Canonical today released several security updates for its Ubuntu 15.10 distributions and Ubuntu 15.10 for Raspberry Pi 2. All of the updates upgrade the operating systems' kernel.
Specifically, they fix a total of five vulnerabilities in the kernel that were discovered by various hackers.
The first security flaw was discovered in the Linux kernel's OverlayFS file system, which allows a local attacker to become root.
The second issue again concerns the Linux kernel's OverlayFS file system, which again allows a local attacker to escalate privileges.
The third security issue concerns the way the kernel enforces rlimits. The flaw allowed local attackers to carry out DoS (Denial-of-Service) attacks.
The fourth vulnerability was discovered in the Linux kernel's FUSE (Filesystem in Userspace). The vulnerability again allowed a local attacker to carry out DoS attacks.
The latest security flaw was discovered in the Linux kernel's TLB (Translation Lookaside Buffer) and could allow sensitive information to be leaked or DoS (denial-of-service) attacks to be launched.
Canonical urges all Ubuntu users to update their computers and devices immediately.
After installing the updates, a restart is required.
