CVE-2021-22543

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    CVE-2021-22543

    Published: 26 May 2021Last Modified: 16 Apr 2026

    Summary:

    Details: An issue was discovered in Linux: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages being freed while still accessible by the VMM and guest. This allows users with the ability to start and control a VM to read/write random pages of memory and can result in local privilege escalation.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4G5YBUVEPHZYXMKNGBZ3S6INFCTEEL4E/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ROQIXQB7ZAWI3KSGSHR6H5RDUWZI775S/, https://security.netapp.com/advisory/ntap-20210708-0002/, https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html, https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html, http://www.openwall.com/lists/oss-security/2021/06/26/1, https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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
    CVE-2021-22543 | CVE-DB