Advisory Details

January 9th, 2024

Linux Kernel GSM Multiplexing Race Condition Local Privilege Escalation Vulnerability

ZDI-24-020
ZDI-CAN-20527

CVE ID CVE-2023-6546
CVSS SCORE 8.8, AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS Linux
AFFECTED PRODUCTS Kernel
VULNERABILITY DETAILS

This vulnerability allows local attackers to execute arbitrary code on affected installations of Linux Kernel. 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 n_gsm driver. 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/3c4f8333b582487a2d1e02171f1465531cde53e3
DISCLOSURE TIMELINE
  • 2023-04-06 - Vulnerability reported to vendor
  • 2024-01-09 - Coordinated public release of advisory
  • 2024-07-01 - Advisory Updated
CREDIT Nassim Asrir
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