kernel security update

2016-03-16T14:17:08
ID CESA-2016:0450
Type centos
Reporter CentOS Project
Modified 2016-03-16T14:17:08

Description

CentOS Errata and Security Advisory CESA-2016:0450

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

  • An integer overflow flaw was found in the way the Linux kernel's Frame Buffer device implementation mapped kernel memory to user space via the mmap syscall. A local user able to access a frame buffer device file (/dev/fb*) could possibly use this flaw to escalate their privileges on the system. (CVE-2013-2596, Important)

  • It was found that the Xen hypervisor x86 CPU emulator implementation did not correctly handle certain instructions with segment overrides, potentially resulting in a memory corruption. A malicious guest user could use this flaw to read arbitrary data relating to other guests, cause a denial of service on the host, or potentially escalate their privileges on the host. (CVE-2015-2151, Important)

This update also fixes the following bugs:

  • Previously, the CPU power of a CPU group could be zero. As a consequence, a kernel panic occurred at "find_busiest_group+570" with do_divide_error. The provided patch ensures that the division is only performed if the CPU power is not zero, and the aforementioned panic no longer occurs. (BZ#1209728)

  • Prior to this update, a bug occurred when performing an online resize of an ext4 file system which had been previously converted from ext3. As a consequence, the kernel crashed. The provided patch fixes online resizing for such file systems by limiting the blockgroup search loop for non-extent files, and the mentioned kernel crash no longer occurs. (BZ#1301100)

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.

Merged security bulletin from advisories: http://lists.centos.org/pipermail/centos-announce/2016-March/021734.html

Affected packages: kernel kernel-PAE kernel-PAE-devel kernel-debug kernel-debug-devel kernel-devel kernel-doc kernel-headers kernel-xen kernel-xen-devel

Upstream details at: https://rhn.redhat.com/errata/RHSA-2016-0450.html