CVE-2021-22543

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.

CVSS v4.0

8.7 HIGHCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0

4.6 MEDIUMAV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS

0.66% chance of exploitation in the next 30 days, 49th percentile

Published

2021-05-26

Updated

2024-09-16

Proof-of-concept exploits (1)

• google/security-research/security/advisories/GHSA-7wq5-phmq-m584

References

• CVE Record
• NVD entry

Related

• CVE-2018-20840
• CVE-2020-8887
• CVE-2020-8911
• CVE-2020-8912
• CVE-2021-22555
• CVE-2021-39295