CVE-2022-49879
ext4: fix BUG_ON() when directory entry has invalid rec_len
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix BUG_ON() when directory entry has invalid rec_len The rec_len field in the directory entry has to be a multiple of 4. A corrupted filesystem image can be used to hit a BUG() in ext4_rec_len_to_disk(), called from make_indexed_dir(). ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4.h:2413! ... RIP: 0010:make_indexed_dir+0x53f/0x5f0 ... Call Trace: <TASK> ? add_dirent_to_buf+0x1b2/0x200 ext4_add_entry+0x36e/0x480 ext4_add_nondir+0x2b/0xc0 ext4_create+0x163/0x200 path_openat+0x635/0xe90 do_filp_open+0xb4/0x160 ? __create_object.isra.0+0x1de/0x3b0 ? _raw_spin_unlock+0x12/0x30 do_sys_openat2+0x91/0x150 __x64_sys_open+0x6c/0xa0 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The fix simply adds a call to ext4_check_dir_entry() to validate the directory entry, returning -EFSCORRUPTED if the entry is invalid.
Timeline
ID reserved
By Linux
Published
- 18 months later
· 18 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.22% · top 88% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 – < 2fa24d0274fbf913b56ee31f15bc01168669d909
- affected 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 – < 156451a67b93986fb07c274ef6995ff40766c5ad
- affected 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 – < 999cff2b6ce3b45c08abf793bf55534777421327
- affected 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 – < ce1ee2c8827fb6493e91acbd50f664cf2a972c3d
- affected 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 – < 17a0bc9bd697f75cfdf9b378d5eb2d7409c91340
- affected 2.6.30
- unaffected < 2.6.30
- unaffected 5.4.224 – ≤ 5.4.*
- unaffected 5.10.154 – ≤ 5.10.*
- unaffected 5.15.78 – ≤ 5.15.*
- unaffected 6.0.8 – ≤ 6.0.*
- unaffected 6.1 – ≤ *
References (5)
- https://git.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909 (opens in a new tab)
- https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5ad (opens in a new tab)
- https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327 (opens in a new tab)
- https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3d (opens in a new tab)
- https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49879)Record last updated .