Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-06-26T00:00:00 kernel: ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison 7.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L CWE-125

In the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison The local-vs-remote region comparison loop uses '<=' instead of '<', causing it to read one entry past the valid range of qr_regions. The other loops in the same function correctly use '<'. Fix the loop condition to use '<' for consistency and correctness.

A flaw was found in the Linux kernel's OCFS2 Distributed Lock Manager (DLM) component. An off-by-one error in the `dlm_match_regions()` function's region comparison loop causes it to read beyond the valid memory range of `qr_regions`. This out-of-bounds read could lead to system instability or crashes.

Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53309 https://nvd.nist.gov/vuln/detail/CVE-2026-53309 https://lore.kernel.org/linux-cve-announce/2026062620-CVE-2026-53309-794d@gregkh/T