xen: Multiple vulnerabilities (CVE-2020-11739, CVE-2020-11740, CVE-2020-11741, CVE-2020-11742, CVE-2020-11743)
CVE-2020-11740, CVE-2020-11741, XSA-313: Multiple xenoprof issues
All Xen versions back to at least 3.2 are vulnerable.
CVE-2020-11739, XSA-314: Missing memory barriers in read-write unlock paths
CVE-2020-11742, XSA-318: Bad continuation handling in GNTTABOP_copy
CVE-2020-11743, XSA-316: Bad error path in GNTTABOP_map_grant
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