CVE-2026-64387
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
In the Linux kernel, SMB client has a double-free vulnerability in query directory replay. A response-bearing attempt can free its buffer, and if SMB2_query_directory_init() fails before the next send, cleanup frees the same buffer again. The fix resets response bookkeeping before each attempt.
Risk Assessment
Double-free can cause memory corruption, system crashes, or potential exploitation for privilege escalation.
Recommendation
Update the Linux kernel to a version containing this fix to prevent double-free in SMB query directory replay.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query directory replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_directory_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free.