RHSA-2016:0004: Important: kernel security update

First published: Thu Jan 07 2016(Updated: )

The kernel packages contain the Linux kernel, the core of any Linux<br>operating system.<br><li> It was found that the x86 ISA (Instruction Set Architecture) is prone to</li> a denial of service attack inside a virtualized environment in the form of<br>an infinite loop in the microcode due to the way (sequential) delivering of<br>benign exceptions such as #AC (alignment check exception) and #DB (debug<br>exception) is handled. A privileged user inside a guest could use these<br>flaws to create denial of service conditions on the host kernel.<br>(CVE-2015-5307, CVE-2015-8104, Important)<br>Red Hat would like to thank Ben Serebrin of Google Inc. for reporting the<br>CVE-2015-5307 issue.<br>All kernel users are advised to upgrade to these updated packages, which<br>contain backported patches to correct these issues. The system must be<br>rebooted for this update to take effect.<br>

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