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CVE-2026-64598: smb/client: Fix error code in smb2_aead_req_alloc()

mediumCVSS 5.5CVE-2026-64598

CSIRTS triage

vendor: Linuxproduct: Linux kernelOther
What
An error code handling issue in smb2_aead_req_alloc() in the SMB client subsystem can cause incorrect error reporting.
Who is affected
Linux systems running the SMB client code.
Urgency
Medium priority; unexcploited and no indication of real-world impact.
Action
Apply kernel patch when available via your distribution.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64598

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-2026-64598coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for smb/client

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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