Integer overflow in Linux kernel - CVE-2026-89634
Published: September 12, 2026
Vulnerability identifier: #VU149163
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-2026-89634
CWE-ID: CWE-190
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 an integer overflow in symlink_data() in fs/smb/client/smb2file.c when processing an SMB error context with a malformed ErrorDataLength value. A remote attacker can provide a crafted SMB error context to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89634
Install security update from vendor's repository.