NULL pointer dereference in Linux kernel - CVE-2026-74633
Published: August 24, 2026
Vulnerability identifier: #VU144916
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-2026-74633
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 remove_cache_mod() in the tracing subsystem when handling crafted writes to /sys/kernel/tracing/set_event. A local user can send specially crafted event filter strings to cause a denial of service.
The issue is triggered when a module-only event filter is cached for a module that has not been loaded, and a later concatenated write attempts to remove a specific match from the same module.
Affected software
Linux kernel
How to mitigate CVE-2026-74633
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3