UBUNTU-CVE-2018-16882

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    UBUNTU-CVE-2018-16882

    Published: 3 Jan 2019Last Modified: 22 Apr 2026
    Upstream:
    CVE-2018-16882
    Aliases:
    USN-3871-1
    USN-3871-3
    USN-3871-4

    Summary:

    Details: A use-after-free issue was found in the way the Linux kernel's KVM hypervisor processed posted interrupts when nested(=1) virtualization is enabled. In nested_get_vmcs12_pages(), in case of an error while processing posted interrupt address, it unmaps the 'pi_desc_page' without resetting 'pi_desc' descriptor address, which is later used in pi_test_and_clear_on(). A guest user/process could use this flaw to crash the host kernel resulting in DoS or potentially gain privileged access to a system. Kernel versions before 4.14.91 and before 4.19.13 are vulnerable.

    References: https://ubuntu.com/security/CVE-2018-16882, https://www.openwall.com/lists/oss-security/2018/12/18/6, https://marc.info/?l=kvm&m=154514994222809&w=2, https://ubuntu.com/security/notices/USN-3871-1, https://ubuntu.com/security/notices/USN-3872-1, https://ubuntu.com/security/notices/USN-3871-3, https://ubuntu.com/security/notices/USN-3871-4, https://ubuntu.com/security/notices/USN-3878-1, https://ubuntu.com/security/notices/USN-3871-5, https://ubuntu.com/security/notices/USN-3878-2, https://www.cve.org/CVERecord?id=CVE-2018-16882

    Affected packages

    Package

    Name: linux-azure

    Purl: pkg:deb/ubuntu/[email protected]~14.04.2?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.15.0-1037.39~14.04.2

    Affected versions

    4.15.0-1023.24~14.04.1
    4.15.0-1030.31~14.04.1
    4.15.0-1031.32~14.04.1
    4.15.0-1032.33~14.04.2
    4.15.0-1035.36~14.04.2
    4.15.0-1036.38~14.04.2

    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-2018-16882 | CVE-DB