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CVE-2021-46968

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: fix zcard and zqueue hot-unplug memleak Tests with kvm and a kmemdebug kernel showed, that on hot unplug the zcard…

Published Feb 27, 2024CWE-401EPSS 0.22%

Overview

CVE-2021-46968 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

s390/zcrypt: fix zcard and zqueue hot-unplug memleak

Tests with kvm and a kmemdebug kernel showed, that on hot unplug the

zcard and zqueue structs for the unplugged card or queue are not

properly freed because of a mismatch with get/put for the embedded

kref counter.

This fix now adjusts the handling of the kref counters. With init the

kref counter starts with 1. This initial value needs to drop to zero

with the unregister of the card or queue to trigger the release and

free the object.

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

Refgit.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524Refgit.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599Refgit.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2Refgit.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3Refgit.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524Refgit.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599Refgit.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2Refgit.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46968?

CVE-2021-46968 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-46968?

This vulnerability has a CVSS 3.1 base score of 5.5, 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-2021-46968?

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-2021-46968?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46968 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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