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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 Severity Score

5.5

Score breakdown

Status

Package Release Status
linux-gcp
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic
Released (4.15.0-1027.28)
cosmic
Released (4.18.0-1004.5)
upstream
Released (4.19~rc7)
xenial
Released (4.15.0-1027.28~16.04.1)
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-44.47)
cosmic
Released (4.18.0-12.13)
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-goldfish
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic 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

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

linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1032.34)
cosmic
Released (4.18.0-1006.7)
trusty
Released (4.4.0-1034.37)
upstream
Released (4.19~rc7)
xenial
Released (4.4.0-1072.82)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1037.39)
cosmic
Released (4.18.0-1006.6)
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
upstream
Released (4.19~rc7)
bionic
Released (4.15.0-1037.39)
cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-1037.39~16.04.1)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.15.0-1032.34~16.04.1)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic 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

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc7)
xenial Ignored
(abandoned)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-1004.5~18.04.1)
cosmic 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

trusty Does not exist

upstream
Released (4.19~rc7)
xenial Ignored
(end of standard support)
linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-13.14~18.04.1)
cosmic 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

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)
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

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

trusty Does not exist
(trusty was ignored [end 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

trusty Does not exist
(trusty was ignored [end 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

trusty Does not exist
(trusty was ignored [end 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

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

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

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

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)
trusty Does not exist

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

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)
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

trusty Does not exist

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

Severity score breakdown

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