Out-of-bounds read in Linux kernel - CVE-2026-68431
Published: August 12, 2026
Vulnerability identifier: #VU141604
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-68431
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.
The vulnerability exists due to an out-of-bounds read in ksmbd connection request handling when processing short SMB2 transform requests on an SMB 2.1 connection. A remote attacker can send a specially crafted truncated transform packet to disclose sensitive information.
The issue occurs when a transform packet is accepted even though the negotiated dialect does not provide transform handling.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-68431
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1