Answer in brief
CVE-2025-40233 records a High severity (CVSS 7.8) vulnerability in ocfs2: clear extent cache after moving/defragmenting extents. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=53069d4e76954e2e63c1b3c501051c6fbcf7298c <93166bc53c0e3587058327a4121daea34b4fecd5 || >=53069d4e76954e2e63c1b3c501051c6fbcf7298c <a7ee72286efba1d407c6f15a0528e43593fb7007 || >=53069d4e76954e2e63c1b3c501051c6fbcf7298c <93b1ab422f1966b71561158e1aedce4ec100f357 || >=53069d4e76954e2e63c1b3c501051c6fbcf7298c <e92af7737a94a729225d2a5d180eaaa77fe0bbc1 || >=53069d4e76954e2e63c1b3c501051c6fbcf7298c <aa6a21409dd6221bb268b56bb410e031c632ff9a || >=53069d4e76954e2e63c1b3c501051c6fbcf7298c <bb69928ed578f881e68d26aaf1a8f6e7faab3b44 || >=53069d4e76954e2e63c1b3c501051c6fbcf7298c <a21750df2f6169af6e039a3bb4893d6c9564e48d || >=53069d4e76954e2e63c1b3c501051c6fbcf7298c <78a63493f8e352296dbc7cb7b3f4973105e8679e | 93166bc53c0e3587058327a4121daea34b4fecd5, a7ee72286efba1d407c6f15a0528e43593fb7007, 93b1ab422f1966b71561158e1aedce4ec100f357, e92af7737a94a729225d2a5d180eaaa77fe0bbc1, aa6a21409dd6221bb268b56bb410e031c632ff9a, bb69928ed578f881e68d26aaf1a8f6e7faab3b44, a21750df2f6169af6e039a3bb4893d6c9564e48d, 78a63493f8e352296dbc7cb7b3f4973105e8679e |
| Linux/Linuxgeneric | 3.0 | Not reported |
Published upstream
Dec 4, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags.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.
Quoted source text, attributed separately from HOL analysis.