CVE-2018-12633
MEDIUM 6.3EPSS 0.3%
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 NVD
- 6.3 MEDIUM
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H - CVSS v2.0 NVD
- 6.3 MEDIUM
AV:L/AC:M/Au:N/C:C/I:N/A:C - EPSS
- 0.26% chance of exploitation in the next 30 days, 17th percentile
- Published
- 2018-06-22
- Updated
- 2024-08-05
Proof-of-concept exploits (1)
- wiliam227user/CVE-2018-12633-TPLink-Auth-Bypass1★ · 2025-12-31
Security advisories
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7…
- https://bugzilla.kernel.org/show_bug.cgi?id=200131
- torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba