In the Linux kernel 5.0.21, mounting a crafted btrfs filesystem image, performing some operations, and unmounting can lead to a use-after-free in btrfs_queue_work in fs/btrfs/async-thread.c.Referenceshttps://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19377https://security.netapp.com/advisory/ntap-20200103-0001/https://usn.ubuntu.com/4367-1/https://usn.ubuntu.com/4369-1/https://usn.ubuntu.com/4414-1/https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
