(Pwn2Own) Canonical Ubuntu Kernel taprio Scheduler Race Condition Local Privilege Escalation Vulnerability

July 30th, 2025
ZDI-25-729 ZDI-CAN-23656

CVE ID

CVE-2024-50126

CVSS Score

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

Affected Vendors

Canonical

Affected Products

Ubuntu

Vulnerability Details

This vulnerability allows local attackers to escalate privileges on affected installations of Canonical Ubuntu. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the taprio scheduler. 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 arbitrary code in the context of the kernel.

Additional Details

Canonical has issued an update to correct this vulnerability. More details can be found at:
https://ubuntu.com/security/CVE-2024-50126

Disclosure Timeline

  • 2024-04-24 - Vulnerability reported to vendor
  • 2025-07-30 - Coordinated public release of advisory
  • 2025-07-30 - Advisory Updated

Credit

Kyle Zeng from ASU SEFCOM

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