CVE-2026-64387
Published Jul 25, 2026
Description
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.
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EPSS — Exploit Prediction
0.0021
Probability of exploitation
0.11%
Percentile rank
EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.
References
Other References
https://git.kernel.org/stable/c/00b0fa425941438b664950a8ee65dfba2def4336
https://git.kernel.org/stable/c/1665f25b1dea30bf2d02e16245d203a944c9d994
https://git.kernel.org/stable/c/3317a5d015fca976475aa71df224056777316fde
https://git.kernel.org/stable/c/3409aedf3c81a810243da94164f6621c9d205c98
https://git.kernel.org/stable/c/9647492b5e41954be59d5157eddbcd4cdc1656f7
Frequently Asked Questions
What is CVE-2026-64387? +
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.
How do I check if I'm vulnerable to CVE-2026-64387? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.