CVE-2022-41849 : Exploit Details and Defense Strategies

A race condition in the Linux kernel through version 5.19.12 has been identified, leading to a use-after-free vulnerability when a physically proximate attacker removes a USB device while calling open(). This results in a race condition between ufx_ops_open and ufx_usb_disconnect.

Understanding CVE-2022-41849

This section provides insights into the nature, impact, and technical details of the CVE-2022-41849 vulnerability.

What is CVE-2022-41849?

The CVE-2022-41849 vulnerability involves a race condition in drivers/video/fbdev/smscufx.c in the Linux kernel, potentially allowing a physically proximate attacker to trigger a use-after-free flaw by removing a USB device during an open() call.

The Impact of CVE-2022-41849

The impact of this vulnerability includes the risk of a use-after-free scenario, leading to potential exploitation by attackers with physical access to the system, causing instability and potential system compromise.

Technical Details of CVE-2022-41849

Explore the specifics of the vulnerability, including the affected systems, exploitation mechanism, and recommended mitigation strategies.

Vulnerability Description

The vulnerability arises from a race condition in the ufx_ops_open and ufx_usb_disconnect functions within the Linux kernel, which can be triggered by removing a USB device during a specific system call.

Affected Systems and Versions

All versions of the Linux kernel through 5.19.12 are affected by CVE-2022-41849 due to the identified race condition in the smscufx.c driver for video framebuffer devices.

Exploitation Mechanism

A physically proximate attacker can exploit this vulnerability by removing a USB device at a precise moment during the open() call, causing a race condition that leads to a use-after-free scenario.

Mitigation and Prevention

Discover the immediate steps to secure systems against CVE-2022-41849 and implement long-term security practices.

Immediate Steps to Take

To mitigate the risk posed by CVE-2022-41849, users are advised to apply the latest security updates for the Linux kernel and consider physical security measures to prevent unauthorized access to USB devices.

Long-Term Security Practices

Implementing security best practices, such as regular patch management, access control measures, and security awareness training, can bolster the overall resilience of systems against known and emerging vulnerabilities.

Patching and Updates

Stay informed about security updates released by the Linux kernel maintainers and promptly apply patches to address CVE-2022-41849 and other related vulnerabilities.