{"id":36986,"date":"2026-10-14T00:32:33","date_gmt":"2026-10-13T16:32:33","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-79609"},"modified":"2026-10-14T00:32:33","modified_gmt":"2026-10-13T16:32:33","slug":"cve-2026-79609","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-79609","title":{"rendered":"CVE-2026-79609 &#8211; XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown\n(CVE-2017-5754, one as"},"content":{"rendered":"<p>XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown<br \/>\n(CVE-2017-5754, one aspect of XSA-254).  This involves copying 64-bit PV<br \/>\nguest page table entries from guest-chosen root page tables to the Xen-<br \/>\nchosen one which is in actual use by hardware.  To read the guest root<br \/>\npage table, the directmap is used.  PV guests, however, have a directmap<br \/>\nwhich may not cover all memory; in particular this is the case if any<br \/>\nmemory extends beyond the 5 TiB (CONFIG_BIGMEM=y: 3.5 TiB) address<br \/>\nboundary.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown<br \/>\n(CVE-2017-5754, one aspect of XSA-254).  This involves copying 64-bit PV<br \/>\nguest page table entries from guest-chosen root page tables<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-36986","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/36986","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=36986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}