UBUNTU-CVE-2021-20268

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    UBUNTU-CVE-2021-20268

    Published: 9 Mar 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-20268
    Aliases:
    USN-4910-1

    Summary:

    Details: An out-of-bounds access flaw was found in the Linux kernel's implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. This flaw allows a local user to crash the system or possibly escalate their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

    References: https://ubuntu.com/security/CVE-2021-20268, https://www.zerodayinitiative.com/advisories/ZDI-21-101/, https://git.kernel.org/linus/bc895e8b2a64e502fbba72748d59618272052a8b, https://ubuntu.com/security/notices/USN-4910-1, https://www.cve.org/CVERecord?id=CVE-2021-20268

    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-2021-20268 | CVE-DB