high
7.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2019-7221: Use After Free

First published: Sat Feb 02 2019(Updated: )

A use after free issue was found in the way Linux kernel's KVM hypervisor emulates a preemption timer for L2 guest when nested(=1) virtualization is enabled. This high resolution timer(hrtimer) runs when L2 guest is active. After VM exit, in sync_vmcs12() timer object is stopped. The use-after-free occurs if the timer object is free'd before calling sync_vmcs12() routine. A guest user/process could use this flaw to crash the host kernel resulting in DoS OR potentially gain privileged access to a system. It affects only Intel processors and only when nested virtualization is enabled. Upstream patch: --------------- -&gt; <a href="https://git.kernel.org/linus/ecec76885bcfe3294685dc363fd1273df0d5d65f">https://git.kernel.org/linus/ecec76885bcfe3294685dc363fd1273df0d5d65f</a> Reference: ---------- -&gt; <a href="https://www.openwall.com/lists/oss-security/2019/02/18/2">https://www.openwall.com/lists/oss-security/2019/02/18/2</a>

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<=4.20.5
openSUSE Leap=15.0
Fedoraproject Fedora=28
Fedoraproject Fedora=29
Debian Debian Linux=8.0
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=18.10
Netapp Active Iq Performance Analytics Services
Netapp Element Software Management Node
Redhat Openshift Container Platform=3.11
Redhat Enterprise Linux=7.0
Redhat Enterprise Linux Desktop=7.0
Redhat Enterprise Linux Server=7.0
Redhat Enterprise Linux Server Aus=7.6
Redhat Enterprise Linux Server Eus=7.6
Redhat Enterprise Linux Server Tus=7.6
Redhat Enterprise Linux Workstation=7.0
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.112-1
6.11.5-1
6.11.7-1

Remedy

http://www.openwall.com/lists/oss-security/2019/02/18/2

Remedy

https://bugs.chromium.org/p/project-zero/issues/detail?id=1760

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ecec76885bcfe3294685dc363fd1273df0d5d65f

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