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CVE-2026-80638: Linux

Severity

8.8 (HIGH)

Vendor

LINUX

Affected versions

2f26f58df041bbcf692730ff4d8ab0f250d9670d through before f5255516ec7add3a6d5d37853ad5a9a9ddb14305; 2f26f58df041bbcf692730

Patch status

Patched

Published

2026-08-28T08:16:48.720

Modified

2026-08-29T07:16:47.790

Why it matters

High-severity vulnerability requiring prioritized review.

Recommended admin actions

• Review and patch based on exposure, asset criticality, and business impact.

Technical summary

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix out-of-bounds write in ocfs2_remove_refcount_extent [BUG] Unlinking a refcounted file whose refcount tree has leaf blocks triggers a fortify panic due to an out-of-bounds write. [CAUSE] When the last leaf block is removed from a refcount tree, ocfs2_remove_refcount_extent() converts the root back to leaf mode with a bulk memset on &rb->rf_records. rf_records sits in an anonymous union with rf_list. rf_list.l_tree_depth aliases rf_records.rl_count, and is 0 for a single-level tree. With rl_count equal to 0, the memset writes past the 16-byte declared size of rf_records, which the fortify checker catches. [FIX] Replace the bulk memset on &rb->rf_records with a correctly-bounded memset on rl_recs[] alone, after setting rl_count to the correct value.

View the official NVD record for CVE-2026-80638

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.