CVE-2026-64390
Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. https://security-tracker.debian.org/tracker/DSA-6405-1
CSIRTS triage
- What
- The ksmbd service needs to track the connection owning a byte-range lock.
- Who is affected
- Deployments using ksmbd are affected.
- Urgency
- Remediation is necessary to ensure proper functionality, although exploitation status is currently unknown.
- Action
- Implement the fix for CVE-2026-64390.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.
Advisory coverage (3)
- unknownDSA-6405-1 linux - security updatedebian · 2026-07-31
- highCVE-2026-64390: In the Linux kernel, the following vulnerability has been resolved: ksmbd: track the connectio…nvd · 2026-07-25
- mediumCVE-2026-64390: ksmbd: track the connection owning a byte-range lockmsrc · 2026-07-14
External references
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