CVE-2020-12771 Explained : Impact and Mitigation

An issue was discovered in the Linux kernel through 5.6.11. btree_gc_coalesce in drivers/md/bcache/btree.c has a deadlock if a coalescing operation fails.

Understanding CVE-2020-12771

What is CVE-2020-12771?

CVE-2020-12771 is a vulnerability found in the Linux kernel through version 5.6.11, specifically in the btree_gc_coalesce function in drivers/md/bcache/btree.c. This vulnerability can lead to a deadlock if a coalescing operation fails.

The Impact of CVE-2020-12771

This vulnerability could be exploited by an attacker to cause a denial of service (DoS) by triggering the deadlock condition, potentially leading to system instability or crashes.

Technical Details of CVE-2020-12771

Vulnerability Description

The issue lies in the btree_gc_coalesce function in drivers/md/bcache/btree.c in the Linux kernel through version 5.6.11, where a deadlock can occur if a coalescing operation fails.

Affected Systems and Versions

Linux kernel versions up to 5.6.11 are affected by this vulnerability.

Exploitation Mechanism

An attacker could exploit this vulnerability by triggering a coalescing operation failure, leading to a deadlock situation that could disrupt system functionality.

Mitigation and Prevention

Immediate Steps to Take

Apply patches provided by the Linux kernel maintainers to address this vulnerability.
Monitor official sources for updates and security advisories related to the Linux kernel.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to ensure all security patches are applied.
Implement proper security measures and access controls to mitigate the risk of exploitation.

Patching and Updates

Keep the Linux kernel up to date with the latest security patches and fixes to prevent exploitation of known vulnerabilities.