{"id":"UBUNTU-CVE-2018-12633","details":"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.","modified":"2026-09-09T14:31:19.594559811Z","published":"2018-06-22T00:29:00Z","upstream":["CVE-2018-12633"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-12633"},{"type":"REPORT","url":"http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75eba"},{"type":"REPORT","url":"https://bugzilla.kernel.org/show_bug.cgi?id=200131"},{"type":"REPORT","url":"https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-12633"}],"affected":[{"package":{"name":"virtualbox","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/virtualbox?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.4-dfsg-2","5.0.8-dfsg-1","5.0.10-dfsg-1","5.0.10-dfsg-2","5.0.10-dfsg-3","5.0.10-dfsg-4","5.0.10-dfsg-5","5.0.10-dfsg-6","5.0.10-dfsg-7","5.0.12-dfsg-1","5.0.12-dfsg-2","5.0.14-dfsg-1","5.0.14-dfsg-2","5.0.14-dfsg-2build1","5.0.16-dfsg-2","5.0.16-dfsg-3","5.0.18-dfsg-1","5.0.18-dfsg-1ubuntu1","5.0.18-dfsg-2","5.0.18-dfsg-2build1","5.0.18-dfsg-2ubuntu1","5.0.24-dfsg-0ubuntu1.16.04.1","5.0.32-dfsg-0ubuntu1.16.04.2","5.0.36-dfsg-0ubuntu1.16.04.2","5.0.40-dfsg-0ubuntu1.16.04.1","5.0.40-dfsg-0ubuntu1.16.04.2","5.1.34-dfsg-0ubuntu1.16.04.2","5.1.38-dfsg-0ubuntu1.16.04.1","5.1.38-dfsg-0ubuntu1.16.04.2","5.1.38-dfsg-0ubuntu1.16.04.3"],"ecosystem_specific":{"priority_reason":"See 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