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
Status
| Package | Release | Status |
|---|---|---|
|
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
|
||
|
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-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-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-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 |
References
- https://git.kernel.org/linus/e7af6307a8a54f0b873960b32b6a644f2d0fbd97
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.11
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e7af6307a8a54f0b873960b32b6a644f2d0fbd97
- https://github.com/torvalds/linux/commit/e7af6307a8a54f0b873960b32b6a644f2d0fbd97
- https://ubuntu.com/security/notices/USN-4225-1
- https://ubuntu.com/security/notices/USN-4227-1
- https://ubuntu.com/security/notices/USN-4227-2
- https://www.cve.org/CVERecord?id=CVE-2019-19807
- NVD
- Launchpad
- Debian