{"id":24734,"date":"2026-09-16T20:32:42","date_gmt":"2026-09-16T12:32:42","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-90046"},"modified":"2026-09-16T20:32:42","modified_gmt":"2026-09-16T12:32:42","slug":"cve-2026-90046","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-90046","title":{"rendered":"CVE-2026-90046 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nmm\/page_alloc: don&#8217;t"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>mm\/page_alloc: don&#8217;t spin_trylock() in NMI on UP<\/p>\n<p>Patch series &#8220;mm\/page_alloc: fixes for free_pages_nolock() on RT\/UP&#8221;.<\/p>\n<p>Pre-existing bugs found by Sashiko during review of this other series:<br \/>\nhttps:\/\/lore.kernel.org\/all\/20260703-alloc-trylock-v5-0-c87b714e19d3@google.com\/<\/p>\n<p>I have not reproduced these bugs, and I suspect there is no real-world<br \/>\nuser that is affected by them.<\/p>\n<p>This patch (of 2):<\/p>\n<p>As noted in can_spin_trylock(), using this is unsafe in this context.<br \/>\ncommit 620b46ed6ae17 (&#8220;mm\/page_alloc: return NULL early from<br \/>\nalloc_frozen_pages_nolock() in NMI on UP&#8221;) fixed this on the alloc side<br \/>\nbut missed the free side.<\/p>\n<p>Impact: If BPF programs using these features in NMI (probably tracing) are<br \/>\npresent on non-SMP builds this might crash the kernel and is probably<br \/>\nexploitable by local attackers for privilege escalation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>mm\/page_alloc: don&#8217;t spin_trylock() in NMI on UP<\/p>\n<p>Patch series &#8220;mm\/page_alloc: fixes for free_pages_nolock() on RT\/UP&#8221;.<\/p>\n<p>Pre-existi<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24734","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24734","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=24734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}