CVE-2021-38198: debian debian_linux

CVSS: 5.5v3.1MediumModified

AliasesUBUNTU-CVE-2021-38198DEBIAN-CVE-2021-38198

Published 08-08-2021Last modified 08-10-2026

Vulnerability summary

CVE-2021-38198 is a medium (CVSS 5.5) vulnerability in debian debian_linux. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 37.8% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk

32/100

0100

Medium · default modelHow is this calculated?

CVSS score

5.5/10

010

Medium · v3.1 (NVD)

EPSS score

0.45%

0%100%

Low · -0.02 pp in 30 days

KEVNot listedIn no KEV catalog

RansomwareNone recordedNo known use recorded

Public exploits1github

Timeline

08-08-2021
PublishedVulnerability first disclosed.
08-10-2026
Last modifiedVulnerability information updated.

Description

arch/x86/kvm/mmu/paging_tmpl.h in the Linux kernel before 5.12.11 incorrectly computes the access permissions of a shadow page, leading to a missing guest protection page fault.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.15.5v2.02.1

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

-0.02 pp

From 0.47% on 20-09-2026

20-09-202620-10-2026

EPSS score

0.45%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found

githubUnverified
Linux
Maturity: poc

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu60 products

linuxAll versions (No fix recorded) | < 4.4.0-222.255 | < 4.15.0-161.169 | < 5.4.0-89.100
linux-aws< 4.4.0-1102.107 | < 4.4.0-1138.152 | < 4.15.0-1114.121 | < 5.4.0-1058.61
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11< 5.11.0-1016.17~20.04.1
linux-aws-5.3All versions (No fix recorded)

linux-aws-5.4< 5.4.0-1058.61~18.04.3
linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 4.15.0-2055.57 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1113.120~16.04.1
linux-azure< 4.15.0-1125.138~14.04.1 | < 4.15.0-1125.138~16.04.1 | All versions (No fix recorded) | < 5.4.0-1062.65
linux-azure-4.15< 4.15.0-1125.138
linux-azure-5.11< 5.11.0-1013.14~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1062.65~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 4.15.0-2037.41 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1020.23
linux-dell300x< 4.15.0-1029.34
linux-fips< 4.4.0-1072.78 | All versions (No fix recorded) | < 4.15.0-1071.80 | < 5.4.0-1035.41
linux-gcp< 4.15.0-1110.124~16.04.1 | All versions (No fix recorded) | < 5.4.0-1056.60
linux-gcp-4.15< 4.15.0-1110.124
linux-gcp-5.11< 5.11.0-1017.19~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1056.60~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-edgeAll versions (No fix recorded)
linux-gcp-fips< 4.15.0-2020.22 | All versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1054.57
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1054.57~18.04.1
linux-gkeop< 5.4.0-1025.26
linux-gkeop-5.4< 5.4.0-1025.26~18.04.1
linux-hwe< 4.15.0-161.169~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11< 5.11.0-34.36~20.04.1
linux-hwe-5.4< 5.4.0-89.100~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1006.7
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.4.0-1103.112 | < 4.15.0-1101.103 | < 5.4.0-1048.50
linux-lts-xenial< 4.4.0-222.255~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1038.40
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1082.90~16.04.1 | < 4.15.0-1082.90 | < 5.4.0-1056.60
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11< 5.11.0-1016.17~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1056.60~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1045.49
linux-raspi-5.4< 5.4.0-1045.49~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1097.103 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11< 5.11.0-1017.18~20.04.1
linux-riscv-5.8All versions (No fix recorded)
linux-snapdragon< 4.15.0-1114.123