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

criticalCVSS 9.8CVE-2026-53309

CSIRTS triage

Privilege escalation
What
An off-by-one error in region comparison can lead to privilege escalation.
Who is affected
Deployments using ocfs2/dlm are affected.
Urgency
Remediation is critical due to the high severity and potential for exploitation.
Action
Patch the affected systems immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.8
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53309

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-53309coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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