VOMIT (go/vomit) has received an external vulnerability report for the Linux kernel.
Advisory: CVE-2018-12633
Details: http://vomit.googleplex.com/advisory?id=CVE/CVE-2018-12633
CVSS severity score: 6.3/10.0
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.
This bug was filed by http://go/vomit
Please contact us at vomit-team@google.com if you need any assistance.
Comment 1 by zsm@chromium.org
, Aug 23Labels: Security_Severity-High Security_Impact-Head Pri-3
Owner: zsm@chromium.org
Status: WontFix (was: Untriaged)
Upstream commit is bd23a7269834d("virt: vbox: Only copy_from_user the request-header once") CONFIG_VBOXGUEST is not set in any of our kernels. Marking as Wontfix.