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CVE-2016-2550

Published: 24 February 2016

The Linux kernel before 4.5 allows local users to bypass file-descriptor limits and cause a denial of service (memory consumption) by leveraging incorrect tracking of descriptor ownership and sending each descriptor over a UNIX socket before closing it. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-4312.

From the Ubuntu Security Team

David Herrmann discovered that the Linux kernel incorrectly accounted file descriptors to the original opener for in-flight file descriptors sent over a unix domain socket. A local attacker could use this to cause a denial of service (resource exhaustion).

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
(3.2.0-102.142)
trusty
Released (3.13.0-85.129)
vivid
Released (3.19.0-58.64)
wily
Released (4.2.0-35.40)
xenial Not vulnerable
(4.4.0-11.26)
yakkety Not vulnerable
(4.4.0-21.37)
upstream
Released (4.5~rc4)
Patches:
Introduced by

712f4aad406bb1ed67f3f98d04c044191f0ff593

Fixed by 415e3d3e90ce9e18727e8843ae343eda5a58fad6
linux-armadaxp
Launchpad, Ubuntu, Debian
precise Not vulnerable
(3.2.0-1665.90)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
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 (4.5~rc4)
precise Does not exist

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

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

wily Not vulnerable

xenial Not vulnerable

yakkety Not vulnerable

upstream
Released (4.5~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 (4.5~rc4)
linux-goldfish
Launchpad, Ubuntu, Debian
precise Does not exist

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

wily Not vulnerable

xenial Not vulnerable

yakkety Not vulnerable

upstream
Released (4.5~rc4)
linux-grouper
Launchpad, Ubuntu, Debian
precise Does not exist

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

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~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 (4.5~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 (4.5~rc4)
linux-linaro-omap
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-linaro-shared
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-lts-quantal
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~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

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-lts-saucy
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
precise
Released (3.13.0-85.129~precise1)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-lts-utopic
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (3.16.0-69.89~14.04.1)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-lts-vivid
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (3.19.0-58.64~14.04.1)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-lts-wily
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (4.2.0-35.40~14.04.1)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-lts-xenial
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Not vulnerable
(4.4.0-13.29~14.04.1)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-maguro
Launchpad, Ubuntu, Debian
precise Does not exist

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

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-mako
Launchpad, Ubuntu, Debian
precise Does not exist

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

wily Not vulnerable

xenial Not vulnerable

yakkety Not vulnerable

upstream
Released (4.5~rc4)
linux-manta
Launchpad, Ubuntu, Debian
precise Does not exist

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

wily Not vulnerable

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-qcm-msm
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)
linux-raspi2
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

vivid Does not exist

wily
Released (4.2.0-1028.36)
xenial Not vulnerable
(4.4.0-1004.5)
yakkety Not vulnerable
(4.4.0-1009.10)
upstream
Released (4.5~rc4)
linux-snapdragon
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

wily Does not exist

xenial Not vulnerable
(4.4.0-1012.12)
yakkety Not vulnerable
(4.4.0-1012.12)
upstream
Released (4.5~rc4)
linux-ti-omap4
Launchpad, Ubuntu, Debian
precise Not vulnerable
(3.2.0-1480.106)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.5~rc4)

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