Advisory Details

June 10th, 2024

Linux Kernel Net Scheduler Out-Of-Bounds Access Local Privilege Escalation Vulnerability

ZDI-24-593
ZDI-CAN-18568

CVE ID CVE-2023-31436
CVSS SCORE 8.2, AV:L/AC:L/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 the 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 the MTU value provided to the QFQ Scheduler. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated 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://bugzilla.redhat.com/show_bug.cgi?id=2192671
DISCLOSURE TIMELINE
  • 2022-09-14 - Vulnerability reported to vendor
  • 2024-06-10 - Coordinated public release of advisory
CREDIT Gwangun Jung at THEORI
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