Chip Salzenberg Deliver does not properly associate a lockfile with the user who created the file, which allows local users to cause a denial of service (blockage of incoming e-mail) by creating lockfiles for arbitrary mailboxes.
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.