CVE-2021-46968

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    CVE-2021-46968

    Published: 27 Feb 2024Last Modified: 15 Mar 2026

    Summary:

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

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-46968 | CVE-DB