VULNERABILITY

Amazon Linux AMI: CVE-2021-22543: Security patch for kernel (ALAS-2021-1539)

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Amazon Linux AMI: CVE-2021-22543: Security patch for kernel (ALAS-2021-1539)

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:P/I:P/A:P)
Published
05/26/2021
Created
10/07/2021
Added
10/05/2021
Modified
10/14/2022

Description

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.

Solution(s)

  • amazon-linux-upgrade-kernel

References

  • ALAS-2021-1539
  • CVE-2021-22543
  • USN-5070-1
  • USN-5071-1
  • USN-5071-2
  • USN-5071-3
  • USN-5094-1
  • USN-5094-2
  • USN-5106-1
  • USN-5120-1
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