Linux Kernel Net Scheduler Packet Classifier API Time-Of-Check Time-Of-Use Local Privilege Escalation Vulnerability

August 13th, 2026
ZDI-26-575 ZDI-CAN-31419

CVE ID

CVSS Score

7.5 AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected Vendors

Linux

Affected Products

Kernel

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 traffic classifier. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to escalate privileges and execute 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/8b519cbcabe836a441369fbec1a8a6518a709251

Disclosure Timeline

  • 2026-06-25 - Vulnerability reported to vendor
  • 2026-08-13 - Coordinated public release of advisory
  • 2026-08-13 - Advisory Updated

Credit

@TristanInSec

Back to Advisories