Description

The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #AC (aka Alignment Check) exceptions, related to svm.c and vmx.c.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54a20552e1eae07aa240fa370a0293e006b5faed

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172187.html

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172300.html

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172435.html

http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00035.html

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00005.html

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00026.html

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00031.html

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00013.html

http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html

http://lists.opensuse.org/opensuse-updates/2015-12/msg00039.html

http://lists.opensuse.org/opensuse-updates/2015-12/msg00053.html

http://rhn.redhat.com/errata/RHSA-2015-2636.html

http://rhn.redhat.com/errata/RHSA-2015-2645.html

http://rhn.redhat.com/errata/RHSA-2016-0046.html

http://support.citrix.com/article/CTX202583

http://www.debian.org/security/2015/dsa-3396

http://www.debian.org/security/2015/dsa-3414

http://www.debian.org/security/2016/dsa-3454

http://www.openwall.com/lists/oss-security/2015/11/10/6

http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html

http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html

http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html

http://www.securityfocus.com/bid/77528

http://www.securitytracker.com/id/1034105

http://www.ubuntu.com/usn/USN-2800-1

http://www.ubuntu.com/usn/USN-2801-1

http://www.ubuntu.com/usn/USN-2802-1

http://www.ubuntu.com/usn/USN-2803-1

http://www.ubuntu.com/usn/USN-2804-1

http://www.ubuntu.com/usn/USN-2805-1

http://www.ubuntu.com/usn/USN-2806-1

http://www.ubuntu.com/usn/USN-2807-1

http://xenbits.xen.org/xsa/advisory-156.html

https://bugzilla.redhat.com/show_bug.cgi?id=1277172

https://github.com/torvalds/linux/commit/54a20552e1eae07aa240fa370a0293e006b5faed

https://kb.juniper.net/JSA10783

Details

Risk Information

CVSS v2