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CVE-2026-64393: ksmbd: run set info with opener credentials

highCVSS 7.8CVE-2026-64393

CSIRTS triage

vendor: Linuxproduct: ksmbdOther
What
The ksmbd service runs set info with opener credentials, which may lead to vulnerabilities.
Who is affected
Deployments of the ksmbd service are affected.
Urgency
Remediation is necessary to prevent potential exploitation, although exploitation status is currently unknown.
Action
Update to the latest version of the ksmbd service.

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
high — CVSS 7.8
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64393

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-2026-64393coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for ksmbd

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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