trans=fd,\u0027, {\u0027rfdno\u0027, 0x3d, r0}, 0x2c, {\u0027wfdno\u0027, 0x3d, r1}, 0x2c, {[{@cache_loose}, {@mmap}, {@loose}, {@loose}, {@mmap}], [{@mask={\u0027mask\u0027, 0x3d, \u0027^MAY_EXEC\u0027}}, {@fsmagic={\u0027fsmagic\u0027, 0x3d, 0x10001}}, {@dont_hash}]}})  Sample report:  ================================================================== BUG: KASAN: use-after-free in kernfs_type include/linux/kernfs.h:335 [inline] BUG: KASAN: use-after-free in kernfs_leftmost_descendant fs/kernfs/dir.c:1261 [inline] BUG: KASAN: use-after-free in __kernfs_remove.part.0\u002B0x843/0x960 fs/kernfs/dir.c:1369 Read of size 2 at addr ffff8880088807f0 by task syz-executor.2/857  CPU: 0 PID: 857 Comm: syz-executor.2 Not tainted 6.0.0-rc3-00363-g7726d4c3e60b #5 Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace:  \u003CTASK\u003E  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl\u002B0x6e/0x91 lib/dump_stack.c:106  print_address_description mm/kasan/report.c:317 [inline]  print_report.cold\u002B0x5e/0x5e5 mm/kasan/report.c:433  kasan_report\u002B0xa3/0x130 mm/kasan/report.c:495  kernfs_type include/linux/kernfs.h:335 [inline]  kernfs_leftmost_descendant fs/kernfs/dir.c:1261 [inline]  __kernfs_remove.part.0\u002B0x843/0x960 fs/kernfs/dir.c:1369  __kernfs_remove fs/kernfs/dir.c:1356 [inline]  kernfs_remove_by_name_ns\u002B0x108/0x190 fs/kernfs/dir.c:1589  sysfs_slab_add\u002B0x133/0x1e0 mm/slub.c:5943  __kmem_cache_create\u002B0x3e0/0x550 mm/slub.c:4899  create_cache mm/slab_common.c:229 [inline]  kmem_cache_create_usercopy\u002B0x167/0x2a0 mm/slab_common.c:335  p9_client_create\u002B0xd4d/0x1190 net/9p/client.c:993  v9fs_session_init\u002B0x1e6/0x13c0 fs/9p/v9fs.c:408  v9fs_mount\u002B0xb9/0xbd0 fs/9p/vfs_super.c:126  legacy_get_tree\u002B0xf1/0x200 fs/fs_context.c:610  vfs_get_tree\u002B0x85/0x2e0 fs/super.c:1530  do_new_mount fs/namespace.c:3040 [inline]  path_mount\u002B0x675/0x1d00 fs/namespace.c:3370  do_mount fs/namespace.c:3383 [inline]  __do_sys_mount fs/namespace.c:3591 [inline]  __se_sys_mount fs/namespace.c:3568 [inline]  __x64_sys_mount\u002B0x282/0x300 fs/namespace.c:3568  do_syscall_x64 arch/x86/entry/common.c:50 [inline]  do_syscall_64\u002B0x38/0x90 arch/x86/entry/common.c:80  entry_SYSCALL_64_after_hwframe\u002B0x63/0xcd RIP: 0033:0x7f725f983aed Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003C48\u003E 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f725f0f7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f725faa3f80 RCX: 00007f725f983aed RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007f725f9f419c R08: 0000000020000280 R09: 0000000000000000 R10: 0000000000000408 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000006 R14: 00007f725faa3f80 R15: 00007f725f0d7000  \u003C/TASK\u003E  Allocated by task 855:  kasan_save_stack\u002B0x1e/0x40 mm/kasan/common.c:38  kasan_set_track mm/kasan/common.c:45 [inline]  set_alloc_info mm/kasan/common.c:437 [inline]  __kasan_slab_alloc\u002B0x66/0x80 mm/kasan/common.c:470  kasan_slab_alloc include/linux/kasan.h:224 [inline]  slab_post_alloc_hook mm/slab.h:7 ---truncated---",
  "published": "2025-10-01T12:15:34Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00164,
  "epssPercentile": 0.05594,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.0.7-1",
      "fix": "DEBIAN-CVE-2022-50432",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-50432",
      "released": "2025-10-01T12:15:34Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.0.7-1",
      "fix": "DEBIAN-CVE-2022-50432",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-50432",
      "released": "2025-10-01T12:15:34Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.0.7-1",
      "fix": "DEBIAN-CVE-2022-50432",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-50432",
      "released": "2025-10-01T12:15:34Z"
    }
  ],
  "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"
  }
}