NULL pointer dereference in Linux kernel - CVE-2026-53328
Published: July 2, 2026
Vulnerability identifier: #VU136724
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-53328
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper handling of a NULL pointer state in scx_cgroup_move_task() when processing cgroup migration events under a sched_ext scheduler. A local user can trigger cgroup subtree_control changes to cause a kernel warning and destabilize the system.
The issue occurs when migration is driven by css identity rather than cgroup identity, allowing a legitimate css-only migration to reach the function with cgrp_moving_from unset.
How to mitigate CVE-2026-53328
Install security update from vendor's repository.