UBUNTU-CVE-2023-6683

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    UBUNTU-CVE-2023-6683

    Published: 12 Jan 2024Last Modified: 4 Feb 2026
    Upstream:
    CVE-2023-6683
    Aliases:
    USN-6954-1

    Summary:

    Details: A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. The qemu_clipboard_request() function can be reached before vnc_server_cut_text_caps() was called and had the chance to initialize the clipboard peer, leading to a NULL pointer dereference. This could allow a malicious authenticated VNC client to crash QEMU and trigger a denial of service.

    References: https://ubuntu.com/security/CVE-2023-6683, https://access.redhat.com/security/cve/CVE-2023-6683, https://lists.nongnu.org/archive/html/qemu-devel/2024-01/msg02382.html, https://www.cve.org/CVERecord?id=CVE-2023-6683, https://ubuntu.com/security/notices/USN-6954-1

    Affected packages

    Package

    Name: qemu

    Purl: pkg:deb/ubuntu/qemu@1:6.2+dfsg-2ubuntu6.22?arch=source&distro=jammy

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:6.2+dfsg-2ubuntu6.22

    Affected versions

    1:6.0+dfsg-2expubuntu1

    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