CVE-2021-47508

Name of the Vulnerable Software and Affected Versions: Linux kernel (affected versions not specified)

Description: The issue is related to a memory leak in the btrfs component of the Linux kernel. When btrfs qgroup reserve data() or btrfs delalloc reserve metadata() fail, the allocated extent changeset is not freed, leading to a memory leak. This issue only occurs in the direct IO write path, specifically after a certain commit (65b3c08606e5) that fixed an ENOSPC failure when attempting direct IO write into a NOCOW range, and also at defrag one locked target(). The memory leak can cause problems, but the exact impact is not specified.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.