UBUNTU-CVE-2021-47046

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    UBUNTU-CVE-2021-47046

    Published: 28 Feb 2024Last Modified: 24 Oct 2025
    Upstream:
    CVE-2021-47046

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix off by one in hdmi_14_process_transaction() The hdcp_i2c_offsets[] array did not have an entry for HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE so it led to an off by one read overflow. I added an entry and copied the 0x0 value for the offset from similar code in drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c. I also declared several of these arrays as having HDCP_MESSAGE_ID_MAX entries. This doesn't change the code, but it's just a belt and suspenders approach to try future proof the code.

    References: https://ubuntu.com/security/CVE-2021-47046, https://git.kernel.org/linus/8e6fafd5a22e7a2eb216f5510db7aab54cc545c1, https://git.kernel.org/stable/c/403c4528e5887af3deb9838cb77a557631d1e138, https://git.kernel.org/stable/c/6a58310d5d1e5b02d0fc9b393ba540c9367bced5, https://git.kernel.org/stable/c/080bd41d6478a64edf96704fddcda52b1fd5fed7, https://git.kernel.org/stable/c/8e6fafd5a22e7a2eb216f5510db7aab54cc545c1, https://www.cve.org/CVERecord?id=CVE-2021-47046

    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-2021-47046 | CVE-DB