{
  "cveId": "CVE-2021-47335",
  "url": "https://patchblox.com/security/cve/CVE-2021-47335",
  "summary": "CVE-2021-47335 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47335, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to avoid racing on fsync_entry_slab by...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances  As syzbot reported, there is an use-after-free issue during f2fs recovery:  Use-after-free write at 0xffff88823bc16040 (in kfence-#10):  kmem_cache_destroy\u002B0x1f/0x120 mm/slab_common.c:486  f2fs_recover_fsync_data\u002B0x75b0/0x8380 fs/f2fs/recovery.c:869  f2fs_fill_super\u002B0x9393/0xa420 fs/f2fs/super.c:3945  mount_bdev\u002B0x26c/0x3a0 fs/super.c:1367  legacy_get_tree\u002B0xea/0x180 fs/fs_context.c:592  vfs_get_tree\u002B0x86/0x270 fs/super.c:1497  do_new_mount fs/namespace.c:2905 [inline]  path_mount\u002B0x196f/0x2be0 fs/namespace.c:3235  do_mount fs/namespace.c:3248 [inline]  __do_sys_mount fs/namespace.c:3456 [inline]  __se_sys_mount\u002B0x2f9/0x3b0 fs/namespace.c:3433  do_syscall_64\u002B0x3f/0xb0 arch/x86/entry/common.c:47  entry_SYSCALL_64_after_hwframe\u002B0x44/0xae  The root cause is multi f2fs filesystem instances can race on accessing global fsync_entry_slab pointer, result in use-after-free issue of slab cache, fixes to init/destroy this slab cache only once during module init/destroy procedure to avoid this issue.",
  "published": "2024-05-21T15:15:20Z",
  "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": 0.00232,
  "epssPercentile": 0.14155,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47335",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47335",
      "released": "2024-05-21T15:15:20Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47335",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47335",
      "released": "2024-05-21T15:15:20Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47335",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47335",
      "released": "2024-05-21T15:15:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}