UBUNTU-CVE-2021-45100

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    UBUNTU-CVE-2021-45100

    Published: 16 Dec 2021Last Modified: 24 Oct 2025
    Upstream:
    CVE-2021-45100

    Summary:

    Details: The ksmbd server through 3.4.2, as used in the Linux kernel through 5.15.8, sometimes communicates in cleartext even though encryption has been enabled. This occurs because it sets the SMB2_GLOBAL_CAP_ENCRYPTION flag when using the SMB 3.1.1 protocol, which is a violation of the SMB protocol specification. When Windows 10 detects this protocol violation, it disables encryption.

    References: https://ubuntu.com/security/CVE-2021-45100, https://github.com/cifsd-team/ksmbd/issues/550, https://github.com/cifsd-team/ksmbd/pull/551, https://marc.info/?l=linux-kernel&m=163961726017023&w=2, https://www.cve.org/CVERecord?id=CVE-2021-45100

    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-2021-45100 | CVE-DB