UBUNTU-CVE-2021-46923

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    UBUNTU-CVE-2021-46923

    Published: 27 Feb 2024Last Modified: 24 Oct 2025
    Upstream:
    CVE-2021-46923

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: fs/mount_setattr: always cleanup mount_kattr Make sure that finish_mount_kattr() is called after mount_kattr was succesfully built in both the success and failure case to prevent leaking any references we took when we built it. We returned early if path lookup failed thereby risking to leak an additional reference we took when building mount_kattr when an idmapped mount was requested.

    References: https://ubuntu.com/security/CVE-2021-46923, https://git.kernel.org/linus/012e332286e2bb9f6ac77d195f17e74b2963d663, https://git.kernel.org/stable/c/47b5d0a7532d39e42a938f81e3904268145c341d, https://git.kernel.org/stable/c/012e332286e2bb9f6ac77d195f17e74b2963d663, https://www.cve.org/CVERecord?id=CVE-2021-46923

    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-2021-46923 | CVE-DB