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CVE-2018-16884

Published: 18 December 2018

A flaw was found in the Linux kernel's NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.

From the Ubuntu security team

Vasily Averin and Evgenii Shatokhin discovered that a use-after-free vulnerability existed in the NFS41+ subsystem when multiple network namespaces are in use. A local attacker in a container could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Medium

CVSS 3 base score: 8.0

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-50.54)
cosmic
Released (4.18.0-20.21)
disco Not vulnerable
(4.19.0-12.13)
precise Ignored
(was needs-triage ESM criteria)
trusty Ignored
(was needed ESM criteria)
upstream
Released (5.0~rc1)
xenial
Released (4.4.0-145.171)
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1039.41)
cosmic
Released (4.18.0-1016.18)
disco Not vulnerable
(5.0.0-1001.1)
precise Does not exist

trusty
Released (4.4.0-1040.43)
upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1079.89)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1039.41~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1018.18~18.04.1)
cosmic
Released (4.18.0-1018.18)
disco Not vulnerable
(5.0.0-1001.1)
precise Does not exist

trusty
Released (4.15.0-1045.49~14.04.1)
upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1045.49)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1018.18~18.04.1)
cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1045.49)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Ignored
(was needs-triage ESM criteria)
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Ignored
(abandoned)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1032.34)
cosmic
Released (4.18.0-1011.12)
disco Not vulnerable
(5.0.0-1001.1)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1032.34~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1011.12~18.04.1)
cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Ignored
(end-of-life)
linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1032.34)
disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1011.11~18.04.1)
disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Ignored
(end-of-life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-20.21~18.04.1)
cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-50.54~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-15.16~18.04.1)
cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-50.54~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1034.34)
cosmic
Released (4.18.0-1012.12)
disco Not vulnerable
(5.0.0-1001.1)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1043.49)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

precise Ignored
(was needs-triage ESM criteria)
trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [end-of-life])
upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [end-of-life])
upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [end-of-life])
upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty
Released (4.4.0-144.170~14.04.1)
upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1038.43)
cosmic
Released (4.15.0-1038.43)
disco
Released (4.15.0-1038.43)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Ignored
(was needs-triage now end-of-life)
linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1013.15)
cosmic
Released (4.15.0-1013.15)
disco
Released (4.15.0-1013.15)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1013.15~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1036.38)
cosmic
Released (4.18.0-1014.16)
disco Not vulnerable
(5.0.0-1004.4)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1106.114)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1053.57)
cosmic Does not exist

disco Not vulnerable
(5.0.0-1010.10)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1110.115)