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CVE-2016-3157

Published: 12 April 2016

The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel does not properly context-switch IOPL on 64-bit PV Xen guests, which allows local guest OS users to gain privileges, cause a denial of service (guest OS crash), or obtain sensitive information by leveraging I/O port access.

From the Ubuntu security team

Andy Lutomirski discovered that the Linux kernel did not properly context- switch IOPL on 64-bit PV Xen guests. An attacker in a guest OS could use this to cause a denial of service (guest OS crash), gain privileges, or obtain sensitive information.

Priority

Medium

CVSS 3 base score: 7.8

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
Patches:
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed by b7a584598aea7ca73140cb87b40319944dd3393f
linux-armadaxp
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-linaro-omap
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-linaro-shared
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-quantal
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-saucy
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-qcm-msm
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-ti-omap4
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)