CVE-2021-30547

CVE-2021-30547 is a vulnerability that was identified in the Linux kernel. Specifically, it affects the kernel's implementation of the Berkeley Packet Filter (BPF), a feature used for network filtering and monitoring. The vulnerability allows an attacker to exploit a flaw in the BPF code to gain elevated privileges on a targeted system. This could potentially allow the attacker to execute arbitrary code or cause a denial-of-service attack. The vulnerability was publicly disclosed on May 18, 2021, by security researchers at Qualys. It was given a CVSS score of 8.6 out of 10, indicating a high severity level. The vulnerability affects multiple versions of the Linux kernel, including versions 5.11 and earlier. In response to the vulnerability, patches were quickly developed and released by the Linux kernel maintainers. System administrators were advised to update their systems as soon as possible to ensure they were protected against potential attacks. While there have not been any reported instances of this vulnerability being actively exploited in the wild, it serves as a reminder of the importance of promptly addressing known vulnerabilities to prevent potential attacks.