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CVE-2018-17972

Published: 3 October 2018

An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel through 4.18.11. It does not ensure that only root may inspect the kernel stack of an arbitrary task, allowing a local attacker to exploit racy stack unwinding and leak kernel task stack contents.

From the Ubuntu security team

Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information.

Priority

Medium

CVSS 3 base score: 5.5

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-44.47)
cosmic
Released (4.18.0-12.13)
precise Ignored
(was needed ESM criteria)
trusty
Released (3.13.0-165.215)
upstream
Released (4.19~rc7)
xenial
Released (4.4.0-139.165)
Patches:
Introduced by

2ec220e27f5040aec1e88901c1b6ea3d135787ad

Fixed by f8a00cef17206ecd1b30d3d9f99e10d9fa707aa7
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1032.34)
cosmic
Released (4.18.0-1006.7)
precise Does not exist

trusty
Released (4.4.0-1034.37)
upstream
Released (4.19~rc7)
xenial
Released (4.4.0-1072.82)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.15.0-1032.34~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1037.39)
cosmic
Released (4.18.0-1006.6)
precise Does not exist

trusty
Released (4.15.0-1037.39~14.04.2)
upstream
Released (4.19~rc7)
xenial
Released (4.15.0-1037.39~16.04.1)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1037.39)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.15.0-1037.39~16.04.1)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial Ignored
(was needed ESM criteria)
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc7)
xenial Ignored
(abandoned)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1027.28)
cosmic
Released (4.18.0-1004.5)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.15.0-1027.28~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-1004.5~18.04.1)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial Ignored
(end-of-life)
linux-goldfish
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc7)
xenial Ignored
(end-of-life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc7)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-13.14~18.04.1)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.15.0-45.48~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-8.9~18.04.1)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.15.0-45.48~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1029.29)
cosmic
Released (4.18.0-1005.5)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.4.0-1037.43)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise
Released (3.13.0-165.215~precise1)
trusty Does not exist

upstream
Released (4.19~rc7)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.19~rc7)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.19~rc7)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.19~rc7)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty
Released (4.4.0-139.165~14.04.1)
upstream
Released (4.19~rc7)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc7)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc7)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc7)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1033.38)
cosmic
Released (4.15.0-1033.38)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial Ignored
(was needs-triage now end-of-life)
linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1008.10)
cosmic Not vulnerable

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.15.0-1008.10~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1031.33)
cosmic
Released (4.18.0-1007.9)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.4.0-1100.108)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.4.0-1104.109)