CVEvulnerability

CVE-2018-12633

6.3 MEDIUM Published 2018-06-22 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2018-06-22
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.0 ([email protected])
6.3 MEDIUM — CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
CVSS 2.0 ([email protected])
6.3 MEDIUM — AV:L/AC:M/Au:N/C:C/I:N/A:C
Weaknesses
CWE-362

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.

Affected configurations

• linux linux kernel (<= 4.17.2)

Related

Weakness · CWE (1)

  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization weakness

References