{"id":6857,"date":"2026-09-04T18:49:20","date_gmt":"2026-09-04T10:49:20","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-72239"},"modified":"2026-09-04T18:49:20","modified_gmt":"2026-09-04T10:49:20","slug":"cve-2026-72239","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-72239","title":{"rendered":"CVE-2026-72239 [CRITICAL] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nx86\/virt\/sev: Revert"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>x86\/virt\/sev: Revert &#8220;Drop WBINVD before setting MSR_AMD64_SYSCFG_SNP_EN&#8221;<\/p>\n<p>Revert<\/p>\n<p>  99cf1fb58e68 (&#8220;x86\/virt\/sev: Drop WBINVD before setting MSR_AMD64_SYSCFG_SNP_EN&#8221;).<\/p>\n<p>Section 8.8 of the SNP spec says:<\/p>\n<p>  Before invoking SNP_INIT_EX with INIT_RMP set to 1, software must ensure<br \/>\n  that no CPUs contain dirty cache lines for the memory containing the RMP.<\/p>\n<p>Cachelines can be moved from cache to cache in a dirty state. The<br \/>\nwbinvd_on_all_cpus() before SNP_INIT_EX flushes the caches for each CPU, but<br \/>\nif the IPIs for WBINVD race with this dirty cacheline movement, it is possible<br \/>\nthat they may not get flushed, violating the firmware requirement.<\/p>\n<p>Doing wbinvd_on_all_cpus() before setting SNPEn is safer since the RMP<br \/>\ntable is not yet in use.<\/p>\n<p>  [ Heroically bisected by Srikanth. ]<br \/>\n  [ bp: Massage commit message. ]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>x86\/virt\/sev: Revert &#8220;Drop WBINVD before setting MSR_AMD64_SYSCFG_SNP_EN&#8221;<\/p>\n<p>Revert<\/p>\n<p>  99cf1fb58e68 (&#8220;x86\/virt\/sev: Drop WBINVD befor<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-6857","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/6857","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=6857"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6857"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6857"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}