CVE-2025-40233
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The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags.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.
How to fix
- Linux Linux93166bc53c0e3587058327a4121daea34b4fecd5, a7ee72286efba1d407c6f15a0528e43593fb7007, 93b1ab422f1966b71561158e1aedce4ec100f357, e92af7737a94a729225d2a5d180eaaa77fe0bbc1, aa6a21409dd6221bb268b56bb410e031c632ff9a, bb69928ed578f881e68d26aaf1a8f6e7faab3b44, a21750df2f6169af6e039a3bb4893d6c9564e48d, 78a63493f8e352296dbc7cb7b3f4973105e8679e or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 53069d4e76954e2e63c1b3c501051c6fbcf7298c ≤ v < 93166bc53c0e3587058327a4121daea34b4fecd5, 53069d4e76954e2e63c1b3c501051c6fbcf7298c ≤ v < a7ee72286efba1d407c6f15a0528e43593fb7007, 53069d4e76954e2e63c1b3c501051c6fbcf7298c ≤ v < 93b1ab422f1966b71561158e1aedce4ec100f357, 53069d4e76954e2e63c1b3c501051c6fbcf7298c ≤ v < e92af7737a94a729225d2a5d180eaaa77fe0bbc1, 53069d4e76954e2e63c1b3c501051c6fbcf7298c ≤ v < aa6a21409dd6221bb268b56bb410e031c632ff9a, 53069d4e76954e2e63c1b3c501051c6fbcf7298c ≤ v < bb69928ed578f881e68d26aaf1a8f6e7faab3b44, 53069d4e76954e2e63c1b3c501051c6fbcf7298c ≤ v < a21750df2f6169af6e039a3bb4893d6c9564e48d, 53069d4e76954e2e63c1b3c501051c6fbcf7298c ≤ v < 78a63493f8e352296dbc7cb7b3f4973105e8679e, 3.0 | 93166bc53c0e3587058327a4121daea34b4fecd5, a7ee72286efba1d407c6f15a0528e43593fb7007, 93b1ab422f1966b71561158e1aedce4ec100f357, e92af7737a94a729225d2a5d180eaaa77fe0bbc1, aa6a21409dd6221bb268b56bb410e031c632ff9a, bb69928ed578f881e68d26aaf1a8f6e7faab3b44, a21750df2f6169af6e039a3bb4893d6c9564e48d, 78a63493f8e352296dbc7cb7b3f4973105e8679e |
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