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CVE-2026-64398: ksmbd: add a permission check for FSCTL_SET_ZERO_DATA

mediumCVSS 5.5CVE-2026-64398

CSIRTS triage

Other
What
A permission check is missing for FSCTL_SET_ZERO_DATA in the ksmbd driver.
Who is affected
Affected systems using the ksmbd driver.
Urgency
The urgency is unclear due to unknown severity.
Action
Monitor for updates regarding this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64398

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-2026-64398coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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