CVE-2018-12633

 

Published at: - 22-06-2018 02:29

Last modified: - 26-10-2022 01:44

Total changes: - 3

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.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba
• https://bugzilla.kernel.org/show_bug.cgi?id=200131
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75eba

 

Keywords

NVD

 

CVE-2018-12633

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures