UBUNTU-CVE-2021-20226

    Dashboard / Vulnerabilities / UBUNTU-CVE-2021-20226

    UBUNTU-CVE-2021-20226

    Published: 23 Feb 2021Last Modified: 24 Oct 2025
    Upstream:
    CVE-2021-20226

    Summary:

    Details: A use-after-free flaw was found in the io_uring in Linux kernel, where a local attacker with a user privilege could cause a denial of service problem on the system The issue results from the lack of validating the existence of an object prior to performing operations on the object by not incrementing the file reference counter while in use. The highest threat from this vulnerability is to data integrity, confidentiality and system availability.

    References: https://ubuntu.com/security/CVE-2021-20226, https://www.zerodayinitiative.com/advisories/ZDI-21-001/, https://www.openwall.com/lists/oss-security/2021/02/05/4, https://www.cve.org/CVERecord?id=CVE-2021-20226

    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-2021-20226 | CVE-DB