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CVE-2017-7889

7.8 · HIGH

The mm subsystem in the Linux kernel through 3.2 does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism, which allows local users to read or write to kernel memory locations in the…

Published Apr 17, 2017CWE-732EPSS 0.32%

Overview

CVE-2017-7889 is a high-severity vulnerability. It was published on April 17, 2017 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

The mm subsystem in the Linux kernel through 3.2 does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism, which allows local users to read or write to kernel memory locations in the first megabyte (and bypass slab-allocation access restrictions) via an application that opens the /dev/mem file, related to arch/x86/mm/init.c and drivers/char/mem.c.

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

Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a4866aa812518ed1a37d8ea0c881dc946409de94Refwww.debian.org/security/2017/dsa-3945Refwww.openwall.com/lists/oss-security/2017/04/16/4Refwww.securityfocus.com/bid/97690Refaccess.redhat.com/errata/RHSA-2017:1842Refaccess.redhat.com/errata/RHSA-2017:2077Refaccess.redhat.com/errata/RHSA-2017:2669Refaccess.redhat.com/errata/RHSA-2018:1854Refgit.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=b8f254aa17f720053054c4ecff3920973a83b9d6GitHubgithub.com/torvalds/linux/commit/a4866aa812518ed1a37d8ea0c881dc946409de94

How CyberStrike helps

Frequently asked questions

What is CVE-2017-7889?

CVE-2017-7889 is a high-severity vulnerability. It was published on April 17, 2017 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2017-7889?

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-2017-7889?

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-2017-7889?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-7889 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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