Memory leak in Linux kernel - CVE-2026-64381
Published: July 27, 2026
Vulnerability identifier: #VU139585
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64381
CWE-ID: CWE-401
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a memory leak in receive_encrypted_standard() when processing compound SMB PDUs. A remote attacker can send compound SMB messages that exceed MAX_COMPOUND to cause a denial of service.
The issue affects the Linux kernel SMB client.
Affected software
Linux kernel
How to mitigate CVE-2026-64381
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External 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