f2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances
Summary
| CVE | CVE-2021-47335 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2024-05-21 15:15:20 UTC |
| Updated | 2026-08-11 03:17:20 UTC |
| 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+0x1f/0x120 mm/slab_common.c:486 f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869 f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945 mount_bdev+0x26c/0x3a0 fs/super.c:1367 legacy_get_tree+0xea/0x180 fs/fs_context.c:592 vfs_get_tree+0x86/0x270 fs/super.c:1497 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x196f/0x2be0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae 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. |
Risk And Classification
Primary CVSS: v3.1 5.5 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Problem Types: CWE-416
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected d624c96fb3249e5d3dcf4e60a805e5e6b0dd7d91 86786603014e0a22d0d6af8e80ae4b8687927048 git | Not specified |
| CNA | Linux | Linux | affected d624c96fb3249e5d3dcf4e60a805e5e6b0dd7d91 79fa5d944c875711253a23b8155b36883c696409 git | Not specified |
| CNA | Linux | Linux | affected d624c96fb3249e5d3dcf4e60a805e5e6b0dd7d91 e472b276a0d2180808009be38105e12754432e2a git | Not specified |
| CNA | Linux | Linux | affected d624c96fb3249e5d3dcf4e60a805e5e6b0dd7d91 cad83c968c2ebe97905f900326988ed37146c347 git | Not specified |
| CNA | Linux | Linux | affected 3.8 | Not specified |
| CNA | Linux | Linux | unaffected 3.8 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.51 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.12.18 5.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.13.3 5.13.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.14 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.