QID 352799

Date Published: 2021-09-13

QID 352799: Amazon Linux Security Advisory for kernel: ALAS2-2021-1699

A flaw was found in the linux kernel's kvm implementation, where improper handing of the vm_io|vm_pfnmap vmas in kvm bypasses ro checks and leads to pages being freed while still accessible by the vmm and guest.
This flaw allows users who can start and control a vm to read/write random pages of memory, resulting in local privilege escalation.
The highest threat from this vulnerability is to confidentiality, integrity, and system availability. (
( CVE-2021-22543)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as Medium - 4.6 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2021-1699 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352799

    CVE-2021-22543 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2021-1699 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2021-1699.html
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