Go to homepageCyberStrike

Menu

Star on GitHub · 3.3k
Sign inDownload

CVE-2020-29569

8.8 · HIGH

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x.

Published Dec 15, 2020CWE-416EPSS 0.40%

Overview

CVE-2020-29569 is a high-severity vulnerability. It was published on December 15, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.debian.org/debian-lts-announce/2021/02/msg00018.htmlReflists.debian.org/debian-lts-announce/2021/03/msg00010.htmlRefsecurity.gentoo.org/glsa/202107-30Refsecurity.netapp.com/advisory/ntap-20210205-0001/Refwww.debian.org/security/2021/dsa-4843Refxenbits.xenproject.org/xsa/advisory-350.htmlReflists.debian.org/debian-lts-announce/2021/02/msg00018.htmlReflists.debian.org/debian-lts-announce/2021/03/msg00010.htmlRefsecurity.gentoo.org/glsa/202107-30Refsecurity.netapp.com/advisory/ntap-20210205-0001/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-29569?

CVE-2020-29569 is a high-severity vulnerability. It was published on December 15, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2020-29569?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2020-29569?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-29569?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-29569 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2020

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
LiveWatch live →