USN-6555-2

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    USN-6555-2

    Published: 13 Dec 2023Last Modified: 25 Jun 2026

    Summary: xorg-server vulnerabilities

    Details: USN-6555-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Original advisory details: Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled XKB button actions. An attacker could possibly use this issue to cause the X Server to crash, execute arbitrary code, or escalate privileges. (CVE-2023-6377) Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled memory when processing the RRChangeOutputProperty and RRChangeProviderProperty APIs. An attacker could possibly use this issue to cause the X Server to crash, or obtain sensitive information. (CVE-2023-6478)

    References: https://ubuntu.com/security/notices/USN-6555-2, https://ubuntu.com/security/CVE-2023-6377, https://ubuntu.com/security/CVE-2023-6478

    Affected packages

    Package

    Name: xorg-server

    Purl: pkg:deb/ubuntu/xorg-server?arch=source&distro=esm-infra%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2:1.18.4-0ubuntu0.12+esm8

    Affected versions

    2:1.17.2-1ubuntu9
    2:1.17.2-1ubuntu10
    2:1.17.3-2ubuntu1
    2:1.17.3-2ubuntu2
    2:1.17.3-2ubuntu3
    2:1.17.3-2ubuntu4

    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
    USN-6555-2 | CVE-DB