Is CVE-2018-18021 in the CISA KEV catalog?

No. CVE-2018-18021 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-18021?

CVE-2018-18021 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2018-18021?

CVE-2018-18021 has an EPSS score of 0.57% (43th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-18021?

Upgrade linux on debian 11 to 4.18.10-2 or later. Fixes are available for 54 affected products.

CVE & CISA-KEV Catalog

CVE-2018-18021

HIGH

7.1

CVSS v3

NVD

Description

arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.

CWE-20Improper Input Validation

How to fix

Remediation Available

linuxDebian

Fixed in:4.18.10-2CVE-2018-18021

linuxUbuntu

Fixed in:4.4.0-139.165USN-3821-1

Fixed in:4.15.0-47.50USN-3931-1

linux-awsUbuntu

Fixed in:4.4.0-1034.37USN-3821-2

Fixed in:4.4.0-1072.82USN-3821-1

Fixed in:4.15.0-1035.37USN-3931-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1035.37~16.04.1USN-3931-2

linux-azureUbuntu

Fixed in:4.15.0-1041.45~14.04.1USN-3931-2

Fixed in:4.15.0-1041.45USN-3931-2

linux-gcpUbuntu

Fixed in:4.15.0-1029.31~16.04.1USN-3931-2

Fixed in:4.15.0-1029.31USN-3931-1

linux-hweUbuntu

Fixed in:4.15.0-47.50~16.04.1USN-3931-2

linux-image-4.15.0-1010-oracleUbuntu

Fixed in:4.15.0-1010.12~16.04.1USN-3931-2

Fixed in:4.15.0-1010.12USN-3931-1

linux-image-4.15.0-1029-gcpUbuntu

Fixed in:4.15.0-1029.31~16.04.1USN-3931-2

Fixed in:4.15.0-1029.31USN-3931-1

linux-image-4.15.0-1031-kvmUbuntu

Fixed in:4.15.0-1031.31USN-3931-1

linux-image-4.15.0-1033-raspi2Ubuntu

Fixed in:4.15.0-1033.35USN-3931-1

linux-image-4.15.0-1035-awsUbuntu

Fixed in:4.15.0-1035.37~16.04.1USN-3931-2

Fixed in:4.15.0-1035.37USN-3931-1

linux-image-4.15.0-1035-oemUbuntu

Fixed in:4.15.0-1035.40USN-3931-1

linux-image-4.15.0-1041-azureUbuntu

Fixed in:4.15.0-1041.45~14.04.1USN-3931-2

Fixed in:4.15.0-1041.45USN-3931-2

linux-image-4.15.0-47-genericUbuntu

Fixed in:4.15.0-47.50~16.04.1USN-3931-2

Fixed in:4.15.0-47.50USN-3931-1

linux-image-4.15.0-47-generic-lpaeUbuntu

Fixed in:4.15.0-47.50~16.04.1USN-3931-2

Fixed in:4.15.0-47.50USN-3931-1

linux-image-4.15.0-47-lowlatencyUbuntu

Fixed in:4.15.0-47.50~16.04.1USN-3931-2

Fixed in:4.15.0-47.50USN-3931-1

linux-image-4.15.0-47-snapdragonUbuntu

Fixed in:4.15.0-47.50USN-3931-1

linux-image-4.4.0-1034-awsUbuntu

Fixed in:4.4.0-1034.37USN-3821-2

linux-image-4.4.0-1037-kvmUbuntu

Fixed in:4.4.0-1037.43USN-3821-1

linux-image-4.4.0-1072-awsUbuntu

Fixed in:4.4.0-1072.82USN-3821-1

linux-image-4.4.0-1100-raspi2Ubuntu

Fixed in:4.4.0-1100.108USN-3821-1

linux-image-4.4.0-1104-snapdragonUbuntu

Fixed in:4.4.0-1104.109USN-3821-1

linux-image-4.4.0-139-genericUbuntu

Fixed in:4.4.0-139.165~14.04.1USN-3821-2

Fixed in:4.4.0-139.165USN-3821-1

linux-image-4.4.0-139-generic-lpaeUbuntu

Fixed in:4.4.0-139.165~14.04.1USN-3821-2

Fixed in:4.4.0-139.165USN-3821-1

linux-image-4.4.0-139-lowlatencyUbuntu

Fixed in:4.4.0-139.165~14.04.1USN-3821-2

Fixed in:4.4.0-139.165USN-3821-1

linux-image-4.4.0-139-powerpc-e500mcUbuntu

Fixed in:4.4.0-139.165~14.04.1USN-3821-2

Fixed in:4.4.0-139.165USN-3821-1

linux-image-4.4.0-139-powerpc-smpUbuntu

Fixed in:4.4.0-139.165~14.04.1USN-3821-2

Fixed in:4.4.0-139.165USN-3821-1

linux-image-4.4.0-139-powerpc64-embUbuntu

Fixed in:4.4.0-139.165~14.04.1USN-3821-2

Fixed in:4.4.0-139.165USN-3821-1

linux-image-4.4.0-139-powerpc64-smpUbuntu

Fixed in:4.4.0-139.165~14.04.1USN-3821-2

Fixed in:4.4.0-139.165USN-3821-1

linux-image-awsUbuntu

Fixed in:4.15.0.1035.34USN-3931-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1035.35USN-3931-2

linux-image-azureUbuntu

Fixed in:4.15.0.1041.28USN-3931-2

Fixed in:4.15.0.1041.45USN-3931-2

linux-image-gcpUbuntu

Fixed in:4.15.0.1029.43USN-3931-2

Fixed in:4.15.0.1029.31USN-3931-1

linux-image-genericUbuntu

Fixed in:4.15.0.47.49USN-3931-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.47.68USN-3931-2

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.47.49USN-3931-1

linux-image-generic-lpae-hwe-16.04Ubuntu

Fixed in:4.15.0.47.68USN-3931-2

linux-image-gkeUbuntu

Fixed in:4.15.0.1029.43USN-3931-2

Fixed in:4.15.0.1029.31USN-3931-1

linux-image-kvmUbuntu

Fixed in:4.15.0.1031.31USN-3931-1

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.47.49USN-3931-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.47.68USN-3931-2

linux-image-oemUbuntu

Fixed in:4.15.0.47.68USN-3931-2

Fixed in:4.15.0.1035.40USN-3931-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1010.4USN-3931-2

Fixed in:4.15.0.1010.13USN-3931-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1033.31USN-3931-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.47.49USN-3931-1

linux-image-virtualUbuntu

Fixed in:4.15.0.47.49USN-3931-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.47.68USN-3931-2

linux-kvmUbuntu

Fixed in:4.4.0-1037.43USN-3821-1

Fixed in:4.15.0-1031.31USN-3931-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-139.165~14.04.1USN-3821-2

linux-oemUbuntu

Fixed in:4.15.0-1035.40USN-3931-1

linux-oracleUbuntu

Fixed in:4.15.0-1010.12~16.04.1USN-3931-2

Fixed in:4.15.0-1010.12USN-3931-1

linux-raspi2Ubuntu

Fixed in:4.4.0-1100.108USN-3821-1

Fixed in:4.15.0-1033.35USN-3931-1

linux-snapdragonUbuntu

Fixed in:4.4.0-1104.109USN-3821-1

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

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Exploit Intelligence

0.57%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

References

Patch6

Third-Party Advisory5

Other references2

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

Embed a live status badge for CVE-2018-18021

Markdown

[![CVE-2018-18021](https://tridentstack.com/cve/badge/CVE-2018-18021.svg)](https://tridentstack.com/cve/CVE-2018-18021)

HTML

<a href="https://tridentstack.com/cve/CVE-2018-18021"><img src="https://tridentstack.com/cve/badge/CVE-2018-18021.svg" alt="CVE-2018-18021"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.