CVE-2026-43066
Vulnerability Scoring
Analysis In Progress
CVE-2026-43066 Vulnerability Analysis & Exploit Details
CVE-2026-43066
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-2026-43066 Details
Status: Received on 05 May 2026, 16:16 UTC
Published on: 05 May 2026, 16:16 UTC
CVSS Release:
CVE-2026-43066 Vulnerability Summary
CVE-2026-43066: In the Linux kernel, the following vulnerability has been resolved: ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths During code review, Joseph found that ext4_fc_replay_inode() calls ext4_get_fc_inode_loc() to get the inode location, which holds a reference to iloc.bh that must be released via brelse(). However, several error paths jump to the 'out' label without releasing iloc.bh: - ext4_handle_dirty_metadata() failure - sync_dirty_buffer() failure - ext4_mark_inode_used() failure - ext4_iget() failure Fix this by introducing an 'out_brelse' label placed just before the existing 'out' label to ensure iloc.bh is always released. Additionally, make ext4_fc_replay_inode() propagate errors properly instead of always returning 0.
Assessing the Risk of CVE-2026-43066
Access Complexity Graph
The exploitability of CVE-2026-43066 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-2026-43066
No exploitability data is available for CVE-2026-43066.
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-2026-43066, 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-2026-43066, 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-2026-43066 does not compromise confidentiality.
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Integrity:
None
CVE-2026-43066 does not impact data integrity.
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Availability:
None
CVE-2026-43066 does not affect system availability.
CVE-2026-43066 References
External References
- https://git.kernel.org/stable/c/0892f12cd49fde5d5db68137923db107f894f3a3
- https://git.kernel.org/stable/c/19782b4c793b49a6aa4abbb307ddff3610009d21
- https://git.kernel.org/stable/c/5a63033696e60b5d70816f1d119645ac5b0b0a03
- https://git.kernel.org/stable/c/9c90449a9ac2cd1ba540ad2561b8b70c1bfb0a25
- https://git.kernel.org/stable/c/c426231e3d51916e83b6d1ab7ed8a65e83bca5b4
- https://git.kernel.org/stable/c/ca99cbcc316cdfd2040cc2b13d1426ccb3b3b50b
- https://git.kernel.org/stable/c/ec0a7500d8eace5b4f305fa0c594dd148f0e8d29
- https://git.kernel.org/stable/c/f7817ad399d604e8639005d87d148b5ec626ad26
CWE Common Weakness Enumeration
Unknown
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