Title
MGASA-2020-0355 -- security update for kernel, kernel-linus, kmod-virtualbox, kmod-xtables-addons, wireguard-tools
Description
In the Linux kernel 5.0.21 and 5.3.11, mounting a crafted btrfs filesystem
image, performing some operations, and then making a syncfs system call can
lead to a use-after-free in try_merge_free_space in
fs/btrfs/free-space-cache.c because the pointer to a left data structure can
be the same as the pointer to a right data structure (CVE-2019-19448).
A memory out-of-bounds read flaw was found in the Linux kernel's ext3/ext4
filesystem, in the way it accesses a directory with broken indexing. This flaw
allows a local user to crash the system if the directory exists. The highest
threat from this vulnerability is to system availability (CVE-2020-14314).