Threats tagged 'ghsa-f349-gqv8-wh65'

CVE-2025-21942 is a medium severity vulnerability in the Linux kernel's Btrfs filesystem zoned mode. It involves a missing unlock operation on an extent range in the cow_file_range() function, which can cause kernel worker threads to hang indefinitely. The issue arises when btrfs_reserve_extent() returns -EAGAIN due to no active zone availability, leading to a failure to unlock allocated extents properly in certain code paths. This hang can impact system availability but does not affect confidentiality or integrity.