CVE-2021-28700
First published: Fri Aug 27 2021(Updated: )
xen/arm: No memory limit for dom0less domUs The dom0less feature allows an administrator to create multiple unprivileged domains directly from Xen. Unfortunately, the memory limit from them is not set. This allow a domain to allocate memory beyond what an administrator originally configured.
Credit: security@xen.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 | >=4.12.0 | |
| Fedora | =33 | |
| Fedora | =34 | |
| Fedora | =35 | |
| Debian | =11.0 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/
- https://security.gentoo.org/glsa/202208-23
- https://www.debian.org/security/2021/dsa-4977
- https://xenbits.xenproject.org/xsa/advisory-383.txt
- https://xenbits.xen.org/xsa/advisory-383.html
- https://security-tracker.debian.org/tracker/CVE-2021-28700
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/
Frequently Asked Questions
What is the severity of CVE-2021-28700?
CVE-2021-28700 is considered a medium severity vulnerability due to the potential for unprivileged domains to allocate excessive memory.
How do I fix CVE-2021-28700?
To fix CVE-2021-28700, ensure you update to the latest versions of Xen, such as 4.11.4+107-gef32c7afa2-1 or higher.
What versions of Xen are affected by CVE-2021-28700?
CVE-2021-28700 affects Xen versions starting from 4.12.0 and includes specific versions up to 4.17.2+55-g0b56bed864-1.
What is the risk of having CVE-2021-28700 unpatched in my system?
Leaving CVE-2021-28700 unpatched can allow unprivileged domains to consume unlimited memory, potentially leading to Denial of Service attacks.
Is CVE-2021-28700 specific to any operating systems?
CVE-2021-28700 primarily affects Xen running on Debian and Fedora operating systems.
- collector/security-tracker-debian
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/weakness
- agent/author
- agent/references
- agent/last-modified-date
- agent/description
- agent/first-publish-date
- agent/event
- agent/source
- agent/tags
- agent/softwarecombine
- collector/nvd-index
- agent/software-canonical-lookup-request
- package-manager/debian
- vendor/xen
- canonical/xen xen-unstable
- version/xen xen-unstable/4.12.0
- vendor/fedoraproject
- canonical/fedora
- version/fedora/33
- version/fedora/34
- version/fedora/35
- vendor/debian
- canonical/debian
- version/debian/11.0