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CVE-2018-12896

5.5 · MEDIUM

An issue was discovered in the Linux kernel through 4.17.3.

Published Jul 2, 2018CWE-190EPSS 0.64%

Overview

CVE-2018-12896 is a medium-severity vulnerability. It was published on July 2, 2018 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

An issue was discovered in the Linux kernel through 4.17.3. An Integer Overflow in kernel/time/posix-timers.c in the POSIX timer code is caused by the way the overrun accounting works. Depending on interval and expiry time values, the overrun can be larger than INT_MAX, but the accounting is int based. This basically makes the accounting values, which are visible to user space via timer_getoverrun(2) and siginfo::si_overrun, random. For example, a local user can cause a denial of service (signed integer overflow) via crafted mmap, futex, timer_create, and timer_settime system calls.

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

Refbugzilla.kernel.org/show_bug.cgi?id=200189GitHubgithub.com/lcytxw/bug_repro/tree/master/bug_200189GitHubgithub.com/torvalds/linux/commit/78c9c4dfbf8c04883941445a195276bb4bb92c76Reflists.debian.org/debian-lts-announce/2019/03/msg00017.htmlReflists.debian.org/debian-lts-announce/2019/03/msg00034.htmlReflists.debian.org/debian-lts-announce/2019/04/msg00004.htmlRefusn.ubuntu.com/3847-1/Refusn.ubuntu.com/3847-2/Refusn.ubuntu.com/3847-3/Refusn.ubuntu.com/3848-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2018-12896?

CVE-2018-12896 is a medium-severity vulnerability. It was published on July 2, 2018 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

How severe is CVE-2018-12896?

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-2018-12896?

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-2018-12896?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-12896 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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