Advisory Details

August 18th, 2022

(Pwn2Own) Linux Kernel nft_object Use-After-Free Privilege Escalation Vulnerability

ZDI-22-1118
ZDI-CAN-17470

CVE ID CVE-2022-2586
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 escalate privileges 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 handling of nft_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 root.

ADDITIONAL DETAILS Linux has issued an update to correct this vulnerability. More details can be found at:
https://seclists.org/oss-sec/2022/q3/114
DISCLOSURE TIMELINE
  • 2022-05-25 - Vulnerability reported to vendor
  • 2022-08-18 - Coordinated public release of advisory
CREDIT Team Orca of Sea Security (@seasecresponse), security.sea.com
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