CVE-2021-46968

low-risk
Published 2024-02-27

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.

Do I need to act?

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0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Linux

References (8)

Patch https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524
Patch https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599
Patch https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2
Patch https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3
Patch https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524
Patch https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599
Patch https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2
Patch https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3
23
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal