CVE-2026-64381
Published Jul 25, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix next buffer leak in receive_encrypted_standard() receive_encrypted_standard() allocates next_buffer before checking whether the number of compound PDUs already reached MAX_COMPOUND. If the limit check fails, the function returns immediately and the newly allocated next_buffer is not assigned to server->smallbuf/server->bigbuf, making it leaked. Move the MAX_COMPOUND check before allocating next_buffer.
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EPSS — Exploit Prediction
0.0022
Probability of exploitation
0.13%
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/07e0ab81df1790afa35732a4e8e07ff831b29008
https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b
https://git.kernel.org/stable/c/297243e365fc9fe2f8e9b7dd535a65d922cd108b
https://git.kernel.org/stable/c/67097772df7791c53d608f04bd31c676ccf79b83
https://git.kernel.org/stable/c/68fc0b6cc03ca58060c0f36454e169f5fe258974
https://git.kernel.org/stable/c/9136a08dc29328edd9867f2545e73906ac9df93b
https://git.kernel.org/stable/c/927d4805aea0a287d36dd4f826ee24d69a2afee3
https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8
Frequently Asked Questions
What is CVE-2026-64381? +
In the Linux kernel, the following vulnerability has been resolved:
smb: client: Fix next buffer leak in receive_encrypted_standard()
receive_encrypted_standard() allocates next_buffer before checking
whether the number of compound PDUs already reached MAX_COMPOUND. If
the limit check fails, the function returns immediately and the newly
allocated next_buffer is not assigned to server->smallbuf/server->bigbuf,
making it leaked.
Move the MAX_COMPOUND check before allocating next_buffer.
How do I check if I'm vulnerable to CVE-2026-64381? +
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.