Incorrect calculation in Linux kernel - CVE-2026-89581
Published: September 12, 2026
Vulnerability identifier: #VU149224
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89581
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to incorrect register encoding in the x86 BPF JIT compiler when resolving per-CPU addresses into extended registers. A local user can execute a BPF program that uses an extended register as a per-CPU address destination to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89581
Install security update from vendor's repository.