Memory leak in Linux kernel - CVE-2026-31610
Published: April 25, 2026
Vulnerability identifier: #VU127782
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-31610
CWE-ID: CWE-401
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a memory leak in smb2_sess_setup() SPNEGO negotiation handling when processing a malformed SPNEGO negotiation token. A remote attacker can send a specially crafted negotiation blob to cause a denial of service.
The issue is reachable pre-authentication, and malformed later elements in the same token can leave an allocated mechToken uncleared after both SPNEGO grammars fail.
How to mitigate CVE-2026-31610
Install security update from vendor's repository.