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CVE-2021-28038

6.5 · MEDIUM

An issue was discovered in the Linux kernel through 5.11.3, as used with Xen PV.

Published Mar 5, 2021CWE-770EPSS 0.71%

Overview

CVE-2021-28038 is a medium-severity vulnerability. It was published on March 5, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. 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 5.11.3, as used with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations (as a result of changes to the handling of grant mapping errors). A host OS denial of service may occur during misbehavior of a networking frontend driver. NOTE: this issue exists because of an incomplete fix for CVE-2021-26931.

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

Refwww.openwall.com/lists/oss-security/2021/03/05/1Refxenbits.xen.org/xsa/advisory-367.htmlRefgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2991397d23ec597405b116d96de3813420bdcbc3Reflists.debian.org/debian-lts-announce/2021/03/msg00010.htmlReflists.debian.org/debian-lts-announce/2021/03/msg00035.htmlRefsecurity.netapp.com/advisory/ntap-20210409-0001/Refwww.openwall.com/lists/oss-security/2021/03/05/1Refxenbits.xen.org/xsa/advisory-367.htmlRefgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2991397d23ec597405b116d96de3813420bdcbc3Reflists.debian.org/debian-lts-announce/2021/03/msg00010.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-28038?

CVE-2021-28038 is a medium-severity vulnerability. It was published on March 5, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-28038?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-28038?

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-2021-28038?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-28038 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.

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