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CVE-2019-15030

Published: 9 September 2019

In the Linux kernel through 5.2.14 on the powerpc platform, a local user can read vector registers of other users' processes via a Facility Unavailable exception. To exploit the venerability, a local user starts a transaction (via the hardware transactional memory instruction tbegin) and then accesses vector registers. At some point, the vector registers will be corrupted with the values from a different local Linux process because of a missing arch/powerpc/kernel/process.c check.

From the Ubuntu Security Team

It was discovered that the Linux kernel on PowerPC architectures did not properly handle Facility Unavailable exceptions in some situations. A local attacker could use this to expose sensitive information.

Notes

AuthorNote
sbeattie
powerpc arches only

Priority

Medium

Cvss 3 Severity Score

4.4

Score breakdown

Status

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

bionic
Released (4.15.0-1046.46)
disco
Released (5.0.0-1017.18)
eoan Not vulnerable
(5.3.0-1003.3)
upstream
Released (5.3~rc8)
xenial Not vulnerable
(4.4.0-1004.9)
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-64.73)
disco
Released (5.0.0-29.31)
eoan Not vulnerable
(5.3.0-10.11)
trusty Not vulnerable
(3.11.0-12.19)
upstream
Released (5.3~rc8)
xenial Not vulnerable
(4.2.0-16.19)
Patches:
Introduced by

f48e91e87e67b56bef63393d1a02c6e22c1d7078

Fixed by 8205d5d98ef7f155de211f5e2eb6ca03d95a5a60
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1021.24~18.04.1)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1007.8~18.04.1)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

linux-oem-5.4
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1007.12~18.04.1)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1017.19~18.04.1)
eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Not vulnerable
(4.4.0-1012.12)
bionic
Released (4.15.0-1064.71)
disco
Released (5.0.0-1021.22)
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1050.52)
disco
Released (5.0.0-1016.18)
eoan Not vulnerable
(5.3.0-1003.3)
trusty Not vulnerable
(4.4.0-1002.2)
upstream
Released (5.3~rc8)
xenial Not vulnerable
(4.4.0-1001.10)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial
Released (4.15.0-1050.52~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1020.21~18.04.1)
disco
Released (5.0.0-1020.21)
eoan Not vulnerable
(5.3.0-1002.2)
trusty
Released (4.15.0-1059.64~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.3~rc8)
xenial
Released (4.15.0-1059.64)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1020.21~18.04.1)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial
Released (4.15.0-1059.64)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1044.70)
disco
Released (5.0.0-1017.17)
eoan Not vulnerable
(5.3.0-1003.3)
trusty Does not exist

upstream
Released (5.3~rc8)
xenial
Released (4.15.0-1044.46)
linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1008.9~18.04.1)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1044.70)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1044.46)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1017.17~18.04.1)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-29.31~18.04.1)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial
Released (4.15.0-64.73~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was pending)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial
Released (4.15.0-64.73~16.04.1)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

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

disco Does not exist

eoan Does not exist

trusty Not vulnerable
(4.4.0-13.29~14.04.1)
upstream
Released (5.3~rc8)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1056.65)
disco Ignored
(end of life, was pending)
eoan
Released (4.15.0-1059.68)
trusty Does not exist

upstream
Released (5.3~rc8)
xenial Ignored
(end of standard support, was needs-triage)
linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1022.24)
disco Ignored
(end of life, was pending)
eoan
Released (5.0.0-1022.24)
trusty Does not exist

upstream
Released (5.3~rc8)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1025.28)
disco
Released (5.0.0-1004.8)
eoan Not vulnerable
(5.3.0-1002.2)
trusty Does not exist

upstream
Released (5.3~rc8)
xenial
Released (4.15.0-1025.28~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1047.51)
disco
Released (5.0.0-1017.17)
eoan Not vulnerable
(5.0.0-1017.17)
trusty Does not exist

upstream
Released (5.3~rc8)
xenial Not vulnerable
(4.2.0-1013.19)

Severity score breakdown

Parameter Value
Base score 4.4
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact Low
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L