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CVE-2016-4581

Published: 23 May 2016

fs/pnode.c in the Linux kernel before 4.5.4 does not properly traverse a mount propagation tree in a certain case involving a slave mount, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) via a crafted series of mount system calls.

From the Ubuntu Security Team

It was discovered that in some situations the Linux kernel did not handle propagated mounts correctly. A local unprivileged attacker could use this to cause a denial of service (system crash).

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

5.5

Score breakdown

Status

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

trusty
Released (3.13.0-87.133)
wily
Released (4.2.0-38.45)
xenial
Released (4.4.0-24.43)
yakkety Not vulnerable
(4.4.0-23.41)
upstream
Released (4.6~rc7)
Patches:
Introduced by

f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68

Fixed by 5ec0811d30378ae104f250bfc9b3640242d81e3f
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 (4.6~rc7)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
trusty Not vulnerable
(4.4.0-1002.2)
xenial Not vulnerable
(4.4.0-1001.10)
yakkety Does not exist

upstream
Released (4.6~rc7)
precise Does not exist

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 (4.6~rc7)
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 (4.6~rc7)
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 (4.6~rc7)
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 (4.6~rc7)
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 (4.6~rc7)
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 (4.6~rc7)
linux-linaro-omap
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 (4.6~rc7)
linux-linaro-shared
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 (4.6~rc7)
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 (4.6~rc7)
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 (4.6~rc7)
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 (4.6~rc7)
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 (4.6~rc7)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
precise
Released (3.13.0-88.135~precise1)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.6~rc7)
linux-lts-utopic
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (3.16.0-73.95~14.04.1)
wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.6~rc7)
linux-lts-vivid
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (3.19.0-61.69~14.04.1)
wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.6~rc7)
linux-lts-wily
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (4.2.0-38.45~14.04.1)
wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.6~rc7)
linux-lts-xenial
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (4.4.0-24.43~14.04.1)
wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.6~rc7)
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 (4.6~rc7)
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 (4.6~rc7)
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 (4.6~rc7)
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 (4.6~rc7)
linux-raspi2
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

wily
Released (4.2.0-1031.41)
xenial
Released (4.4.0-1012.16)
yakkety Not vulnerable
(4.4.0-1011.14)
upstream
Released (4.6~rc7)
linux-snapdragon
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

wily Does not exist

xenial
Released (4.4.0-1015.18)
yakkety Not vulnerable
(4.4.0-1014.16)
upstream
Released (4.6~rc7)
linux-ti-omap4
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.6~rc7)

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H