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CVE-2019-18198

7.8 · HIGH

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 fla…

Published Oct 18, 2019CWE-772EPSS 0.47%

Overview

CVE-2019-18198 is a high-severity vulnerability. It was published on October 18, 2019 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.4Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca7a03c4175366a92cee0ccc4fec0038c3266e26GitHubgithub.com/torvalds/linux/commit/ca7a03c4175366a92cee0ccc4fec0038c3266e26Reflaunchpad.net/bugs/1847478Refsecurity.netapp.com/advisory/ntap-20191031-0005/Refusn.ubuntu.com/4161-1/Refcdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.4Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca7a03c4175366a92cee0ccc4fec0038c3266e26GitHubgithub.com/torvalds/linux/commit/ca7a03c4175366a92cee0ccc4fec0038c3266e26Reflaunchpad.net/bugs/1847478

How CyberStrike helps

Frequently asked questions

What is CVE-2019-18198?

CVE-2019-18198 is a high-severity vulnerability. It was published on October 18, 2019 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2019-18198?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-18198?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-18198?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-18198 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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