CVE-2021-46968

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.

• CWE-401

• https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524Patch
• https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599Patch
• https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2Patch
• https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3Patch
• https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524Patch
• https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599Patch
• https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2Patch
• https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3Patch

Published

Feb 27, 2024

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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