Xen 4.2.x and 4.3.x, when using Intel VT-d and a PCI device has been assigned, does not clear the flag that suppresses IOMMU TLB flushes when unspecified errors occur, which causes the TLB entries to not be flushed and allows local guest administrators to cause a denial of service (host crash) or gain privileges via unspecified vectors.
CVSS Severity (version 2.0):
Impact Subscore: 10.0
Exploitability Subscore: 3.2
CVSS Version 2 Metrics:
Access Vector: Local network exploitable
Access Complexity: High
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
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[oss-security] 20131210 Xen Security Advisory 80 (CVE-2013-6400) - IOMMU TLB flushing may be inadvertently suppressed
[Xen-announce] 20131210 Xen Security Advisory 80 (CVE-2013-6400) - IOMMU TLB flushing may be inadvertently suppressed