CVE-2026-80881: Linux

EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux: from 4.4.204, before 4.5 (fixed in 4.5); from 4.9.204, before 4.10 (fixed in 4.10); from 4.14.157, before 4.15 (fixed in 4.15); from 4.19.87, before 4.20 (fixed in 4.20); from 4.20, before 5.10.261 (fixed in 5.10.261); from 5.11, before 5.15.212 (fixed in 5.15.212); …

Published 2026-09-04. Last modified 2026-09-04.