Linux Kernel Net Scheduler Clsact Qdisc Use-After-Free Local Privilege Escalation Vulnerability
Vulnerability Details
This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the handling of tcx_entry objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel.
Additional Details
Linux has issued an update to correct this vulnerability. More details can be found at:
https://github.com/torvalds/linux/commit/5258572aa5fd5a7ed01b123b28241e0281b6fb9b
Disclosure Timeline
- 2026-02-12 - Vulnerability reported to vendor
- 2026-09-14 - Coordinated public release of advisory
- 2026-09-14 - Advisory Updated
Credit
p0ch1ta and sh4dy
