{"id":14895,"date":"2026-09-04T19:02:17","date_gmt":"2026-09-04T11:02:17","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-63823"},"modified":"2026-09-04T19:02:17","modified_gmt":"2026-09-04T11:02:17","slug":"cve-2026-63823","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-63823","title":{"rendered":"CVE-2026-63823 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Pin request_key"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>keys: Pin request_key_auth payload in instantiate paths<\/p>\n<p>A: request_key()       B: KEYCTL_INSTANTIATE_IOV<br \/>\n================       =========================<\/p>\n<p>create auth key<br \/>\nstore rka in auth key<br \/>\nwait for helper<br \/>\n                       get auth key<br \/>\n                       load rka from auth key<br \/>\n                       copy user payload<br \/>\n                       sleep on #PF<\/p>\n<p>helper completed<br \/>\ndetach and free rka<br \/>\ndestroy auth key<br \/>\n                       wake up<br \/>\n                       use rka-&gt;target_key<br \/>\n                       **USE-AFTER-FREE**<\/p>\n<p>Give request_key_auth payloads a refcount.  Take a payload reference while<br \/>\nauthkey-&gt;sem stabilizes the payload and revocation state.  Hold that<br \/>\nreference across the instantiate and reject paths.  Drop the auth key<br \/>\nowning reference from revoke and destroy.<\/p>\n<p>[jarkko: Replaced the first two paragraphs of text with an actual<br \/>\n concurrency scenario.]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>keys: Pin request_key_auth payload in instantiate paths<\/p>\n<p>A: request_key()       B: KEYCTL_INSTANTIATE_IOV<br \/>\n================       ==<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14895","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14895","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=14895"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14895"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14895"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}