A weakness has been reported in Xen, which can be exploited by malicious, local users in a guest virtual machine to cause a DoS (Denial of Service).
The weakness is caused due to Xen not properly restricting bogus DMA requests to PCI/PCIE devices under direct control by the virtual machine, which can be exploited to cause IOMMU faults and a high CPU load or deadlock.
The weakness is reported in version 4.1.1. Other versions may also be affected.
Solution: Fixed in the Mercurial repository.
Provided and/or discovered by: Reported by the vendor.
Original Advisory: http://lists.xensource.com/archives/html/xen-devel/2011-06/msg01106.html
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Subject: Xen DMA Requests IOMMU Denial of Service Weakness
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