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CVE-2026-64395: ksmbd: require source read access for duplicate extents

highCVSS 7.1CVE-2026-64395

CSIRTS triage

vendor: Linuxproduct: ksmbdOther
What
The ksmbd server requires source read access for duplicate extents to prevent unauthorized access.
Who is affected
Deployments using the ksmbd SMB server.
Urgency
Remediation is necessary to ensure proper access controls, with no known exploits at this time.
Action
Update the ksmbd server to the latest 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
high — CVSS 7.1
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64395

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-2026-64395coverage & 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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