Out-of-bounds read in Linux kernel - CVE-2026-99275
Published: November 8, 2026
Vulnerability identifier: #VU161906
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99275
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information from Linux kernel memory.
The vulnerability exists due to an out-of-bounds read in the Linux kernel SMB client's session setup handling when processing truncated SMB2 authentication responses. A remote attacker can send a crafted 64-byte STATUS_MORE_PROCESSING_REQUIRED SESSION_SETUP response from a malicious SMB server, causing security buffer fields to be read from stale receive-buffer contents and potentially causing up to about 64 KB of memory beyond the receive object to be returned to the server in NTLMv2 AUTHENTICATE target information.
Affected software
Linux kernel
How to mitigate CVE-2026-99275
Install security update from vendor's repository.