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CVE-2025-40039: ksmbd: Fix race condition in RPC handle list access

highCVSS 7CVE-2025-40039

CSIRTS triage

vendor: Linuxproduct: ksmbdRemote code execution
What
A race condition exists in RPC handle list access in ksmbd that could allow concurrent access issues.
Who is affected
Systems running ksmbd as part of the Linux kernel.
Urgency
High severity (CVSS 7.0) and not yet exploited; patch promptly.
Action
Update to the latest kernel version containing the ksmbd RPC handle list race condition fix.

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
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40039

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-2025-40039coverage & 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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