CVE-2026-80881
N/AIn the Linux kernel, the following vulnerability has been resolved: ocfs2: fix buffer head management in ocfs2_read_blocks() In ocfs2_read_blocks(), caller should't assume that buffer head returned by 'sb_getblk()' is exclusively owned and so 'put_bh()' always drops b_count from 1 to 0. If it is not so, buffer head remains on hold and likely to be returned by the next call to 'sb_getblk()' unchanged - that is, with BH_Uptodate bit set even if it has failed validation previously, thus allowing to insert that buffer head into OCFS2 metadata cache and submit it to upper layers. To avoid such a scenario, BH_Uptodate should be cleared immediately after 'validate()' callback has detected some data inconsistency.
No known exploitation, public exploit, or elevated probability at this time. Track for changes.
Exploitation likelihood
—EPSS not yet scored
Impact if exploited
—CVSS · not scored
- No impact metrics
Proof of concept & exploit code
- github-search Search GitHub for public PoC repos
Test against your own equipment
curl -s https://vulnpedia.com/cve/CVE-2026-80881/poc.jsonMachine-readable PoC index for this CVE (for automation).Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-80881/poc.json
References
Technical & other
- https://git.kernel.org/stable/c/a4eae1499c760949a93459d11390bd1fd823d31d
- https://git.kernel.org/stable/c/4ab17e328522a4df5fe0f0dcf39098118b1feeaa
- https://git.kernel.org/stable/c/5927acb3e2c99985a14adecd9d1b67ba191c622d
- https://git.kernel.org/stable/c/ecb3f9386f4353034caef77239473c627232db17
- https://git.kernel.org/stable/c/61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766
- https://git.kernel.org/stable/c/0e389fc290c350c67591abf4c367119f4689f310
- https://git.kernel.org/stable/c/9e7a057934cdd58e4cc94350bcfe5367bbee0f8e
- https://git.kernel.org/stable/c/6371a07148ee979af22a9d6f4c277462953a9a4a