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CVE-2021-22543

Severity8.7 High CVSS 4.0 3 scores
WeaknessBuffer errors (CWE-119)
Published26 May 2021
Updated17 Jun 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 5 years ago.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 0.66% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

8.7 HIGH v4.0 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/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 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 4.0 8.7 HIGH 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/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 cve-coordination@google.com Secondary published
CVSS 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H NVD Primary
CVSS 2.0 4.6 none AV:L/AC:L/Au:N/C:P/I:P/A:P NVD Primary

Affected software and releases

Products and versions

13 products, 14 version entries
SourceVendorProductSchemeAffected versions
nvd debian debian linux generic 9.0
nvd fedoraproject fedora generic 33 · 34
nvd linux linux kernel generic 2021-05-18
nvd netapp cloud backup generic any version
nvd netapp h300e firmware generic any version
nvd netapp h300s firmware generic any version
nvd netapp h410c firmware generic any version
nvd netapp h410s firmware generic any version
nvd netapp h500e firmware generic any version
nvd netapp h500s firmware generic any version
nvd netapp h700e firmware generic any version
nvd netapp h700s firmware generic any version
nvd netapp solidfire baseboard management controller firmware generic any version

References

URLTags
http://www.openwall.com/lists/oss-security/2021/06/26/1 Mailing List
https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584 Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html Mailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4G5YBUVEPHZYXMKNGBZ3S6INFCTEEL4E/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ROQIXQB7ZAWI3KSGSHR6H5RDUWZI775S/
https://security.netapp.com/advisory/ntap-20210708-0002/ Third Party Advisory

Timeline
Published2021-05-26By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.