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Review reviewHigh

CVE-2025-40233

Linux

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The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags.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

CVSS
7.8
EPSS
0.15%
4.79% percentile
CISA KEV
Not listed
Published
2025.12.05
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.15%
Technical severityCVSS 7.8

Vulnerability overview

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The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags.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

Affected product and versions

Product
Linux
Affected versions
>= 53069d4e76954e2e63c1b3c501051c6fbcf7298c < 93166bc53c0e3587058327a4121daea34b4fecd5, >= 53069d4e76954e2e63c1b3c501051c6fbcf7298c < a7ee72286efba1d407c6f15a0528e43593fb7007, >= 53069d4e76954e2e63c1b3c501051c6fbcf7298c < 93b1ab422f1966b71561158e1aedce4ec100f357, >= 53069d4e76954e2e63c1b3c501051c6fbcf7298c < e92af7737a94a729225d2a5d180eaaa77fe0bbc1, >= 53069d4e76954e2e63c1b3c501051c6fbcf7298c < aa6a21409dd6221bb268b56bb410e031c632ff9a, >= 53069d4e76954e2e63c1b3c501051c6fbcf7298c < bb69928ed578f881e68d26aaf1a8f6e7faab3b44, >= 53069d4e76954e2e63c1b3c501051c6fbcf7298c < a21750df2f6169af6e039a3bb4893d6c9564e48d, >= 53069d4e76954e2e63c1b3c501051c6fbcf7298c < 78a63493f8e352296dbc7cb7b3f4973105e8679e, >= 3.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-40233 — Linux | SECUFOCUS NOW