NULL pointer dereference in Linux kernel - CVE-2026-64451
Published: July 27, 2026
Vulnerability identifier: #VU139481
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-2026-64451
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 func_set_flag() in the tracing subsystem when writing to a function tracer option file after the active tracer has been switched to a different tracer. A local user can write to the option file in that state to cause a denial of service.
The issue is triggered when a process keeps a function tracer option file open and the current tracer is changed before a subsequent write occurs.
Affected software
Linux kernel
How to mitigate CVE-2026-64451
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3