CVE-2019-7221
Published: 21 March 2019
The KVM implementation in the Linux kernel through 4.20.5 has a Use-after-Free.
From the Ubuntu Security Team
Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the KVM subsystem of the Linux kernel, when using nested virtual machines. A local attacker in a guest VM could use this to cause a denial of service (system crash) or possibly execute arbitrary code in the host system.
Notes
Author | Note |
---|---|
tyhicks | Ubuntu kernels do not enable nested KVM virtualization by default and are unaffected by this flaw in the default configuration. However, installing QEMU results in nested KVM support to be enabled via the /etc/modprobe.d/qemu-system-x86.conf file. To ensure that nested virtualization is not enabled, verify that the /sys/module/kvm_intel/parameters/nested file contains "N". |
Priority
Status
Package | Release | Status |
---|---|---|
linux Launchpad, Ubuntu, Debian |
upstream |
Released
(5.0~rc6)
|
trusty |
Not vulnerable
(3.11.0-12.19)
|
|
xenial |
Released
(4.4.0-145.171)
|
|
bionic |
Released
(4.15.0-47.50)
|
|
cosmic |
Released
(4.18.0-17.18)
|
|
disco |
Not vulnerable
(5.0.0-7.8)
|
|
Patches: Introduced by f4124500c2c13eb1208c6143b3f6d469709dea10 |
||
linux-goldfish Launchpad, Ubuntu, Debian |
trusty |
Does not exist
(trusty was ignored [abandoned])
|
bionic |
Does not exist
|
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Ignored
(end of life)
|
|
linux-flo Launchpad, Ubuntu, Debian |
upstream |
Released
(5.0~rc6)
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
xenial |
Ignored
(abandoned)
|
|
bionic |
Does not exist
|
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
linux-aws Launchpad, Ubuntu, Debian |
upstream |
Released
(5.0~rc6)
|
trusty |
Released
(4.4.0-1040.43)
|
|
xenial |
Released
(4.4.0-1079.89)
|
|
bionic |
Released
(4.15.0-1035.37)
|
|
cosmic |
Released
(4.18.0-1012.14)
|
|
disco |
Not vulnerable
(5.0.0-1001.1)
|
|
linux-azure Launchpad, Ubuntu, Debian |
upstream |
Released
(5.0~rc6)
|
trusty |
Released
(4.15.0-1041.45~14.04.1)
|
|
bionic |
Released
(4.18.0-1014.14~18.04.1)
|
|
cosmic |
Released
(4.18.0-1014.14)
|
|
disco |
Not vulnerable
(5.0.0-1001.1)
|
|
xenial |
Released
(4.15.0-1041.45)
|
|
linux-aws-hwe Launchpad, Ubuntu, Debian |
upstream |
Released
(5.0~rc6)
|
trusty |
Does not exist
|
|
xenial |
Released
(4.15.0-1035.37~16.04.1)
|
|
bionic |
Does not exist
|
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
linux-azure-edge Launchpad, Ubuntu, Debian |
bionic |
Released
(4.18.0-1014.14~18.04.1)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Released
(4.15.0-1041.45)
|
|
linux-euclid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Ignored
(was needed ESM criteria)
|
|
linux-gcp Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1029.31)
|
cosmic |
Released
(4.18.0-1008.9)
|
|
disco |
Not vulnerable
(5.0.0-1001.1)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Released
(4.15.0-1029.31~16.04.1)
|
|
linux-gcp-edge Launchpad, Ubuntu, Debian |
bionic |
Released
(4.18.0-1008.9~18.04.1)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Does not exist
|
|
linux-gke Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Ignored
(end of standard support)
|
|
linux-grouper Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Does not exist
|
|
linux-hwe Launchpad, Ubuntu, Debian |
bionic |
Released
(4.18.0-17.18~18.04.1)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Released
(4.15.0-47.50~16.04.1)
|
|
linux-hwe-edge Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.0.0-15.16~18.04.1)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Released
(4.15.0-47.50~16.04.1)
|
|
linux-kvm Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1031.31)
|
cosmic |
Released
(4.18.0-1009.9)
|
|
disco |
Not vulnerable
(5.0.0-1001.1)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Released
(4.4.0-1043.49)
|
|
linux-lts-trusty Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Does not exist
|
|
linux-lts-utopic Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Ignored
(end of life, was ignored)
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Does not exist
|
|
linux-lts-vivid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Ignored
(end of life, was ignored)
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Does not exist
|
|
linux-lts-wily Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Ignored
(end of life, was ignored)
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Does not exist
|
|
linux-lts-xenial Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Released
(4.4.0-144.170~14.04.1)
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Does not exist
|
|
linux-maguro Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Does not exist
|
|
linux-mako Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Ignored
(abandoned)
|
|
linux-manta Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Does not exist
|
|
linux-oem Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1035.40)
|
cosmic |
Released
(4.15.0-1035.40)
|
|
disco |
Not vulnerable
(4.15.0-1035.40)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Ignored
(end of standard support, was needs-triage)
|
|
linux-oracle Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1010.12)
|
cosmic |
Released
(4.15.0-1010.12)
|
|
disco |
Not vulnerable
(4.15.0-1010.12)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Released
(4.15.0-1010.12~16.04.1)
|
|
linux-raspi2 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1033.35)
|
cosmic |
Released
(4.18.0-1011.13)
|
|
disco |
Not vulnerable
(5.0.0-1004.4)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.0~rc6)
|
|
xenial |
Released
(4.4.0-1106.114)
|
|
linux-snapdragon Launchpad, Ubuntu, Debian |
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
(5.0~rc6)
|
|
xenial |
Released
(4.4.0-1110.115)
|
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:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-7221
- https://ubuntu.com/security/notices/USN-3930-1
- https://ubuntu.com/security/notices/USN-3930-2
- https://ubuntu.com/security/notices/USN-3931-1
- https://ubuntu.com/security/notices/USN-3931-2
- https://ubuntu.com/security/notices/USN-3932-1
- https://ubuntu.com/security/notices/USN-3932-2
- NVD
- Launchpad
- Debian