NULL pointer dereference in Linux kernel - CVE-2026-80689
Published: August 28, 2026
Vulnerability identifier: #VU146107
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-2026-80689
CWE-ID: CWE-476
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 a NULL pointer dereference in the mmiotrace logging functions __trace_mmiotrace_rw() and __trace_mmiotrace_map() when handling mmiotrace events while mmio_trace_array is NULL. A local user can trigger the affected tracing functionality to cause a denial of service.
This can occur before initialization or after the tracing facility has been disabled.
Affected software
Linux kernel
How to mitigate CVE-2026-80689
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3