Date: Fri, 25 Feb 2011 21:17:30 -0500 From: Nelson Elhage <nelhage@...lice.com> To: oss-security@...ts.openwall.com Subject: CVE request: v86d: Failure to validate netlink message sender Versions of the v86d userspace helper for the Linux uvesafb driver before 0.1.10 did not verify that received netlink messages were sent by the kernel, allowing unprivileged users to manipulate the video mode and potentially other consequences. v86d executes video BIOS code with access to /dev/mem in response to netlink messages, using either vm86 mode or an x86 emulator, depending on configuration. I an unclear on whether it is possible to e.g. crash the machine or escalate privileges by spoofing requests, or only to mess with the video card. References: http://repo.or.cz/w/v86d.git/commit/f9abfd412639286c3143e93e8ba2c9598dfba640
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