CVE-2026-23234
Vulnerability Scoring
Analysis In Progress
CVE-2026-23234 Vulnerability Analysis & Exploit Details
CVE-2026-23234
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-2026-23234 Details
Status: Received on 04 Mar 2026, 15:16 UTC
Published on: 04 Mar 2026, 15:16 UTC
CVSS Release:
CVE-2026-23234 Vulnerability Summary
CVE-2026-23234: In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid UAF in f2fs_write_end_io() As syzbot reported an use-after-free issue in f2fs_write_end_io(). It is caused by below race condition: loop device umount - worker_thread - loop_process_work - do_req_filebacked - lo_rw_aio - lo_rw_aio_complete - blk_mq_end_request - blk_update_request - f2fs_write_end_io - dec_page_count - folio_end_writeback - kill_f2fs_super - kill_block_super - f2fs_put_super : free(sbi) : get_pages(, F2FS_WB_CP_DATA) accessed sbi which is freed In kill_f2fs_super(), we will drop all page caches of f2fs inodes before call free(sbi), it guarantee that all folios should end its writeback, so it should be safe to access sbi before last folio_end_writeback(). Let's relocate ckpt thread wakeup flow before folio_end_writeback() to resolve this issue.
Assessing the Risk of CVE-2026-23234
Access Complexity Graph
The exploitability of CVE-2026-23234 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-2026-23234
No exploitability data is available for CVE-2026-23234.
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-2026-23234, 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-2026-23234, 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-2026-23234 does not compromise confidentiality.
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Integrity:
None
CVE-2026-23234 does not impact data integrity.
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Availability:
None
CVE-2026-23234 does not affect system availability.
CVE-2026-23234 References
External References
- https://git.kernel.org/stable/c/0fb58aff0dafd6837cc91f4154f3ed6e020358fa
- https://git.kernel.org/stable/c/2f67ff1e15a8a4d0e4ffc6564ab20d03d7398fe9
- https://git.kernel.org/stable/c/505e1c0530db6152cab3feef8e3e4da3d3e358c9
- https://git.kernel.org/stable/c/995030be4ce6338c6ff814583c14166446a64008
- https://git.kernel.org/stable/c/a42f99be8a16b32a0bb91bb6dda212a6ad61be5d
- https://git.kernel.org/stable/c/acc2c97fc0005846e5cf11b5ba3189fef130c9b3
- https://git.kernel.org/stable/c/ce2739e482bce8d2c014d76c4531c877f382aa54
- https://git.kernel.org/stable/c/cf4a9e1bc8129eb63fda5f8bdcd8d87f0bd76f42
CWE Common Weakness Enumeration
Unknown
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