CVE-2021-22543 HIGH

CVE-2021-22543: Improper memory handling in Linux KVM

Vendor Linux Kernel
Product Linux Kernel
Weakness CWE-119
Published May 26, 2021
Last update September 16, 2024

CVSS base score

8.7/10
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 26, 2021 CVE published
September 16, 2024 Record updated