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CVE-2018-7995

Published: 9 March 2018

** DISPUTED ** Race condition in the store_int_with_restart() function in arch/x86/kernel/cpu/mcheck/mce.c in the Linux kernel through 4.15.7 allows local users to cause a denial of service (panic) by leveraging root access to write to the check_interval file in a /sys/devices/system/machinecheck/machinecheck<cpu number> directory. NOTE: a third party has indicated that this report is not security relevant.

From the Ubuntu Security Team

It was discovered that a race condition existed in the x86 machine check handler in the Linux kernel. A local privileged attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Notes

AuthorNote
sbeattie
requires root privileges to write to the machinecheck sysfs
files

Priority

Negligible

Cvss 3 Severity Score

4.7

Score breakdown

Status

Package Release Status
linux-flo
Launchpad, Ubuntu, Debian
upstream
Released (4.16~rc5)
bionic Does not exist

artful Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Ignored
(abandoned)
linux-aws
Launchpad, Ubuntu, Debian
upstream
Released (4.16~rc5)
bionic Not vulnerable
(4.15.0-1003.3)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1007.7)
disco Not vulnerable
(4.18.0-1002.3)
trusty
Released (4.4.0-1022.22)
xenial
Released (4.4.0-1060.69)
linux-gke
Launchpad, Ubuntu, Debian
upstream
Released (4.16~rc5)
bionic Not vulnerable

artful Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

xenial Ignored
(end of standard support, was needed)
linux-azure
Launchpad, Ubuntu, Debian
upstream
Released (4.16~rc5)
bionic Not vulnerable
(4.15.0-1003.3)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1009.9)
disco Not vulnerable
(4.18.0-1003.3)
trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
xenial
Released (4.15.0-1013.13~16.04.2)
linux-gcp
Launchpad, Ubuntu, Debian
upstream
Released (4.16~rc5)
bionic Not vulnerable
(4.15.0-1003.3)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1006.6)
disco Not vulnerable
(4.18.0-1002.3)
trusty Does not exist

xenial
Released (4.15.0-1014.14~16.04.1)
linux-euclid
Launchpad, Ubuntu, Debian
upstream
Released (4.16~rc5)
bionic Does not exist

artful Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

xenial Ignored
(was needs-triage ESM criteria)
linux-azure-edge
Launchpad, Ubuntu, Debian
upstream
Released (4.16~rc5)
bionic Not vulnerable
(4.15.0-1003.3)
cosmic Does not exist

disco Does not exist

trusty Does not exist

xenial
Released (4.15.0-1013.13~16.04.2)
linux-gcp-edge
Launchpad, Ubuntu, Debian
upstream
Released (4.16~rc5)
bionic Not vulnerable
(4.18.0-1004.5~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

xenial Does not exist

linux-aws-hwe
Launchpad, Ubuntu, Debian
upstream
Released (4.16~rc5)
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

xenial Not vulnerable
(4.15.0-1030.31~16.04.1)
linux
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic Not vulnerable
(4.15.0-13.14)
cosmic Not vulnerable
(4.15.0-20.21)
disco Not vulnerable
(4.18.0-10.11)
trusty Ignored
(was needed ESM criteria)
upstream
Released (4.16~rc5)
xenial
Released (4.4.0-127.153)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by b3b7c4795ccab5be71f080774c45bbbcc75c2aaf
linux-armadaxp
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-goldfish
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.16~rc5)
xenial Ignored
(end of life, was needed)
linux-grouper
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.16~rc5)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable
(4.18.0-13.14~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial
Released (4.15.0-24.26~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable
(5.0.0-14.15~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial
Released (4.15.0-24.26~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable
(4.15.0-1003.3)
cosmic Not vulnerable
(4.15.0-1008.8)
disco Not vulnerable
(4.18.0-1003.3)
trusty Does not exist

upstream
Released (4.16~rc5)
xenial
Released (4.4.0-1026.31)
linux-linaro-omap
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial Does not exist

linux-linaro-shared
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial Does not exist

linux-linaro-vexpress
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial Does not exist

linux-lts-quantal
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial Does not exist

linux-lts-saucy
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Ignored
(end of life, was ignored)
upstream
Released (4.16~rc5)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Ignored
(end of life, was needs-triage)
upstream
Released (4.16~rc5)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Ignored
(end of life, was ignored)
upstream
Released (4.16~rc5)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty
Released (4.4.0-127.153~14.04.1)
upstream
Released (4.16~rc5)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.16~rc5)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.16~rc5)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.16~rc5)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable
(4.15.0-1002.3)
cosmic Not vulnerable
(4.15.0-1004.5)
disco Not vulnerable
(4.15.0-1021.24)
trusty Does not exist

upstream
Released (4.16~rc5)
xenial Ignored
(end of standard support, was needed)
linux-oracle
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1007.9)
cosmic Not vulnerable
(4.15.0-1007.9)
disco Not vulnerable
(4.15.0-1007.9)
trusty Does not exist

upstream
Released (4.16~rc5)
xenial Not vulnerable
(4.15.0-1007.9~16.04.1)
linux-qcm-msm
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic Not vulnerable
(4.15.0-1006.7)
cosmic Not vulnerable
(4.15.0-1010.11)
disco Not vulnerable
(4.18.0-1005.7)
trusty Does not exist

upstream
Released (4.16~rc5)
xenial
Released (4.4.0-1090.98)
linux-snapdragon
Launchpad, Ubuntu, Debian
artful
Released (4.4.0-1093.98)
bionic
Released (4.15.0-1053.57)
cosmic Does not exist

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

upstream
Released (4.16~rc5)
xenial
Released (4.4.0-1093.98)
linux-ti-omap4
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (4.16~rc5)
xenial Does not exist

Severity score breakdown

Parameter Value
Base score 4.7
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H