Is CVE-2021-22543 in the CISA KEV catalog?

No. CVE-2021-22543 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22543?

CVE-2021-22543 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-22543?

CVE-2021-22543 has an EPSS score of 0.66% (47th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22543?

Upgrade linux on debian 11 to 5.10.46-2 or later. Fixes are available for 106 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22543

HIGH

7.8

CVSS v3

NVD

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.

CWE-119Buffer Overflow

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.46-2CVE-2021-22543

linuxUbuntu

Fixed in:4.15.0-159.167USN-5094-1

Fixed in:5.4.0-84.94USN-5071-1

linux-awsUbuntu

Fixed in:4.15.0-1112.119USN-5094-1

Fixed in:5.4.0-1056.59USN-5071-1

linux-aws-5.11Ubuntu

Fixed in:5.11.0-1017.18~20.04.1USN-5070-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1056.59~18.04.1USN-5071-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1112.119~16.04.1USN-5094-1

linux-azureUbuntu

Fixed in:4.15.0-1124.137~14.04.1USN-5094-1

Fixed in:4.15.0-1124.137~16.04.1USN-5094-1

Fixed in:5.4.0-1058.60USN-5071-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1124.137USN-5094-1

linux-azure-5.11Ubuntu

Fixed in:5.11.0-1015.16~20.04.1USN-5070-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1058.60~18.04.1USN-5071-1

linux-azure-5.8Ubuntu

Fixed in:5.8.0-1043.46~20.04.1USN-5120-1

linux-dell300xUbuntu

Fixed in:4.15.0-1028.33USN-5094-1

linux-gcpUbuntu

Fixed in:4.15.0-1109.123~16.04.1USN-5094-1

Fixed in:5.4.0-1052.56USN-5071-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1109.123USN-5094-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1052.56~18.04.1USN-5071-1

linux-gkeUbuntu

Fixed in:5.4.0-1052.55USN-5071-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1052.55~18.04.1USN-5071-1

linux-gkeopUbuntu

Fixed in:5.4.0-1023.24USN-5071-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1023.24~18.04.1USN-5071-1

linux-hweUbuntu

Fixed in:4.15.0-159.167~16.04.1USN-5094-1

linux-hwe-5.11Ubuntu

Fixed in:5.11.0-34.36~20.04.1USN-5070-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-84.94~18.04.1USN-5071-2

linux-image-4.15.0-1028-dell300xUbuntu

Fixed in:4.15.0-1028.33USN-5094-1

linux-image-4.15.0-1081-oracleUbuntu

Fixed in:4.15.0-1081.89~16.04.1USN-5094-1

Fixed in:4.15.0-1081.89USN-5094-1

linux-image-4.15.0-1096-raspi2Ubuntu

Fixed in:4.15.0-1096.102USN-5094-2

linux-image-4.15.0-1100-kvmUbuntu

Fixed in:4.15.0-1100.102USN-5094-1

linux-image-4.15.0-1109-gcpUbuntu

Fixed in:4.15.0-1109.123~16.04.1USN-5094-1

Fixed in:4.15.0-1109.123USN-5094-1

linux-image-4.15.0-1112-awsUbuntu

Fixed in:4.15.0-1112.119~16.04.1USN-5094-1

Fixed in:4.15.0-1112.119USN-5094-1

linux-image-4.15.0-1113-snapdragonUbuntu

Fixed in:4.15.0-1113.122USN-5094-1

linux-image-4.15.0-1124-azureUbuntu

Fixed in:4.15.0-1124.137~14.04.1USN-5094-1

Fixed in:4.15.0-1124.137~16.04.1USN-5094-1

Fixed in:4.15.0-1124.137USN-5094-1

linux-image-4.15.0-159-genericUbuntu

Fixed in:4.15.0-159.167~16.04.1USN-5094-1

Fixed in:4.15.0-159.167USN-5094-1

linux-image-4.15.0-159-generic-lpaeUbuntu

Fixed in:4.15.0-159.167USN-5094-1

linux-image-4.15.0-159-lowlatencyUbuntu

Fixed in:4.15.0-159.167~16.04.1USN-5094-1

Fixed in:4.15.0-159.167USN-5094-1

linux-image-5.10.0-1049-oemUbuntu

Fixed in:5.10.0-1049.51USN-5106-1

linux-image-5.11.0-1015-azureUbuntu

Fixed in:5.11.0-1015.16~20.04.1USN-5070-1

linux-image-5.11.0-1017-awsUbuntu

Fixed in:5.11.0-1017.18~20.04.1USN-5070-1

linux-image-5.11.0-1017-oracleUbuntu

Fixed in:5.11.0-1017.18~20.04.1USN-5070-1

linux-image-5.11.0-34-genericUbuntu

Fixed in:5.11.0-34.36~20.04.1USN-5070-1

linux-image-5.11.0-34-generic-64kUbuntu

Fixed in:5.11.0-34.36~20.04.1USN-5070-1

linux-image-5.11.0-34-generic-lpaeUbuntu

Fixed in:5.11.0-34.36~20.04.1USN-5070-1

linux-image-5.11.0-34-lowlatencyUbuntu

Fixed in:5.11.0-34.36~20.04.1USN-5070-1

linux-image-5.4.0-1023-gkeopUbuntu

Fixed in:5.4.0-1023.24~18.04.1USN-5071-1

Fixed in:5.4.0-1023.24USN-5071-1

linux-image-5.4.0-1043-raspiUbuntu

Fixed in:5.4.0-1043.47~18.04.1USN-5071-3

Fixed in:5.4.0-1043.47USN-5071-3

linux-image-5.4.0-1046-kvmUbuntu

Fixed in:5.4.0-1046.48USN-5071-1

linux-image-5.4.0-1052-gcpUbuntu

Fixed in:5.4.0-1052.56~18.04.1USN-5071-1

Fixed in:5.4.0-1052.56USN-5071-1

linux-image-5.4.0-1052-gkeUbuntu

Fixed in:5.4.0-1052.55~18.04.1USN-5071-1

Fixed in:5.4.0-1052.55USN-5071-1

linux-image-5.4.0-1054-oracleUbuntu

Fixed in:5.4.0-1054.58~18.04.1USN-5071-1

Fixed in:5.4.0-1054.58USN-5071-1

linux-image-5.4.0-1056-awsUbuntu

Fixed in:5.4.0-1056.59~18.04.1USN-5071-1

Fixed in:5.4.0-1056.59USN-5071-1

linux-image-5.4.0-1058-azureUbuntu

Fixed in:5.4.0-1058.60~18.04.1USN-5071-1

Fixed in:5.4.0-1058.60USN-5071-1

linux-image-5.4.0-84-genericUbuntu

Fixed in:5.4.0-84.94~18.04.1USN-5071-2

Fixed in:5.4.0-84.94USN-5071-1

linux-image-5.4.0-84-generic-lpaeUbuntu

Fixed in:5.4.0-84.94~18.04.1USN-5071-2

Fixed in:5.4.0-84.94USN-5071-1

linux-image-5.4.0-84-lowlatencyUbuntu

Fixed in:5.4.0-84.94~18.04.1USN-5071-2

Fixed in:5.4.0-84.94USN-5071-1

linux-image-5.8.0-1043-azureUbuntu

Fixed in:5.8.0-1043.46~20.04.1USN-5120-1

linux-image-awsUbuntu

Fixed in:5.4.0.1056.39USN-5071-1

Fixed in:5.11.0.1017.18~20.04.16USN-5070-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1112.103USN-5094-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1112.115USN-5094-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1056.59USN-5071-1

linux-image-azureUbuntu

Fixed in:4.15.0.1124.97USN-5094-1

Fixed in:4.15.0.1124.115USN-5094-1

Fixed in:5.4.0.1058.38USN-5071-1

Fixed in:5.8.0.1043.46~20.04.15USN-5120-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1124.97USN-5094-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1058.56USN-5071-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1028.30USN-5094-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1109.110USN-5094-1

Fixed in:5.4.0.1052.38USN-5071-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1109.128USN-5094-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1052.62USN-5071-1

linux-image-genericUbuntu

Fixed in:4.15.0.159.148USN-5094-1

Fixed in:5.4.0.84.88USN-5071-1

linux-image-generic-64k-hwe-20.04Ubuntu

Fixed in:5.11.0.34.36~20.04.13USN-5070-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.159.152USN-5094-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.84.94~18.04.75USN-5071-2

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.11.0.34.36~20.04.13USN-5070-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.159.148USN-5094-1

Fixed in:5.4.0.84.88USN-5071-1

linux-image-generic-lpae-hwe-18.04Ubuntu

Fixed in:5.4.0.84.94~18.04.75USN-5071-2

linux-image-generic-lpae-hwe-20.04Ubuntu

Fixed in:5.11.0.34.36~20.04.13USN-5070-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1109.110USN-5094-1

Fixed in:5.4.0.1052.62USN-5071-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1052.55~18.04.17USN-5071-1

Fixed in:5.4.0.1052.62USN-5071-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1023.26USN-5071-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1023.24~18.04.24USN-5071-1

Fixed in:5.4.0.1023.26USN-5071-1

linux-image-kvmUbuntu

Fixed in:4.15.0.1100.96USN-5094-1

Fixed in:5.4.0.1046.45USN-5071-1

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.159.148USN-5094-1

Fixed in:5.4.0.84.88USN-5071-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.159.152USN-5094-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.84.94~18.04.75USN-5071-2

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.11.0.34.36~20.04.13USN-5070-1

linux-image-oemUbuntu

Fixed in:4.15.0.159.152USN-5094-1

Fixed in:5.4.0.84.94~18.04.75USN-5071-2

Fixed in:5.4.0.84.88USN-5071-1

linux-image-oem-20.04Ubuntu

Fixed in:5.10.0.1049.51USN-5106-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1049.51USN-5106-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.84.94~18.04.75USN-5071-2

Fixed in:5.4.0.84.88USN-5071-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1081.69USN-5094-1

Fixed in:5.4.0.1054.58~18.04.34USN-5071-1

Fixed in:5.11.0.1017.18~20.04.10USN-5070-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1081.91USN-5094-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1054.54USN-5071-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1043.78USN-5071-3

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1043.46USN-5071-3

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1096.94USN-5094-2

Fixed in:5.4.0.1043.78USN-5071-3

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1113.116USN-5094-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.84.94~18.04.75USN-5071-2

linux-image-virtualUbuntu

Fixed in:4.15.0.159.148USN-5094-1

Fixed in:5.4.0.84.88USN-5071-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.159.152USN-5094-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.84.94~18.04.75USN-5071-2

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.11.0.34.36~20.04.13USN-5070-1

linux-kvmUbuntu

Fixed in:4.15.0-1100.102USN-5094-1

Fixed in:5.4.0-1046.48USN-5071-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1049.51USN-5106-1

linux-oracleUbuntu

Fixed in:4.15.0-1081.89~16.04.1USN-5094-1

Fixed in:4.15.0-1081.89USN-5094-1

Fixed in:5.4.0-1054.58USN-5071-1

linux-oracle-5.11Ubuntu

Fixed in:5.11.0-1017.18~20.04.1USN-5070-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1054.58~18.04.1USN-5071-1

linux-raspiUbuntu

Fixed in:5.4.0-1043.47USN-5071-3

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1043.47~18.04.1USN-5071-3

linux-raspi2Ubuntu

Fixed in:4.15.0-1096.102USN-5094-2

linux-snapdragonUbuntu

Fixed in:4.15.0-1113.122USN-5094-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.66%probability of exploitation in 30 days

47thpercentile

Moderate risk: more likely to be exploited than 47% of all known CVEs.

References

Exploit1

github.com

Third-Party Advisory3

Mailing List1

openwall.com

Other references2

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.