CVE-2020-27672: Use After Free
First published: Thu Oct 22 2020(Updated: )
An issue was discovered in Xen through 4.14.x allowing x86 guest OS users to cause a host OS denial of service, achieve data corruption, or possibly gain privileges by exploiting a race condition that leads to a use-after-free involving 2MiB and 1GiB superpages.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/xen | 4.11.4+107-gef32c7afa2-1 4.14.6-1 4.14.5+94-ge49571868d-1 4.17.1+2-gb773c48e36-1 4.17.2+55-g0b56bed864-1 | |
| Xen xen-unstable | >=3.2.0<=4.14.0 | |
| Fedora | =31 | |
| openSUSE | =15.1 | |
| openSUSE | =15.2 | |
| Debian | =10.0 |
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Reference Links
- https://xenbits.xen.org/xsa/advisory-345.html
- https://security-tracker.debian.org/tracker/CVE-2020-27672
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00075.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00025.html
- http://www.openwall.com/lists/oss-security/2021/01/19/7
- http://xenbits.xen.org/xsa/advisory-345.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XIK57QJOVOPWH6RFRNMGOBCROBCKMDG2/
- https://security.gentoo.org/glsa/202011-06
- https://www.debian.org/security/2020/dsa-4804
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XIK57QJOVOPWH6RFRNMGOBCROBCKMDG2/
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2020-27672.
What is the severity of CVE-2020-27672?
The severity of CVE-2020-27672 is high.
What software is affected by CVE-2020-27672?
The affected software includes Xen, Debian Linux, Fedoraproject Fedora, and openSUSE Leap.
How can x86 guest OS users exploit CVE-2020-27672?
x86 guest OS users can exploit CVE-2020-27672 by exploiting a race condition that leads to a use-after-free involving 2MiB and 1GiB superpages.
Are there any remedies available for CVE-2020-27672?
Yes, there are remedies available for CVE-2020-27672. Please refer to the advisory links provided for more information.
- collector/security-tracker-debian
- agent/weakness
- agent/type
- agent/remedy
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/author
- agent/severity
- agent/last-modified-date
- agent/description
- agent/first-publish-date
- agent/event
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- package-manager/debian
- vendor/xen
- canonical/xen xen-unstable
- version/xen xen-unstable/3.2.0
- version/xen xen-unstable/4.14.0
- vendor/fedoraproject
- canonical/fedora
- version/fedora/31
- vendor/opensuse
- canonical/opensuse
- version/opensuse/15.1
- version/opensuse/15.2
- vendor/debian
- canonical/debian
- version/debian/10.0