{"id":28480,"date":"2026-09-25T00:31:32","date_gmt":"2026-09-24T16:31:32","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-93216"},"modified":"2026-09-25T00:31:32","modified_gmt":"2026-09-24T16:31:32","slug":"cve-2026-93216","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-93216","title":{"rendered":"CVE-2026-93216 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nmm\/page_owner: use me"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>mm\/page_owner: use memcg_data snapshot to avoid TOCTOU in print_page_owner_memcg()<\/p>\n<p>print_page_owner_memcg() reads page-&gt;memcg_data via READ_ONCE() at the<br \/>\nstart to guard against tail pages and NULL data.  However, it later<br \/>\nre-reads page-&gt;memcg_data locklessly in two places:<\/p>\n<p>1: page_memcg_check(page)<\/p>\n<p>2: PageMemcgKmem(page) (via folio_memcg_kmem(), which includes<br \/>\n   VM_BUG_ON assertions for tail pages and MEMCG_DATA_OBJEXTS)<\/p>\n<p>If the page is concurrently freed and reallocated as a THP tail page or<br \/>\nslab page between these calls, the VM_BUG_ON assertions can trigger on<br \/>\nCONFIG_DEBUG_VM=y builds, crashing the kernel.<\/p>\n<p>Fix both TOCTOU issues by using the memcg_data snapshot throughout.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>mm\/page_owner: use memcg_data snapshot to avoid TOCTOU in print_page_owner_memcg()<\/p>\n<p>print_page_owner_memcg() reads page-&gt;memcg_data<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28480","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28480","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=28480"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28480"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28480"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}