Is CVE-2018-18397 in the CISA KEV catalog?

No. CVE-2018-18397 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-18397?

CVE-2018-18397 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2018-18397?

CVE-2018-18397 has an EPSS score of 0.51% (40th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-18397?

Upgrade linux on debian 11 to 4.19.9-1 or later. Fixes are available for 47 affected products.

CVE & CISA-KEV Catalog

CVE-2018-18397

MEDIUM

5.5

CVSS v3

NVD

Description

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs file (if the user has read-only access to that file, and that file contains holes), related to fs/userfaultfd.c and mm/userfaultfd.c.

CWE-863Incorrect Authorization

How to fix

Remediation Available

linuxDebian

Fixed in:4.19.9-1CVE-2018-18397

linuxUbuntu

Fixed in:4.15.0-46.49USN-3901-1

linux-awsUbuntu

Fixed in:4.15.0-1033.35USN-3901-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1033.35~16.04.1USN-3901-2

linux-azureUbuntu

Fixed in:4.15.0-1040.44~14.04.1USN-3901-2

Fixed in:4.15.0-1040.44USN-3901-2

Fixed in:4.18.0-1013.13~18.04.1USN-3903-2

linux-gcpUbuntu

Fixed in:4.15.0-1028.29~16.04.1USN-3901-2

Fixed in:4.15.0-1028.29USN-3901-1

linux-hweUbuntu

Fixed in:4.15.0-46.49~16.04.1USN-3901-2

Fixed in:4.18.0-16.17~18.04.1USN-3903-2

linux-image-4.15.0-1009-oracleUbuntu

Fixed in:4.15.0-1009.11~16.04.1USN-3901-2

Fixed in:4.15.0-1009.11USN-3901-1

linux-image-4.15.0-1028-gcpUbuntu

Fixed in:4.15.0-1028.29~16.04.1USN-3901-2

Fixed in:4.15.0-1028.29USN-3901-1

linux-image-4.15.0-1030-kvmUbuntu

Fixed in:4.15.0-1030.30USN-3901-1

linux-image-4.15.0-1032-raspi2Ubuntu

Fixed in:4.15.0-1032.34USN-3901-1

linux-image-4.15.0-1033-awsUbuntu

Fixed in:4.15.0-1033.35~16.04.1USN-3901-2

Fixed in:4.15.0-1033.35USN-3901-1

linux-image-4.15.0-1034-oemUbuntu

Fixed in:4.15.0-1034.39USN-3901-1

linux-image-4.15.0-1040-azureUbuntu

Fixed in:4.15.0-1040.44~14.04.1USN-3901-2

Fixed in:4.15.0-1040.44USN-3901-2

linux-image-4.15.0-46-genericUbuntu

Fixed in:4.15.0-46.49~16.04.1USN-3901-2

Fixed in:4.15.0-46.49USN-3901-1

linux-image-4.15.0-46-generic-lpaeUbuntu

Fixed in:4.15.0-46.49~16.04.1USN-3901-2

Fixed in:4.15.0-46.49USN-3901-1

linux-image-4.15.0-46-lowlatencyUbuntu

Fixed in:4.15.0-46.49~16.04.1USN-3901-2

Fixed in:4.15.0-46.49USN-3901-1

linux-image-4.15.0-46-snapdragonUbuntu

Fixed in:4.15.0-46.49USN-3901-1

linux-image-4.18.0-1013-azureUbuntu

Fixed in:4.18.0-1013.13~18.04.1USN-3903-2

linux-image-4.18.0-16-genericUbuntu

Fixed in:4.18.0-16.17~18.04.1USN-3903-2

linux-image-4.18.0-16-generic-lpaeUbuntu

Fixed in:4.18.0-16.17~18.04.1USN-3903-2

linux-image-4.18.0-16-lowlatencyUbuntu

Fixed in:4.18.0-16.17~18.04.1USN-3903-2

linux-image-4.18.0-16-snapdragonUbuntu

Fixed in:4.18.0-16.17~18.04.1USN-3903-2

linux-image-awsUbuntu

Fixed in:4.15.0.1033.32USN-3901-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1033.34USN-3901-2

linux-image-azureUbuntu

Fixed in:4.15.0.1040.27USN-3901-2

Fixed in:4.15.0.1040.44USN-3901-2

Fixed in:4.18.0.1013.12USN-3903-2

linux-image-gcpUbuntu

Fixed in:4.15.0.1028.42USN-3901-2

Fixed in:4.15.0.1028.30USN-3901-1

linux-image-genericUbuntu

Fixed in:4.15.0.46.48USN-3901-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.46.67USN-3901-2

linux-image-generic-hwe-18.04Ubuntu

Fixed in:4.18.0.16.66USN-3903-2

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.46.48USN-3901-1

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

Fixed in:4.15.0.46.67USN-3901-2

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

Fixed in:4.18.0.16.66USN-3903-2

linux-image-gkeUbuntu

Fixed in:4.15.0.1028.42USN-3901-2

Fixed in:4.15.0.1028.30USN-3901-1

linux-image-kvmUbuntu

Fixed in:4.15.0.1030.30USN-3901-1

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.46.48USN-3901-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.46.67USN-3901-2

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:4.18.0.16.66USN-3903-2

linux-image-oemUbuntu

Fixed in:4.15.0.46.67USN-3901-2

Fixed in:4.15.0.1034.39USN-3901-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1009.3USN-3901-2

Fixed in:4.15.0.1009.12USN-3901-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1032.30USN-3901-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.46.48USN-3901-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:4.18.0.16.66USN-3903-2

linux-kvmUbuntu

Fixed in:4.15.0-1030.30USN-3901-1

linux-oemUbuntu

Fixed in:4.15.0-1034.39USN-3901-1

linux-oracleUbuntu

Fixed in:4.15.0-1009.11~16.04.1USN-3901-2

Fixed in:4.15.0-1009.11USN-3901-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1032.34USN-3901-1

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

AvailabilityNone

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

Exploit Intelligence

0.51%probability of exploitation in 30 days

40thpercentile

Low risk: more likely to be exploited than 40% of all known CVEs.

References

Patch4

Exploit1

bugs.chromium.org

Third-Party Advisory9

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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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.