CVE-2022-47946 Explained : Impact and Mitigation

An issue was discovered in the Linux kernel 5.10.x before 5.10.155. A use-after-free vulnerability in io_sqpoll_wait_sq in fs/io_uring.c allows an attacker to crash the kernel, leading to denial of service by skipping the finish_wait function. Attackers can exploit this vulnerability by forking a process and quickly terminating it.

Understanding CVE-2022-47946

This section provides insights into the details and impact of CVE-2022-47946.

What is CVE-2022-47946?

CVE-2022-47946 is a use-after-free vulnerability in the Linux kernel 5.10.x before 5.10.155. It exists in the io_sqpoll_wait_sq function in fs/io_uring.c, allowing an attacker to crash the kernel and trigger a denial of service condition.

The Impact of CVE-2022-47946

The vulnerability can be exploited to crash the kernel, potentially resulting in a denial of service (DoS) condition. By leveraging this flaw, attackers can skip the finish_wait function, leading to instability and service disruption.

Technical Details of CVE-2022-47946

Delve deeper into the technical aspects of the vulnerability.

Vulnerability Description

A use-after-free issue in io_sqpoll_wait_sq in fs/io_uring.c in Linux kernel 5.10.x before 5.10.155 allows an attacker to crash the kernel, facilitating a DoS attack.

Affected Systems and Versions

All systems running Linux kernel 5.10.x before version 5.10.155 are vulnerable to CVE-2022-47946.

Exploitation Mechanism

Attackers can exploit this vulnerability by forking a process and quickly terminating it, triggering the use-after-free condition in io_sqpoll_wait_sq.

Mitigation and Prevention

Learn about the steps to mitigate the impact of CVE-2022-47946.

Immediate Steps to Take

Update to Linux kernel version 5.10.155 or higher to patch the vulnerability.
Monitor system logs for any suspicious activities or crash reports.

Long-Term Security Practices

Implement security best practices to prevent unauthorized access to critical systems.
Conduct regular security audits and vulnerability assessments.

Patching and Updates

Stay informed about security updates for the Linux kernel and promptly apply patches to address known vulnerabilities.