Advisory Details

July 24th, 2025

(Pwn2Own) Red Hat Enterprise Linux CBS Packet Scheduling Use-After-Free Local Privilege Escalation Vulnerability

ZDI-25-651
ZDI-CAN-27159

CVE ID CVE-2025-38350
CVSS SCORE 8.8, AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS Red Hat
AFFECTED PRODUCTS Enterprise Linux
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Red Hat Enterprise Linux. 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 handling of hfsc_class 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 Red Hat has issued an update to correct this vulnerability. More details can be found at:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=103406b38c600fec1fe375a77b27d87e314aea09
DISCLOSURE TIMELINE
  • 2025-05-29 - Vulnerability reported to vendor
  • 2025-07-24 - Coordinated public release of advisory
  • 2025-07-24 - Advisory Updated
CREDIT Gerrard Tai of STAR Labs SG Pte. Ltd.
BACK TO ADVISORIES