CVE-2026-80527: ceph: fix hanging __ceph_get_caps() with stale mds_wanted

mediumCVSS 5.5CVE-2026-80527

CSIRTS triage

vendor: Ceph product: Ceph Denial of service

What: The Ceph filesystem's __ceph_get_caps() function can hang indefinitely when encountering stale mds_wanted state.
Who is affected: Ceph deployments running affected versions.
Urgency: Medium priority; denial of service condition affecting cluster availability, not yet exploited.
Action: Apply Ceph security patch or upgrade to fixed version.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80527

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.

Low exploitation riskCVE-2026-805270.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-80527	coverage & exploitation status	NVD · CVE.org

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