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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2018-06-22T00:00:00

Updated: 2024-08-05T08:38:06.382Z

Reserved: 2018-06-21T00:00:00

Link: CVE-2018-12633

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2018-06-22T00:29:00.270

Modified: 2018-08-21T15:42:37.667

Link: CVE-2018-12633

cve-icon Redhat

Severity : Moderate

Publid Date: 2018-05-08T00:00:00Z

Links: CVE-2018-12633 - Bugzilla