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CVE-2016-4794

Published: 23 May 2016

Use-after-free vulnerability in mm/percpu.c in the Linux kernel through 4.6 allows local users to cause a denial of service (BUG) or possibly have unspecified other impact via crafted use of the mmap and bpf system calls.

From the Ubuntu Security Team

Sasha Levin discovered that a use-after-free existed in the percpu allocator in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code with administrative privileges.

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

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

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

upstream
Released (4.7~rc4)
wily Ignored
(end of life)
xenial
Released (4.4.0-34.53)
yakkety Not vulnerable
(4.4.0-33.52)
precise Not vulnerable

Patches:
Introduced by

9c824b6a172c8d44a6b037946bae90127c969b1b

Fixed by 4f996e234dad488e5d9ba0858bc1bae12eff82c3
Introduced by

1a4d76076cda69b0abf15463a8cebc172406da25

Fixed by 6710e594f71ccaad8101bc64321152af7cd9ea28
linux-armadaxp
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
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)
xenial Not vulnerable
(4.4.0-1001.10)
yakkety Does not exist

upstream
Released (4.7~rc4)
linux-flo
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
wily Not vulnerable

xenial Not vulnerable

yakkety Not vulnerable

upstream
Released (4.7~rc4)
linux-gke
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Not vulnerable
(4.4.0-1003.3)
yakkety Does not exist

upstream
Released (4.7~rc4)
linux-goldfish
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
wily Not vulnerable

xenial Not vulnerable

yakkety Not vulnerable

upstream
Released (4.7~rc4)
linux-grouper
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-hwe
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Not vulnerable
(4.8.0-36.36~16.04.1)
yakkety Does not exist

upstream
Released (4.7~rc4)
linux-hwe-edge
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Not vulnerable
(4.8.0-36.36~16.04.1)
yakkety Does not exist

upstream
Released (4.7~rc4)
linux-linaro-omap
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

upstream
Released (4.7~rc4)
wily Does not exist

xenial Does not exist

yakkety Does not exist

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

upstream
Released (4.7~rc4)
wily Does not exist

xenial Does not exist

yakkety Does not exist

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

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-lts-quantal
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
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

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-lts-saucy
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-lts-utopic
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was not-affected)
wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-lts-vivid
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (3.19.0-66.74~14.04.1)
wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-lts-wily
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-lts-xenial
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (4.4.0-34.53~14.04.1)
wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-maguro
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-mako
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
wily Not vulnerable

xenial Not vulnerable

yakkety Not vulnerable

upstream
Released (4.7~rc4)
linux-manta
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
wily Not vulnerable

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-qcm-msm
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.7~rc4)
linux-raspi2
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

wily Ignored
(end of life)
xenial
Released (4.4.0-1019.25)
yakkety Not vulnerable
(4.8.0-1012.14)
upstream
Released (4.7~rc4)
linux-snapdragon
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

wily Does not exist

xenial
Released (4.4.0-1022.25)
yakkety Not vulnerable
(4.4.0-1022.25)
upstream
Released (4.7~rc4)
linux-ti-omap4
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Does not exist

upstream
Released (4.7~rc4)
wily Does not exist

xenial Does not exist

yakkety Does not exist

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H