Multiple vulnerabilities have been reported in Xen, which can be exploited by malicious, local users in a guest virtual machine to cause a DoS (Denial of Service) and potentially gain escalated privileges.
1) An error when downgrading a grant table version of a guest can be exploited to cause a hypervisor crash.
2) An error when handling certain HVM control operations can be exploited to consume physical CPU resources.
3) An array-indexing error in the "HVMOP_set_mem_access" operation handler can be exploited to cause a crash.
4) An error in the "XENMEM_exchange" handler may result in guest provided addresses to be included in the hypervisor's reserved range.
5) An error in the "guest_physmap_mark_populate_on_demand()" function when checking subject GFNs can be exploited to cause a hang.
6) An error when handling "extent_order" values for "XENMEM_decrease_reservation", "XENMEM_populate_physmap", and "XENMEM_exchange" can be exploited to cause a hang.
7) An error in the "get_page_from_gfn()" function when handling an input GFN can be exploited to reference memory outside of the frame table.
Please see the vendor's advisory for a list of affected versions.
Solution: Apply patches (please see the vendor's advisory for details).
Provided and/or discovered by: Reported by the vendor.
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Subject: Xen Multiple Vulnerabilities
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