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CVE-2018-7191

5.5 · MEDIUM

In the tun subsystem in the Linux kernel before 4.13.14, dev_get_valid_name is not called before register_netdevice.

Published May 17, 2019CWE-476EPSS 0.65%

Overview

CVE-2018-7191 is a medium-severity vulnerability. It was published on May 17, 2019 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the tun subsystem in the Linux kernel before 4.13.14, dev_get_valid_name is not called before register_netdevice. This allows local users to cause a denial of service (NULL pointer dereference and panic) via an ioctl(TUNSETIFF) call with a dev name containing a / character. This is similar to CVE-2013-4343.

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

Reflists.opensuse.org/opensuse-security-announce/2019-05/msg00071.htmlReflists.opensuse.org/opensuse-security-announce/2019-06/msg00039.htmlReflists.opensuse.org/opensuse-security-announce/2019-06/msg00048.htmlRefwww.securityfocus.com/bid/108380Refbugs.launchpad.net/ubuntu/+source/linux/+bug/1743792Refbugs.launchpad.net/ubuntu/+source/linux/+bug/1748846Refcdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.14Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0ad646c81b2182f7fa67ec0c8c825e0ee165696dRefgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5c25f65fd1e42685f7ccd80e0621829c105785d9GitHubgithub.com/torvalds/linux/commit/0ad646c81b2182f7fa67ec0c8c825e0ee165696d

How CyberStrike helps

Frequently asked questions

What is CVE-2018-7191?

CVE-2018-7191 is a medium-severity vulnerability. It was published on May 17, 2019 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

How severe is CVE-2018-7191?

This vulnerability has a CVSS 3.0 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2018-7191?

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-2018-7191?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-7191 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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