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.

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)

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

References

Bugs