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CVE-2016-9644

Published: 27 November 2016

The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28 contains extended asm statements that are incompatible with the exception table, which allows local users to obtain root access on non-SMEP platforms via a crafted application. NOTE: this vulnerability exists because of incorrect backporting of the CVE-2016-9178 patch to older kernels.

From the Ubuntu security team

It was discovered that the __get_user_asm_ex implementation in the Linux kernel for x86/x86_64 contained extended asm statements that were incompatible with the exception table. A local attacker could use this to gain administrative privileges.

Priority

Medium

CVSS 3 base score: 7.8

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Pending
(3.13.0-145.194)
upstream
Released (4.8~rc7)
xenial
Released (4.4.0-51.72)
yakkety Not vulnerable
(4.8.0-14.15)
Patches:
Introduced by

1c109fabbd51863475cd12ac206bdd249aee35af

Fixed by 548acf19234dbda5a52d5a8e7e205af46e9da840
linux-armadaxp
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Does not exist

upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Not vulnerable
(4.4.0-1002.2)
upstream
Released (4.8~rc7)
xenial Not vulnerable
(4.4.0-1001.10)
yakkety Does not exist

linux-flo
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (4.8~rc7)
xenial Not vulnerable

yakkety Not vulnerable

linux-gke
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

upstream
Released (4.8~rc7)
xenial Not vulnerable
(4.4.0-1003.3)
yakkety Does not exist

linux-goldfish
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (4.8~rc7)
xenial Not vulnerable

yakkety Not vulnerable

linux-grouper
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

upstream
Released (4.8~rc7)
xenial Not vulnerable
(4.8.0-36.36~16.04.1)
yakkety Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

upstream
Released (4.8~rc7)
xenial Not vulnerable
(4.8.0-36.36~16.04.1)
yakkety Does not exist

linux-linaro-omap
Launchpad, Ubuntu, Debian
precise Ignored
(abandoned)
trusty Does not exist

upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-linaro-shared
Launchpad, Ubuntu, Debian
precise Ignored
(abandoned)
trusty Does not exist

upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-linaro-vexpress
Launchpad, Ubuntu, Debian
precise Ignored
(abandoned)
trusty Does not exist

upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-lts-quantal
Launchpad, Ubuntu, Debian
precise Ignored
(end-of-life)
trusty Does not exist

upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
precise Ignored
(end-of-life)
trusty Does not exist

upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-lts-saucy
Launchpad, Ubuntu, Debian
precise Ignored
(end-of-life)
trusty Does not exist

upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Does not exist

upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-lts-vivid
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was not-affected)
upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-lts-wily
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (4.4.0-51.72~14.04.1)
upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-maguro
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-mako
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (4.8~rc7)
xenial Not vulnerable

yakkety Not vulnerable

linux-manta
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-qcm-msm
Launchpad, Ubuntu, Debian
precise Ignored
(abandoned)
trusty Does not exist

upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

upstream
Released (4.8~rc7)
xenial Not vulnerable
(4.4.0-1038.45)
yakkety Not vulnerable
(4.8.0-1012.14)
linux-snapdragon
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

upstream
Released (4.8~rc7)
xenial
Released (4.4.0-1042.46)
yakkety
Released (4.4.0-1046.50)
linux-ti-omap4
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Does not exist

upstream
Released (4.8~rc7)
xenial Does not exist

yakkety Does not exist

Notes

AuthorNote
sbeattie
1c109fabbd51863475cd12ac206bdd249aee35af
was applied to the 4.4 stable series (in xenial
as 1c109fabbd51863475cd12ac206bdd249aee35af) to fix
CVE-2016-9178, and then got reverted from stable in 4.4.30
(in xenial as 2da13e7f631bb13658e00e61fdea050da25e69e7).
548acf19234dbda5a52d5a8e7e205af46e9da840 was
also very briefly applied to stable in 4.4.29, but
reverted at the same time due to problems (in xenial as
102d19689b2dd4f639a14dfd3f52ce19b5d7bb17). For xenial/4.4
derived kernels, this CVE is fixed with the reversion in
2da13e7f631bb13658e00e61fdea050da25e69e7. However, this leaves
CVE-2016-9178 unfixed.

References