ext4_protect_reserved_inode in fs/ext4/block_validity.c in the Linux kernel through 5.5.3 allows attackers to cause a denial of service (soft lockup) via a crafted journal size References: https://patchwork.ozlabs.org/patch/1236118/ https://osint.geekcq.com/2020/02/14/cve-2020-8992/