Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Thu, 24 Nov 2011 18:49:36 +0100
From: Petr Matousek <>
Subject: CVE request -- kernel: kvm: device assignment DoS

It was found that kvm_vm_ioctl_assign_device function did not check if
the user requesting assignment was privileged or not. Together with
/dev/kvm being 666, unprivileged user could assign unused pci devices,
or even devices that were in use and whose resources were not properly
claimed by the respective drivers.

Please note that privileged access was still needed to re-program the
device to for example issue DMA requests. This is typically achieved by
touching files on sysfs filesystem. These files are usually not
accessible to unprivileged users.

As a result, local user could use this flaw to crash the system.


Petr Matousek / Red Hat Security Response Team

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.