Red Hat Security Advisory: kernel security and bug fix update

Important

A flaw was found in the way the Linux kernel's file system implementation handled rename operations in which the source was inside and the destination was outside of a bind mount. A privileged user inside a container could use this flaw to escape the bind mount and, potentially, escalate their privileges on the system.

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

It was found that the x86 ISA (Instruction Set Architecture) is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way (sequential) delivering of benign exceptions such as #AC (alignment check exception) is handled. A privileged user inside a guest could use this flaw to create denial of service conditions on the host kernel.

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')