CVE-2026-80881

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CVE-2026-80881

Summary: ocfs2: fix buffer head management in ocfs2_read_blocks()

Details: In 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.

References: https://git.kernel.org/stable/c/0e389fc290c350c67591abf4c367119f4689f310, https://git.kernel.org/stable/c/4ab17e328522a4df5fe0f0dcf39098118b1feeaa, https://git.kernel.org/stable/c/5927acb3e2c99985a14adecd9d1b67ba191c622d, https://git.kernel.org/stable/c/61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766, https://git.kernel.org/stable/c/6371a07148ee979af22a9d6f4c277462953a9a4a, https://git.kernel.org/stable/c/9e7a057934cdd58e4cc94350bcfe5367bbee0f8e, https://git.kernel.org/stable/c/a4eae1499c760949a93459d11390bd1fd823d31d, https://git.kernel.org/stable/c/ecb3f9386f4353034caef77239473c627232db17, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80881.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80881, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git