CVE-2025-40233
Vulnerability Scoring
Analysis In Progress
CVE-2025-40233 Vulnerability Analysis & Exploit Details
CVE-2025-40233
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2025-40233 Details
Status: Awaiting Analysis
Published on: 04 Dec 2025, 16:16 UTC
CVSS Release:
CVE-2025-40233 Vulnerability Summary
CVE-2025-40233: 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The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags.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.
Assessing the Risk of CVE-2025-40233
Access Complexity Graph
The exploitability of CVE-2025-40233 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2025-40233
No exploitability data is available for CVE-2025-40233.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2025-40233, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2025-40233, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2025-40233 does not compromise confidentiality.
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Integrity:
None
CVE-2025-40233 does not impact data integrity.
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Availability:
None
CVE-2025-40233 does not affect system availability.
CVE-2025-40233 References
External References
- https://git.kernel.org/stable/c/78a63493f8e352296dbc7cb7b3f4973105e8679e
- https://git.kernel.org/stable/c/93166bc53c0e3587058327a4121daea34b4fecd5
- https://git.kernel.org/stable/c/93b1ab422f1966b71561158e1aedce4ec100f357
- https://git.kernel.org/stable/c/a21750df2f6169af6e039a3bb4893d6c9564e48d
- https://git.kernel.org/stable/c/a7ee72286efba1d407c6f15a0528e43593fb7007
- https://git.kernel.org/stable/c/aa6a21409dd6221bb268b56bb410e031c632ff9a
- https://git.kernel.org/stable/c/bb69928ed578f881e68d26aaf1a8f6e7faab3b44
- https://git.kernel.org/stable/c/e92af7737a94a729225d2a5d180eaaa77fe0bbc1
CWE Common Weakness Enumeration
Unknown
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