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CVE-2016-9793

Published: 28 December 2016

The sock_setsockopt function in net/core/sock.c in the Linux kernel before 4.8.14 mishandles negative values of sk_sndbuf and sk_rcvbuf, which allows local users to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact by leveraging the CAP_NET_ADMIN capability for a crafted setsockopt system call with the (1) SO_SNDBUFFORCE or (2) SO_RCVBUFFORCE option.

From the Ubuntu Security Team

Andrey Konovalov discovered that signed integer overflows existed in the setsockopt() system call when handling the SO_SNDBUFFORCE and SO_RCVBUFFORCE options. A local attacker with the CAP_NET_ADMIN capability could use this to cause a denial of service (system crash or memory corruption).

Notes

AuthorNote
sbeattie
the overflows exist for SO_{SND|RCV}BUFFORCE, so it's
possible for a process with CAP_NET_ADMIN to do this. However,
the check for CAP_NET_ADMIN is via capable() *not* ns_capable(),
so the process attempting this has to have CAP_NET_ADMIN in the
init_ns; having it in a new user namespace (i.e. via unshare()) is
not sufficient. Thus, this cannot be exploited by an unprivileged
user dropping into an unprivileged user namespace. Hence the
low priority.

Priority

Low

Cvss 3 Severity Score

7.8

Score breakdown

Status

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

trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
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
Released (4.4.0-1003.12)
yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
linux-flo
Launchpad, Ubuntu, Debian
precise Does not exist

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

yakkety Not vulnerable

zesty Does not exist

upstream
Released (4.9~rc8)
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

zesty Does not exist

upstream
Released (4.9~rc8)
linux-goldfish
Launchpad, Ubuntu, Debian
precise Does not exist

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

yakkety Not vulnerable

zesty Not vulnerable

upstream
Released (4.9~rc8)
linux-grouper
Launchpad, Ubuntu, Debian
precise Does not exist

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

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
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

zesty Does not exist

upstream
Released (4.9~rc8)
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

zesty Does not exist

upstream
Released (4.9~rc8)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
precise Ignored
(end of life)
trusty Does not exist

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

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
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

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
linux-lts-saucy
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
precise
Released (3.13.0-107.154~precise1)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
linux-lts-utopic
Launchpad, Ubuntu, Debian
precise Does not exist

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

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
linux-lts-vivid
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (3.19.0-79.87~14.04.1)
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
linux-lts-wily
Launchpad, Ubuntu, Debian
precise Does not exist

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

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
linux-lts-xenial
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (4.4.0-59.80~14.04.1)
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
linux-maguro
Launchpad, Ubuntu, Debian
precise Does not exist

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

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
linux-mako
Launchpad, Ubuntu, Debian
precise Does not exist

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

yakkety Not vulnerable

zesty Does not exist

upstream
Released (4.9~rc8)
linux-manta
Launchpad, Ubuntu, Debian
precise Does not exist

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

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
linux-qcm-msm
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.9~rc8)
linux-raspi2
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial
Released (4.4.0-1040.47)
yakkety
Released (4.8.0-1022.25)
zesty Not vulnerable
(4.8.0-1024.27)
upstream
Released (4.9~rc8)
linux-snapdragon
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial
Released (4.4.0-1044.48)
yakkety
Released (4.4.0-1046.50)
zesty Not vulnerable
(4.4.0-1046.50)
upstream
Released (4.9~rc8)
linux
Launchpad, Ubuntu, Debian
upstream
Released (4.9~rc8)
precise Not vulnerable

trusty
Released (3.13.0-107.154)
xenial
Released (4.4.0-59.80)
yakkety
Released (4.8.0-34.36)
zesty Not vulnerable
(4.9.0-11.12)
Patches:
Introduced by

82981930125abfd39d7c8378a9cfdf5e1be2002b

Fixed by b98b0bc8c431e3ceb4b26b0dfc8db509518fb290
linux-linaro-omap
Launchpad, Ubuntu, Debian
upstream
Released (4.9~rc8)
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-linaro-shared
Launchpad, Ubuntu, Debian
upstream
Released (4.9~rc8)
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-ti-omap4
Launchpad, Ubuntu, Debian
upstream
Released (4.9~rc8)
precise Not vulnerable

trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty 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