CVE-2025-40233ocfs2: clear extent cache after moving/defragmenting extents
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% 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: clear extent cache after moving/defragmenting extents The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags. This triggers a BUG_ON in ocfs2_refcount_cal_cow_clusters(). The problem occurs when: 1. copy_file_range() creates a reflinked extent with OCFS2_EXT_REFCOUNTED 2. ioctl(FITRIM) triggers ocfs2_move_extents() 3. __ocfs2_move_extents_range() reads and caches the extent (flags=0x2) 4. ocfs2_move_extent()/ocfs2_defrag_extent() calls __ocfs2_move_extent() which clears OCFS2_EXT_REFCOUNTED flag on disk (flags=0x0) 5. The extent map cache is not invalidated after the move 6. Later write() operations read stale cached flags (0x2) but disk has updated flags (0x0), causing a mismatch 7. BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) triggers Fix by clearing the extent map cache after each extent move/defrag operation in __ocfs2_move_extents_range(). This ensures subsequent operations read fresh extent data from disk.
Timeline
ID reserved
By Linux
- 8 months later
· 8 months later
Published
- 8 months later
· 8 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:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 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 53069d4e76954e2e63c1b3c501051c6fbcf7298c – < 93166bc53c0e3587058327a4121daea34b4fecd5
- affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c – < a7ee72286efba1d407c6f15a0528e43593fb7007
- affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c – < 93b1ab422f1966b71561158e1aedce4ec100f357
- affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c – < e92af7737a94a729225d2a5d180eaaa77fe0bbc1
- affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c – < aa6a21409dd6221bb268b56bb410e031c632ff9a
- affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c – < bb69928ed578f881e68d26aaf1a8f6e7faab3b44
- affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c – < a21750df2f6169af6e039a3bb4893d6c9564e48d
- affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c – < 78a63493f8e352296dbc7cb7b3f4973105e8679e
- affected 3.0
- unaffected < 3.0
- unaffected 5.4.301 – ≤ 5.4.*
- unaffected 5.10.246 – ≤ 5.10.*
- unaffected 5.15.196 – ≤ 5.15.*
- unaffected 6.1.158 – ≤ 6.1.*
- unaffected 6.6.115 – ≤ 6.6.*
- unaffected 6.12.56 – ≤ 6.12.*
- unaffected 6.17.6 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References8
- https://git.kernel.org/stable/c/93166bc53c0e3587058327a4121daea34b4fecd5 (opens in a new tab)
- https://git.kernel.org/stable/c/a7ee72286efba1d407c6f15a0528e43593fb7007 (opens in a new tab)
- https://git.kernel.org/stable/c/93b1ab422f1966b71561158e1aedce4ec100f357 (opens in a new tab)
- https://git.kernel.org/stable/c/e92af7737a94a729225d2a5d180eaaa77fe0bbc1 (opens in a new tab)
- https://git.kernel.org/stable/c/aa6a21409dd6221bb268b56bb410e031c632ff9a (opens in a new tab)
- https://git.kernel.org/stable/c/bb69928ed578f881e68d26aaf1a8f6e7faab3b44 (opens in a new tab)
- https://git.kernel.org/stable/c/a21750df2f6169af6e039a3bb4893d6c9564e48d (opens in a new tab)
- https://git.kernel.org/stable/c/78a63493f8e352296dbc7cb7b3f4973105e8679e (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-2025-201226 (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-2025-40233)Record last updated .