Out-of-bounds write in Linux kernel - CVE-2026-89494
Published: September 12, 2026
Vulnerability identifier: #VU149310
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89494
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause memory corruption.
The vulnerability exists due to a heap out-of-bounds write in dlm_init_lockres() when processing a DLM_MIG_LOCKRES message with an oversized lock name length. A remote user can send a specially crafted DLM_MIG_LOCKRES message to cause memory corruption.
The sending node must belong to the DLM domain.
Affected software
Linux kernel
How to mitigate CVE-2026-89494
Install security update from vendor's repository.