UBUNTU-CVE-2021-46968

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    UBUNTU-CVE-2021-46968

    Published: 27 Feb 2024Last Modified: 24 Oct 2025
    Upstream:
    CVE-2021-46968

    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://ubuntu.com/security/CVE-2021-46968, https://git.kernel.org/linus/70fac8088cfad9f3b379c9082832b4d7532c16c2, 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, https://www.cve.org/CVERecord?id=CVE-2021-46968

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.8.0-28.30~16.04.1
    4.8.0-30.32~16.04.1
    4.8.0-32.34~16.04.1
    4.8.0-34.36~16.04.1

    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
    UBUNTU-CVE-2021-46968 | CVE-DB