CVE-2026-64387
A critical double‑free bug was found in the Linux kernel’s SMB client. The flaw can be triggered when a directory query fails and the kernel frees the same memory twice. The issue has been fixed in the kernel source.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel SMB client, any system running a kernel version before the fix.
Real-world impact
If exploited, an attacker could crash the system or execute arbitrary code by causing a double‑free in the SMB client.
Why this severity
The CVSS score of 9.8 reflects that the vulnerability is exploitable over the network with no authentication, no user interaction, and can lead to complete compromise of confidentiality, integrity, and availability.
What to do about it
- 01Upgrade the Linux kernel to a version that includes the fix for the SMB client double‑free bug.
- 02Reboot the system to load the updated kernel.
NVD-referenced vendor advisory
Timeline
- Jul 25, 2026 · 7d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 27, 2026 · 5d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.