The kvm_iommu_map_pages function in virt/kvm/iommu.c in the Linux kernel through 3.16.1 miscalculates the number of pages during the handling of a mapping failure, which allows guest OS users to (1) cause a denial of service (host OS memory corruption) or possibly have unspecified other impact by triggering a large gfn value or (2) cause a denial of service (host OS memory consumption) by triggering a small gfn value that leads to permanently pinned pages.

References

• https://nvd.nist.gov/vuln/detail/CVE-2014-3601
• torvalds/linux@350b8bd
• https://bugzilla.redhat.com/show_bug.cgi?id=1131951
• https://exchange.xforce.ibmcloud.com/vulnerabilities/95689
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=350b8bdd689cd2ab2c67c8a86a0be86cfa0751a7
• http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00010.html
• http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00025.html
• http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html
• http://secunia.com/advisories/60830
• http://www.securityfocus.com/bid/69489
• http://www.ubuntu.com/usn/USN-2356-1
• http://www.ubuntu.com/usn/USN-2357-1
• http://www.ubuntu.com/usn/USN-2358-1
• http://www.ubuntu.com/usn/USN-2359-1
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=350b8bdd689cd2ab2c67c8a86a0be86cfa0751a7