VULNERABILITY INTELLIGENCE
CVE-2021-22543
CVSS score7.8 HIGH
EPSS probability0.66%
CISA KEVNot currently listed
Published2021-05-26
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
Weakness classification
- cve-coordination@google.com: CWE-119
- nvd@nist.gov: CWE-119
Primary references
- cve-coordination@google.com — Mailing List
- cve-coordination@google.com — Exploit, Third Party Advisory
- cve-coordination@google.com — Mailing List, Third Party Advisory
- cve-coordination@google.com — Mailing List, Third Party Advisory
- cve-coordination@google.com
- cve-coordination@google.com
- cve-coordination@google.com — Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Mailing List
- af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108