CVE-2018-12633

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.

CVSS v3.0

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

CVSS v2.0

6.3 MEDIUMAV:L/AC:M/Au:N/C:C/I:N/A:C

EPSS

0.26% chance of exploitation in the next 30 days, 18th percentile

Published

2018-06-22

Updated

2024-08-05

Proof-of-concept exploits (1)

• wiliam227user/CVE-2018-12633-TPLink-Auth-Bypass

References

• CVE Record
• NVD entry

Related

• CVE-2018-12632
• CVE-2018-12634
• CVE-2018-12631
• CVE-2018-12636
• CVE-2018-12630
• CVE-2018-12638