QID 198504

Date Published: 2021-09-22

QID 198504: Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-5082-1)

The kvm hypervisor implementation for amd processors in the linux kernel allowed a guest vm to disable restrictions on vmload/vmsave in a nested guest.
The kvm hypervisor implementation for amd processors in the linux kernel did not properly prevent a guest vm from enabling avic in nested guest vms.
Race condition in the can bcm networking protocol of the linux kernel leading to multiple use-after-free vulnerabilities.

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.

an attacker in a guest vm could use this to read or write portions of the host's physical memory. (
Cve-2021-3656).
An attacker in a guest vm could use this to write to portions of the host's physical memory. (
Cve-2021-3653).
A local attacker could use this issue to execute arbitrary code. (
Cve-2021-3609).

  • CVSS V3 rated as Medium - 4.2 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Refer to Ubuntu advisory: USN-5082-1 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 198504

    CVE-2021-3653 | CVE-2021-3609 | CVE-2021-3656 |
    Software Advisories
    Advisory ID Software Component Link
    USN-5082-1 Ubuntu Linux URL Logo ubuntu.com/security/notices/USN-5082-1
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