CVE-2025-40233

ocfs2: clear extent cache after moving/defragmenting extents

State: Published
Severity: 7.8 High
Published: Dec 4, 2025
Updated: Aug 5, 2026
Reserved: Apr 16, 2025

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The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags.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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	53069d4e76954e2e63c1b3c501051c6fbcf7298c to before 93166bc53c0e3587058327a4121daea34b4fecd5Affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c to before a7ee72286efba1d407c6f15a0528e43593fb7007Affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c to before 93b1ab422f1966b71561158e1aedce4ec100f357Affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c to before e92af7737a94a729225d2a5d180eaaa77fe0bbc1Affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c to before aa6a21409dd6221bb268b56bb410e031c632ff9aAffected 53069d4e76954e2e63c1b3c501051c6fbcf7298c to before bb69928ed578f881e68d26aaf1a8f6e7faab3b44Affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c to before a21750df2f6169af6e039a3bb4893d6c9564e48dAffected 53069d4e76954e2e63c1b3c501051c6fbcf7298c to before 78a63493f8e352296dbc7cb7b3f4973105e8679eAffected
LinuxLinux	3.0Affected before 3.0Not affected 5.4.301 through 5.4.Not affected 5.10.246 through 5.10.Not affected 5.15.196 through 5.15.Not affected 6.1.158 through 6.1.Not affected 6.6.115 through 6.6.Not affected 6.12.56 through 6.12.Not affected 6.17.6 through 6.17.*Not affected 6.18 and laterNot affected

Product

Versions

LinuxLinux

53069d4e76954e2e63c1b3c501051c6fbcf7298c to before 93166bc53c0e3587058327a4121daea34b4fecd5Affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c to before a7ee72286efba1d407c6f15a0528e43593fb7007Affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c to before 93b1ab422f1966b71561158e1aedce4ec100f357Affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c to before e92af7737a94a729225d2a5d180eaaa77fe0bbc1Affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c to before aa6a21409dd6221bb268b56bb410e031c632ff9aAffected
53069d4e76954e2e63c1b3c501051c6fbcf7298c to before bb69928ed578f881e68d26aaf1a8f6e7faab3b44Affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c to before a21750df2f6169af6e039a3bb4893d6c9564e48dAffected
53069d4e76954e2e63c1b3c501051c6fbcf7298c to before 78a63493f8e352296dbc7cb7b3f4973105e8679eAffected

LinuxLinux

3.0Affected
before 3.0Not affected
5.4.301 through 5.4.*Not affected
5.10.246 through 5.10.*Not affected
5.15.196 through 5.15.*Not affected
6.1.158 through 6.1.*Not affected
6.6.115 through 6.6.*Not affected
6.12.56 through 6.12.*Not affected
6.17.6 through 6.17.*Not affected
6.18 and laterNot affected

References

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