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CVE-2015-0239

Published: 23 January 2015

The em_sysenter function in arch/x86/kvm/emulate.c in the Linux kernel before 3.18.5, when the guest OS lacks SYSENTER MSR initialization, allows guest OS users to gain guest OS privileges or cause a denial of service (guest OS crash) by triggering use of a 16-bit code segment for emulation of a SYSENTER instruction.

From the Ubuntu Security Team

A flaw was discovered in the Kernel Virtual Machine's (KVM) emulation of the SYSTENTER instruction when the guest OS does not initialize the SYSENTER MSRs. A guest OS user could exploit this flaw to cause a denial of service of the guest OS (crash) or potentially gain privileges on the guest OS.

Notes

AuthorNote
jdstrand
android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.04 preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support
Priority

High

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
Patches:
Introduced by

6aa8b732ca01c3d7a54e93f4d701b8aabbe60fb7

Fixed by f3747379accba8e95d70cec0eae0582c8c182050
linux-armadaxp
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-ec2
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-flo
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-fsl-imx51
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-gke
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-goldfish
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-grouper
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-hwe
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-hwe-edge
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-linaro-omap
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-linaro-shared
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-lts-quantal
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-lts-saucy
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-lts-utopic
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-lts-vivid
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-lts-wily
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-lts-xenial
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-maguro
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-mako
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-manta
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-mvl-dove
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-qcm-msm
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-raspi2
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-snapdragon
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)
linux-ti-omap4
Launchpad, Ubuntu, Debian
upstream
Released (3.19~rc6)