Untrusted Pointer Dereference in Linux kernel - CVE-2026-89489
Published: September 12, 2026
Vulnerability identifier: #VU149322
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89489
CWE-ID: CWE-822
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute arbitrary code in kernel context.
The vulnerability exists due to improper validation of user pointers in the sys_or1k_atomic syscall when processing syscall arguments. A local user can supply kernel addresses as syscall pointers to execute arbitrary code in kernel context.
Affected software
Linux kernel
How to mitigate CVE-2026-89489
Install security update from vendor's repository.