A use-after-free vulnerability was found in the Linux kernel in
drivers/net/hamradio. This flaw allows a local attacker with a user
privilege to cause a denial of service (DOS) when the mkiss or sixpack
device is detached and reclaim resources early.

It was discovered that the implementation of the 6pack and mkiss protocols
in the Linux kernel did not handle detach events properly in some
situations, leading to a use-after-free vulnerability. A local attacker
could possibly use this to cause a denial of service (system crash).