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CVE-2021-46968 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524	kernel.org	Patch
https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599	kernel.org	Patch
https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2	kernel.org	Patch
https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3	kernel.org	Patch
https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524	CVE	Patch
https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599	CVE	Patch
https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2	CVE	Patch
https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3	CVE	Patch

see all 8 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-401	Missing Release of Memory after Effective Lifetime	[email protected]

Affected Products

Product	Versions
linux linux kernel	>= 5.10, < 5.10.36 >= 5.11, < 5.11.20 >= 5.12, < 5.12.3
CPE cpe:2.3:o:linux:linux_kernel:::::::: Remediation No remediation found in references.

Change History

7 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	kernel.org
Jun 17, 2026	CVE Modified	CISA-ADP
Jan 8, 2025	Initial Analysis	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 28, 2024	CVE Modified	kernel.org
May 14, 2024	CVE Modified	kernel.org
Feb 27, 2024	New CVE Received	kernel.org