(Pwn2Own) Linux Kernel io_uring Buffer List Race Condition Local Privilege Escalation Vulnerability

July 29th, 2024
ZDI-24-1018 ZDI-CAN-23851

CVE ID

CVE-2024-35880

CVSS Score

7.8 AV:L/AC:H/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 the io_uring buffer list. 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

Linux has issued an update to correct this vulnerability. More details can be found at:
https://lore.kernel.org/linux-cve-announce/2024051944-CVE-2024-35880-6ffb@gregkh/#r

Disclosure Timeline

  • 2024-04-02 - Vulnerability reported to vendor
  • 2024-07-29 - Coordinated public release of advisory
  • 2024-08-15 - Advisory Updated

Credit

Billy Jheng Bing-Jhong, Đỗ Minh Tuấn, Muhammad Alifa Ramdhan

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