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CVE-2016-9644

7.8 · HIGH

The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28 contains extended asm statements that are incompatible with the exception table, which allows…

Published Nov 28, 2016CWE-264EPSS 1.45%

Overview

CVE-2016-9644 is a high-severity vulnerability. It was published on November 28, 2016 and has a CVSS 3.0 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28 contains extended asm statements that are incompatible with the exception table, which allows local users to obtain root access on non-SMEP platforms via a crafted application. NOTE: this vulnerability exists because of incorrect backporting of the CVE-2016-9178 patch to older kernels.

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

Refwww.openwall.com/lists/oss-security/2016/11/07/4Refwww.securityfocus.com/bid/94545Refwww.ubuntu.com/usn/USN-3146-1Refwww.ubuntu.com/usn/USN-3146-2Reflwn.net/Articles/705220/Refwww.openwall.com/lists/oss-security/2016/11/07/4Refwww.securityfocus.com/bid/94545Refwww.ubuntu.com/usn/USN-3146-1Refwww.ubuntu.com/usn/USN-3146-2Reflwn.net/Articles/705220/

How CyberStrike helps

Frequently asked questions

What is CVE-2016-9644?

CVE-2016-9644 is a high-severity vulnerability. It was published on November 28, 2016 and has a CVSS 3.0 base score of 7.8 (HIGH).

How severe is CVE-2016-9644?

This vulnerability has a CVSS 3.0 base score of 7.8, rated HIGH. 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-2016-9644?

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-2016-9644?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-9644 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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