Vulnerability CVE-2021-46968
Published: 2024-02-27

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.

 References:
https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524
https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599
https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3
https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2
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