UBUNTU-CVE-2021-43056

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    UBUNTU-CVE-2021-43056

    Published: 28 Oct 2021Last Modified: 9 Sept 2026
    Upstream:
    CVE-2021-43056
    Aliases:
    USN-5139-1
    USN-5165-1
    USN-5208-1

    Summary:

    Details: An issue was discovered in the Linux kernel for powerpc before 5.14.15. It allows a malicious KVM guest to crash the host, when the host is running on Power8, due to an arch/powerpc/kvm/book3s_hv_rmhandlers.S implementation bug in the handling of the SRR1 register values.

    References: https://ubuntu.com/security/CVE-2021-43056, https://git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337, https://git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337, https://lore.kernel.org/linuxppc-dev/[email protected]/T/#u, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15, http://www.openwall.com/lists/oss-security/2021/10/28/1, https://ubuntu.com/security/notices/USN-5139-1, https://ubuntu.com/security/notices/USN-5165-1, https://ubuntu.com/security/notices/USN-5208-1, https://ubuntu.com/security/notices/USN-5210-1, https://ubuntu.com/security/notices/USN-5218-1, https://www.cve.org/CVERecord?id=CVE-2021-43056

    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-2021-43056 | CVE-DB