CVE-2026-43076ocfs2: validate inline data i_size during inode read
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate inline data i_size during inode read When reading an inode from disk, ocfs2_validate_inode_block() performs various sanity checks but does not validate the size of inline data. If the filesystem is corrupted, an inode's i_size can exceed the actual inline data capacity (id_count). This causes ocfs2_dir_foreach_blk_id() to iterate beyond the inline data buffer, triggering a use-after-free when accessing directory entries from freed memory. In the syzbot report: - i_size was 1099511627576 bytes (~1TB) - Actual inline data capacity (id_count) is typically <256 bytes - A garbage rec_len (54648) caused ctx->pos to jump out of bounds - This triggered a UAF in ocfs2_check_dir_entry() Fix by adding a validation check in ocfs2_validate_inode_block() to ensure inodes with inline data have i_size <= id_count. This catches the corruption early during inode read and prevents all downstream code from operating on invalid data.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 3 months later
· 3 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 |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 23193e513d1cd69411469f028d56fd175d4a6b07 – < d012c782abcabe68b5b9e71be58a15e9f9d83dc1
- affected 23193e513d1cd69411469f028d56fd175d4a6b07 – < bcd46bc261b215b3b12c557a978299eafa02ecdd
- affected 23193e513d1cd69411469f028d56fd175d4a6b07 – < 131c0b573e1b467b7d553e9ff38003f1acd8f5f2
- affected 23193e513d1cd69411469f028d56fd175d4a6b07 – < 37f074e65f24f10f8d8df224a572e4cb9e6faf63
- affected 23193e513d1cd69411469f028d56fd175d4a6b07 – < c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b
- affected 23193e513d1cd69411469f028d56fd175d4a6b07 – < cd2d765aa7157f852999842af32148128c735d39
- affected 23193e513d1cd69411469f028d56fd175d4a6b07 – < 77d0295725109d77f5854ef5b58c0d06c08168cc
- affected 23193e513d1cd69411469f028d56fd175d4a6b07 – < 1524af3685b35feac76662cc551cbc37bd14775f
- affected 2.6.24
- unaffected < 2.6.24
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.136 – ≤ 6.6.*
- unaffected 6.12.83 – ≤ 6.12.*
- unaffected 6.18.24 – ≤ 6.18.*
- unaffected 6.19.14 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References8
- https://git.kernel.org/stable/c/d012c782abcabe68b5b9e71be58a15e9f9d83dc1 (opens in a new tab)
- https://git.kernel.org/stable/c/bcd46bc261b215b3b12c557a978299eafa02ecdd (opens in a new tab)
- https://git.kernel.org/stable/c/131c0b573e1b467b7d553e9ff38003f1acd8f5f2 (opens in a new tab)
- https://git.kernel.org/stable/c/37f074e65f24f10f8d8df224a572e4cb9e6faf63 (opens in a new tab)
- https://git.kernel.org/stable/c/c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b (opens in a new tab)
- https://git.kernel.org/stable/c/cd2d765aa7157f852999842af32148128c735d39 (opens in a new tab)
- https://git.kernel.org/stable/c/77d0295725109d77f5854ef5b58c0d06c08168cc (opens in a new tab)
- https://git.kernel.org/stable/c/1524af3685b35feac76662cc551cbc37bd14775f (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)
- EUVD EUVD-2026-27563 (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://cveledger.app/cve/CVE-2026-43076)Record last updated .