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CVE-2015-5307

Published: 10 November 2015

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.

From the Ubuntu Security Team

Ben Serebrin discovered that the KVM hypervisor implementation in the Linux kernel did not properly catch Alignment Check exceptions. An attacker in a guest virtual machine could use this to cause a denial of service (system crash) in the host OS.

Notes

AuthorNote
jdstrand
android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support
sbeattie
affects x86 kernels only
fixed in upstream 54a20552e1eae07aa240fa370a0293e006b5faed ;
however, it hadn't made it to linus' tree before we published kernels
for it, so manually recording everything.
Priority

High

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
Patches:
Introduced by

6aa8b732ca01c3d7a54e93f4d701b8aabbe60fb7

Fixed by 54a20552e1eae07aa240fa370a0293e006b5faed
linux-armadaxp
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-ec2
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-flo
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-fsl-imx51
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-gke
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-goldfish
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-grouper
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-hwe
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-linaro-omap
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-linaro-shared
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-lts-quantal
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-lts-saucy
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-lts-utopic
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-lts-vivid
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-lts-wily
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-lts-xenial
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-maguro
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-mako
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-manta
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-mvl-dove
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-qcm-msm
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-raspi2
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-snapdragon
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
linux-ti-omap4
Launchpad, Ubuntu, Debian
upstream
Released (4.4~rc1)
virtualbox
Launchpad, Ubuntu, Debian
upstream
Released (5.0.14-dfsg-1)
xen
Launchpad, Ubuntu, Debian
upstream Needs triage

Binaries built from this source package are in Universe and so are supported by the community.