What’s Vulnerable › Vulnerabilities

CVE-2026-53309: ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-26 · updated 2026-07-06
• Weakness: CWE-193

Description

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.

Affected products

• Linux kernel: from 2.6.37 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33 — fixed in 5.10.258, 5.15.209, 6.1.175, 6.12.91, 6.18.33, 6.6.141

How to fix

Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 6.1.175, 6.12.91. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/01b61e8dda9b0fdb0d4cda43de25f4e390554d7b
• https://git.kernel.org/stable/c/1fb7f356547d9688822315cd2b205ff0bd5429b4
• https://git.kernel.org/stable/c/2a0673836f019e7c032acbf48d022d5ccf02a845
• https://git.kernel.org/stable/c/426cd8eedac89b86148d4478990eeef16e8a2520
• https://git.kernel.org/stable/c/760ab35040aca8399021fdb9ff1db1089feb7194
• https://git.kernel.org/stable/c/819d8ebad3200a53de99bd7e297bc428e41ced54
• https://git.kernel.org/stable/c/c60a2710b73838d250cda57344c049b89abc5d52
• https://git.kernel.org/stable/c/d5403ae28085761d58b555645bc7d5feadb10073

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