CVE-2026-63796

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ocfs2: reject oversized group bitmap descriptors ocfs2_validate_gd_parent() only bounds bg_bits against the parent allocator's chain geometry. A malicious descriptor can still claim a bg_size/bg_bits pair that exceeds the bitmap bytes that physically fit in the group descriptor block, so later bitmap scans and bit updates can run past bg_bitmap. Add a physical-cap check based on ocfs2_group_bitmap_size() for the parent allocator type and reject descriptors whose bg_size or bg_bits exceed that capacity. Keep the existing cha...

Affected product and versions

Product

Linux Linux, linux kernel

Affected versions

>= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 336340a0f8a141df8a4eb21a5a86f8ffb87769f6, >= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 296c6a42b1174395935ca4cfe8f393e37b698d54, >= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < d2cd59fa848f9f13796ef214d3b1b5ca9a3fe21e, >= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < c5a125eadba05ba421c4b55e68da22b4a40d32b4, >= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 8f9903b0cdbb3155a8899410330b4b4d583a7a5c, >= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 4cd57ebee395041099fcdfcabb00749ce38d8b27, >= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 99c21e7263248c3f084756bfae08163cc5d6c62f, >= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 9bd541e09dffff27e5bec0f9f45b0228173a5375, >= 2.6.16, >= 2.6.16 < 5.10.260, >= 5.11 < 5.15.211, >= 5.16 < 6.1.177, >= 6.2 < 6.6.144, >= 6.7 < 6.12.95, >= 6.13 < 6.18.38, >= 6.19 < 7.1.3

Fixed versions

5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3

Technical data

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-125