CVE-2026-53309
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
In the Linux kernel, an off-by-one vulnerability was found in the OCFS2 filesystem's dlm_match_regions() function. The local-vs-remote region comparison loop uses '<=' instead of '<', causing it to read one entry past the valid range of the qr_regions array. Other loops in the same function correctly use '<'.
Risk Assessment
The risk involves potential out-of-bounds memory read, which could lead to unexpected system behavior, information disclosure, or kernel panic. This vulnerability affects the OCFS2 clustering component used in shared file access environments.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit correcting the loop condition). Monitor official security advisories from your Linux distribution for the appropriate patch.
Original NVD description (English source)
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.