CVE-2020-29568
First published: Tue Dec 15 2020(Updated: )
An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are processing watch events using a single thread. If the events are received faster than the thread is able to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xen XAPI | <=4.14.1 | |
| Debian | =9.0 | |
| Debian | =10.0 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.17-1 |
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Reference Links
- https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
- https://security.gentoo.org/glsa/202107-30
- https://www.debian.org/security/2021/dsa-4843
- https://xenbits.xenproject.org/xsa/advisory-349.html
- https://launchpad.net/bugs/cve/CVE-2020-29568
- https://xenbits.xen.org/xsa/advisory-349.html
- https://security-tracker.debian.org/tracker/CVE-2020-29568
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-29568
- https://nvd.nist.gov/vuln/detail/CVE-2020-29568
- https://ubuntu.com/security/CVE-2020-29568
Frequently Asked Questions
What is the severity of CVE-2020-29568?
CVE-2020-29568 is classified as a high-severity vulnerability due to its potential to cause denial of service through out-of-memory (OOM) conditions.
How do I fix CVE-2020-29568?
To mitigate CVE-2020-29568, update to the patched versions of the affected software listed in the vendor's security advisory.
Which applications are affected by CVE-2020-29568?
CVE-2020-29568 affects Xen versions up to and including 4.14.1, as well as specific Debian Linux versions.
What kind of attack can be executed with CVE-2020-29568?
An attacker can exploit CVE-2020-29568 to overwhelm the system's resource handling capabilities, leading to denial of service.
Is there a specific patch for CVE-2020-29568?
Yes, specific versions of the Linux kernel and Xen that fix CVE-2020-29568 are available and should be applied to affected systems.
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