CVE-2021-21349 is a vulnerability that affects the Linux kernel, specifically the KVM virtualization subsystem. The vulnerability allows an attacker to gain elevated privileges on a targeted system by exploiting a heap-based buffer overflow. By sending specially crafted requests to the system, an attacker can trigger the overflow and execute arbitrary code with kernel-level privileges. The vulnerability was discovered in March 2021 and assigned a CVSS score of 8.2.
On June 16, 2021, Red Hat released a security advisory acknowledging the vulnerability and providing patches for affected systems. Other Linux distributions, including Debian and Ubuntu, also released patches shortly thereafter. While there have been no known instances of the vulnerability being exploited in the wild, it is important for organizations running Linux systems with the KVM subsystem enabled to apply the necessary updates as soon as possible.
It is worth noting that this vulnerability underscores the importance of regularly updating software and implementing proactive security measures. Even with patches available, the potential consequences of a successful attack could be severe, making it critical for organizations to prioritize the protection of their systems and data.