CVE-2019-18198

Name: CVE-2019-18198
Creator: NVD / NIST
Published: 2019-10-18T22:15:14.767+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.46%

Last modified Jun 17, 2026

CVE-2019-18198 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

Description

In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.46%

36.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-772

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 5.3, < 5.3.4
Canonical	Ubuntu Linux	19.10

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.4Release Notes, Vendor Advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca7a03c4175366a92cee0ccc4fec0038c3266e26Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/ca7a03c4175366a92cee0ccc4fec0038c3266e26Patch, Third Party Advisory
https://launchpad.net/bugs/1847478Exploit, Issue Tracking, Third Party Advisory
https://security.netapp.com/advisory/ntap-20191031-0005/Third Party Advisory
https://usn.ubuntu.com/4161-1/Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.4Release Notes, Vendor Advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca7a03c4175366a92cee0ccc4fec0038c3266e26Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/ca7a03c4175366a92cee0ccc4fec0038c3266e26Patch, Third Party Advisory
https://launchpad.net/bugs/1847478Exploit, Issue Tracking, Third Party Advisory
https://security.netapp.com/advisory/ntap-20191031-0005/Third Party Advisory
https://usn.ubuntu.com/4161-1/Third Party Advisory

Timeline

Published: Oct 18, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18198?

How severe is CVE-2019-18198?

CVE-2019-18198 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18198?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-18198?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST