UBUNTU-CVE-2021-46967

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    UBUNTU-CVE-2021-46967

    Published: 27 Feb 2024Last Modified: 6 Aug 2026
    Upstream:
    CVE-2021-46967

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: vhost-vdpa: fix vm_flags for virtqueue doorbell mapping The virtqueue doorbell is usually implemented via registeres but we don't provide the necessary vma->flags like VM_PFNMAP. This may cause several issues e.g when userspace tries to map the doorbell via vhost IOTLB, kernel may panic due to the page is not backed by page structure. This patch fixes this by setting the necessary vm_flags. With this patch, try to map doorbell via IOTLB will fail with bad address.

    References: https://ubuntu.com/security/CVE-2021-46967, https://git.kernel.org/linus/3a3e0fad16d40a2aa68ddf7eea4acdf48b22dd44, https://git.kernel.org/stable/c/3b8b6399666a29daa30b0bb3f5c9e3fc81c5a6a6, https://git.kernel.org/stable/c/940230a5c31e2714722aee04c521a21f484b4df7, https://git.kernel.org/stable/c/93dbbf20e3ffad14f04227a0b7105f6e6f0387ce, https://git.kernel.org/stable/c/3a3e0fad16d40a2aa68ddf7eea4acdf48b22dd44, https://www.cve.org/CVERecord?id=CVE-2021-46967

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/linux-hwe-edge?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-2021-46967 | CVE-DB