What is CVE-2018-18021?

CVE-2018-18021 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, classified as a Improper Input Validation flaw (CWE-20). CVE-2018-18021 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

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

CVE-2018-18021 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

Is there a patch available for CVE-2018-18021?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2018-18021 patch availability.

Is CVE-2018-18021 actively exploited?

CVE-2018-18021 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2018-18021

High

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.

Package Linux Kernel

Published 2018-10-07

Last modified 2024-11-21

CVSS version 3.0

Patch available

Awaiting data

CVSS 3.0 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-20

CVE-2018-18021 is a Improper Input Validation vulnerability

What is Improper Input Validation?

The product receives input but does not validate it correctly, allowing attackers to craft inputs that cause unexpected behavior. Learn more on MITRE CWE

References

13 total

Kernel Git
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a3f93459d689d990b3ecfbe782fec89b97d3279

Patch
Kernel Git
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d26c25a9d19b5976b319af528886f89cf455692d

Patch
Kernel.org
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12

Patch
GitHub
https://github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279

Patch
GitHub
https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d

Patch

Showing 5 of 13 references View all on NVD

Details

CVE ID CVE-2018-18021

Severity High

CVSS score 7.1 / 10

CVSS version 3.0

Published 2018-10-07

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2018-18021?

CVE-2018-18021 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 , classified as an Improper Input Validation flaw (CWE-20) . CVE-2018-18021 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2018-18021?

CVE-2018-18021 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 3.0). The vector string is CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
Is there a patch available for CVE-2018-18021?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2018-18021 patch availability.
Is CVE-2018-18021 actively exploited?

No. CVE-2018-18021 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.