CVE-2021-47564

Name of the Vulnerable Software and Affected Versions: Linux kernel version 5.15.0

Description: The issue is related to a double free error in the prestera driver of the Linux kernel. This error can cause the driver to crash. The problem is specifically with the prestera bridge port join() function, which handles error paths. The crash occurs due to an internal error, as indicated by the "Oops" message, and involves the prestera bridge destroy() function. The estimated number of potentially affected devices and details about real-world incidents are not provided.

Recommendations: To resolve the issue, update the Linux kernel to a version that includes the fix for the double free issue in the prestera driver. As a temporary workaround, consider disabling the prestera bridge port join() function until a patch is available. Restrict access to the vulnerable prestera module to minimize the risk of exploitation.