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CVE-2019-19807

Published: 15 December 2019

In the Linux kernel before 5.3.11, sound/core/timer.c has a use-after-free caused by erroneous code refactoring, aka CID-e7af6307a8a5. This is related to snd_timer_open and snd_timer_close_locked. The timeri variable was originally intended to be for a newly created timer instance, but was used for a different purpose after refactoring.

From the Ubuntu Security Team

Tristan Madani discovered that the ALSA timer implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1057.59)
disco Not vulnerable
(4.18.0-1002.3)
eoan
Released (5.3.0-1009.10)
trusty Not vulnerable
(4.4.0-1002.2)
upstream
Released (5.4~rc7)
xenial Not vulnerable
(4.4.0-1001.10)
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 (5.4~rc7)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1010.11~18.04.1)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial Does not exist

linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-74.84)
disco Not vulnerable
(4.18.0-10.11)
eoan
Released (5.3.0-26.28)
trusty Not vulnerable
(3.11.0-12.19)
upstream
Released (5.4~rc7)
xenial Not vulnerable
(4.2.0-16.19)
Patches:
Introduced by

41672c0c24a62699d20aab53b98d843b16483053

Fixed by e7af6307a8a54f0b873960b32b6a644f2d0fbd97
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial
Released (4.15.0-1057.59~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
disco Not vulnerable
(4.18.0-1003.3)
eoan
Released (5.3.0-1009.10)
trusty
Released (4.15.0-1066.71~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.4~rc7)
xenial
Released (4.15.0-1066.71)
linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1009.10~18.04.1)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial Ignored
(end of standard support, was needs-triage)
linux-gcp
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1001.1)
disco Not vulnerable
(4.18.0-1002.3)
eoan
Released (5.3.0-1011.12)
trusty Does not exist

upstream
Released (5.4~rc7)
xenial
Released (4.15.0-1052.56)
linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1050.53)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
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

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial Does not exist

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

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial
Released (4.15.0-74.83~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1052.52)
disco Not vulnerable
(4.18.0-1003.3)
eoan
Released (5.3.0-1009.10)
trusty Does not exist

upstream
Released (5.4~rc7)
xenial Not vulnerable
(4.4.0-1004.9)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
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 (5.4~rc7)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1066.76)
disco Ignored
(end of life, was pending)
eoan
Released (4.15.0-1066.76)
trusty Does not exist

upstream
Released (5.4~rc7)
xenial Ignored
(end of standard support, was needs-triage)
linux-oem-5.4
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1010.11)
disco Not vulnerable
(5.0.0-1010.11)
eoan Not vulnerable
(5.0.0-1010.11)
trusty Does not exist

upstream
Released (5.4~rc7)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1031.34)
disco Not vulnerable
(4.15.0-1007.9)
eoan
Released (5.3.0-1008.9)
trusty Does not exist

upstream
Released (5.4~rc7)
xenial
Released (4.15.0-1031.34~16.04.1)
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 (5.4~rc7)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1053.57)
disco Not vulnerable
(4.18.0-1005.7)
eoan
Released (5.3.0-1015.17)
trusty Does not exist

upstream
Released (5.4~rc7)
xenial Not vulnerable
(4.2.0-1013.19)
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 (5.4~rc7)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1070.77)
disco Not vulnerable
(5.0.0-1010.10)
eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc7)
xenial Not vulnerable
(4.4.0-1012.12)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H