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CVE-2016-9576

7.8 · HIGH

The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before 4.8.14 does not properly restrict the type of iterator, which allows local users to read or write to arbitrary kernel…

Published Dec 28, 2016CWE-416EPSS 0.44%

Overview

CVE-2016-9576 is a high-severity vulnerability. It was published on December 28, 2016 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 blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before 4.8.14 does not properly restrict the type of iterator, which allows local users to read or write to arbitrary kernel memory locations or cause a denial of service (use-after-free) by leveraging access to a /dev/sg device.

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=a0ac402cfcdc904f9772e1762b3fda112dcc56a0Reflists.opensuse.org/opensuse-security-announce/2016-12/msg00040.htmlReflists.opensuse.org/opensuse-security-announce/2016-12/msg00041.htmlReflists.opensuse.org/opensuse-security-announce/2016-12/msg00057.htmlReflists.opensuse.org/opensuse-security-announce/2016-12/msg00062.htmlReflists.opensuse.org/opensuse-security-announce/2016-12/msg00072.htmlReflists.opensuse.org/opensuse-security-announce/2016-12/msg00075.htmlReflists.opensuse.org/opensuse-security-announce/2016-12/msg00081.htmlReflists.opensuse.org/opensuse-security-announce/2016-12/msg00088.htmlReflists.opensuse.org/opensuse-security-announce/2016-12/msg00091.html

How CyberStrike helps

Frequently asked questions

What is CVE-2016-9576?

CVE-2016-9576 is a high-severity vulnerability. It was published on December 28, 2016 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2016-9576?

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-2016-9576?

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-2016-9576?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-9576 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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