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CVE-2018-12633

6.3 · MEDIUM

An issue was discovered in the Linux kernel through 4.17.2.

Published Jun 22, 2018CWE-362EPSS 0.26%

Overview

CVE-2018-12633 is a medium-severity vulnerability. It was published on June 22, 2018 and has a CVSS 3.0 base score of 6.3 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 6.3, 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 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.

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=bd23a7269834dc7c1f93e83535d16ebc44b75ebaRefbugzilla.kernel.org/show_bug.cgi?id=200131GitHubgithub.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75ebaRefgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75ebaRefbugzilla.kernel.org/show_bug.cgi?id=200131GitHubgithub.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba

How CyberStrike helps

Frequently asked questions

What is CVE-2018-12633?

CVE-2018-12633 is a medium-severity vulnerability. It was published on June 22, 2018 and has a CVSS 3.0 base score of 6.3 (MEDIUM).

How severe is CVE-2018-12633?

This vulnerability has a CVSS 3.0 base score of 6.3, 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-2018-12633?

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-2018-12633?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-12633 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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