Bug 1448438 (CVE-2017-7995)

Summary: CVE-2017-7995 xen: Checks access permissions to MMIO ranges only after accessing them
Product: [Other] Security Response Reporter: Andrej Nemec <anemec>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: ailan, drjones, imammedo, knoel, m.a.young, mrezanin, pbonzini, rkrcmar, robinlee.sysu, virt-maint, vkuznets, xen-maint
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2017-05-05 12:21:34 UTC Type: ---
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Description Andrej Nemec 2017-05-05 12:20:54 UTC 
Xen PV guest before Xen 4.3 checked access permissions to MMIO ranges
only after accessing them, allowing host PCI device space memory reads,
leading to information disclosure. This is an error in the get_user
function. NOTE: the upstream Xen Project considers versions before
4.5.x to be EOL.

References:

https://bugzilla.suse.com/show_bug.cgi?id=1033948