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CVE-2019-19039

5.5 · MEDIUM

__btrfs_free_extent in fs/btrfs/extent-tree.c in the Linux kernel through 5.3.12 calls btrfs_print_leaf in a certain ENOENT case, which allows local users to obtain potentially sensitive informatio…

Published Nov 21, 2019CWE-532EPSS 0.70%

Overview

CVE-2019-19039 is a medium-severity vulnerability. It was published on November 21, 2019 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

__btrfs_free_extent in fs/btrfs/extent-tree.c in the Linux kernel through 5.3.12 calls btrfs_print_leaf in a certain ENOENT case, which allows local users to obtain potentially sensitive information about register values via the dmesg program. NOTE: The BTRFS development team disputes this issues as not being a vulnerability because “1) The kernel provide facilities to restrict access to dmesg - dmesg_restrict=1 sysctl option. So it's really up to the system administrator to judge whether dmesg access shall be disallowed or not. 2) WARN/WARN_ON are widely used macros in the linux kernel. If this CVE is considered valid this would mean there are literally thousands CVE lurking in the kernel - something which clearly is not the case.

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

GitHubgithub.com/bobfuzzer/CVE/tree/master/CVE-2019-19039Reflists.debian.org/debian-lts-announce/2020/12/msg00015.htmlRefusn.ubuntu.com/4414-1/GitHubgithub.com/bobfuzzer/CVE/tree/master/CVE-2019-19039Reflists.debian.org/debian-lts-announce/2020/12/msg00015.htmlRefusn.ubuntu.com/4414-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-19039?

CVE-2019-19039 is a medium-severity vulnerability. It was published on November 21, 2019 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2019-19039?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-19039?

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-2019-19039?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-19039 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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