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CVE-2026-64381: smb: client: Fix next buffer leak in receive_encrypted_standard()

mediumCVSS 6.5CVE-2026-64381

CSIRTS triage

vendor: Linuxproduct: SMB ClientInformation disclosure
What
A next buffer leak occurs in receive_encrypted_standard().
Who is affected
Deployments using the SMB client.
Urgency
Remediation is important to prevent potential information leaks, but no exploitation is reported.
Action
Update the SMB client to the latest version.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 6.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64381

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-2026-64381coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for smb

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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