(RHSA-2016:0004) Important: kernel security update

2016-01-07T05:00:00
ID RHSA-2016:0004
Type redhat
Reporter RedHat
Modified 2016-04-04T19:56:50

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

  • 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) and #DB (debug exception) is handled. A privileged user inside a guest could use these flaws to create denial of service conditions on the host kernel. (CVE-2015-5307, CVE-2015-8104, Important)

Red Hat would like to thank Ben Serebrin of Google Inc. for reporting the CVE-2015-5307 issue.

All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.