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CVE-2018-12633

MediumPublished

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...

Published: Jun 22, 2018
Updated: Aug 5, 2024
Assigning CNA: mitre
Evidence observed: Aug 10, 2026

Primary CVSS

6.3/ 10Medium

nvd · CVSS 3.0

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 19.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2018-12633-TPLink-Auth-BypassExploit
A technical case study and exploitation analysis of the Authentication Bypass vulnerability in TP-Link TL-WR840N firmware (CVE-2018-12633).

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