Advisory Details

July 30th, 2025

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

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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