Out-of-bounds read in Linux kernel - CVE-2026-89794
Published: September 17, 2026
Vulnerability identifier: #VU150485
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-2026-89794
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose uninitialized kernel heap memory.
The vulnerability exists due to an out-of-bounds read in the ksmbd smb2_read_pipe() function when handling compound SMB pipe read responses. A remote attacker can issue an SMB pipe read request that causes alignment padding to be included in a response to disclose uninitialized kernel heap memory.
Affected software
Linux kernel
How to mitigate CVE-2026-89794
Install security update from vendor's repository.