UBUNTU-CVE-2021-20239

    Dashboard / Vulnerabilities / UBUNTU-CVE-2021-20239

    UBUNTU-CVE-2021-20239

    Published: 17 Feb 2021Last Modified: 9 Sept 2026
    Upstream:
    CVE-2021-20239

    Summary:

    Details: A flaw was found in the Linux kernel in versions before 5.4.92 in the BPF protocol. This flaw allows an attacker with a local account to leak information about kernel internal addresses. The highest threat from this vulnerability is to confidentiality.

    References: https://ubuntu.com/security/CVE-2021-20239, https://www.zerodayinitiative.com/advisories/ZDI-21-100/, https://gist.github.com/Ga-ryo/2ec958e78f55c5d18558960f3fe1c6ec, https://ubuntu.com/security/notices/USN-4878-1, https://ubuntu.com/security/notices/USN-4910-1, https://www.cve.org/CVERecord?id=CVE-2021-20239

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/linux-hwe-edge?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-2021-20239 | CVE-DB