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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-40233 Detail

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The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags.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


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/78a63493f8e352296dbc7cb7b3f4973105e8679e kernel.org
https://git.kernel.org/stable/c/93166bc53c0e3587058327a4121daea34b4fecd5 kernel.org
https://git.kernel.org/stable/c/93b1ab422f1966b71561158e1aedce4ec100f357 kernel.org
https://git.kernel.org/stable/c/a21750df2f6169af6e039a3bb4893d6c9564e48d kernel.org
https://git.kernel.org/stable/c/a7ee72286efba1d407c6f15a0528e43593fb7007 kernel.org
https://git.kernel.org/stable/c/aa6a21409dd6221bb268b56bb410e031c632ff9a kernel.org
https://git.kernel.org/stable/c/bb69928ed578f881e68d26aaf1a8f6e7faab3b44 kernel.org
https://git.kernel.org/stable/c/e92af7737a94a729225d2a5d180eaaa77fe0bbc1 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-40233
NVD Published Date:
12/04/2025
NVD Last Modified:
12/04/2025
Source:
kernel.org