CVE-2026-80881

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.