CVE-2026-64016
A critical flaw in the Linux kernel’s SMB daemon (ksmbd) can cause improper cleanup of file objects after a durable reconnect, potentially leading to resource leaks or inconsistent state. The issue was fixed in a kernel update that corrects the file lifetime handling during reconnects.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux systems that run the kernel with the ksmbd service before the fix was applied. This includes servers and desktops that use SMB file sharing.
Real-world impact
An attacker could exploit the flaw to cause a denial‑of‑service by exhausting kernel resources or corrupting file handles, which would destabilize the system and disrupt file sharing services.
Why this severity
The CVSS score of 9.8 reflects the vulnerability’s high impact on confidentiality, integrity, and availability, and the fact that it can be exploited remotely with no authentication or user interaction.
What to do about it
- 01Upgrade your Linux kernel to a version that includes the ksmbd durable reconnect error path fix.
- 02Reboot the system to load the new kernel.
NVD-referenced vendor advisory
Timeline
- Jul 19, 2026 · 14d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 20, 2026 · 13d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
- Jul 30, 2026 · 3d agoAdvisory updatedThe NVD record was last revised.