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CVE-2015-7837

5.5 · MEDIUM

The Linux kernel, as used in Red Hat Enterprise Linux 7, kernel-rt, and Enterprise MRG 2 and when booted with UEFI Secure Boot enabled, allows local users to bypass intended securelevel/secureboot…

Published Sep 19, 2017CWE-254EPSS 0.40%

Overview

CVE-2015-7837 is a medium-severity vulnerability. It was published on September 19, 2017 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

The Linux kernel, as used in Red Hat Enterprise Linux 7, kernel-rt, and Enterprise MRG 2 and when booted with UEFI Secure Boot enabled, allows local users to bypass intended securelevel/secureboot restrictions by leveraging improper handling of secure_boot flag across kexec reboot.

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

Refrhn.redhat.com/errata/RHSA-2015-2152.htmlRefrhn.redhat.com/errata/RHSA-2015-2411.htmlRefwww.openwall.com/lists/oss-security/2015/10/15/6Refwww.securityfocus.com/bid/77097Refbugzilla.redhat.com/show_bug.cgi?id=1272472GitHubgithub.com/mjg59/linux/commit/4b2b64d5a6ebc84214755ebccd599baef7c1b798Refrhn.redhat.com/errata/RHSA-2015-2152.htmlRefrhn.redhat.com/errata/RHSA-2015-2411.htmlRefwww.openwall.com/lists/oss-security/2015/10/15/6Refwww.securityfocus.com/bid/77097

How CyberStrike helps

Frequently asked questions

What is CVE-2015-7837?

CVE-2015-7837 is a medium-severity vulnerability. It was published on September 19, 2017 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

How severe is CVE-2015-7837?

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-2015-7837?

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-2015-7837?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-7837 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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