UBUNTU-CVE-2021-3543

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    UBUNTU-CVE-2021-3543

    Published: 1 Jun 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-3543

    Summary:

    Details: A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.

    References: https://ubuntu.com/security/CVE-2021-3543, https://git.kernel.org/linus/f1ce3986baa62cffc3c5be156994de87524bab99, https://ubuntu.com/security/notices/USN-4997-1, https://ubuntu.com/security/notices/USN-5001-1, https://ubuntu.com/security/notices/USN-4997-2, https://www.cve.org/CVERecord?id=CVE-2021-3543

    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-2021-3543 | CVE-DB