The kvm_iommu_map_pages function in virt/kvm/iommu.c in the Linux kernel through...

Vulnerability Description

The kvm_iommu_map_pages function in virt/kvm/iommu.c in the Linux kernel through 3.17.2 miscalculates the number of pages during the handling of a mapping failure, which allows guest OS users to cause a denial of service (host OS page unpinning) or possibly have unspecified other impact by leveraging guest OS privileges. NOTE: this vulnerability exists because of an incorrect fix for CVE-2014-3601.

References

• http://www.securityfocus.com/bid/70749
• http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html
• https://lkml.org/lkml/2014/10/24/460
• http://www.debian.org/security/2014/dsa-3093
• http://secunia.com/advisories/62326
• http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00010.html
• http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00025.html
• http://www.openwall.com/lists/oss-security/2014/10/24/7
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3d32e4dbe71374a6780eaf51d719d76f9a9bf22f
• https://bugzilla.redhat.com/show_bug.cgi?id=1156518
• http://secunia.com/advisories/62336
• http://www.securityfocus.com/bid/70747
• https://github.com/torvalds/linux/commit/3d32e4dbe71374a6780eaf51d719d76f9a9bf22f
• http://rhn.redhat.com/errata/RHSA-2015-0674.html