{"id":15020,"date":"2026-09-04T19:02:22","date_gmt":"2026-09-04T11:02:22","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-64027"},"modified":"2026-09-04T19:02:22","modified_gmt":"2026-09-04T11:02:22","slug":"cve-2026-64027","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-64027","title":{"rendered":"CVE-2026-64027 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nnet: shaper: rework t"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>net: shaper: rework the VALID marking (again)<\/p>\n<p>Recent commit changed the semantics from NOT_VALID to VALID.<br \/>\nI didn&#8217;t realize that the flags are not stored atomically<br \/>\nwith the entry in XArray. There&#8217;s still a race of reader<br \/>\nobserving a VALID mark for a slot, getting interrupted,<br \/>\nwriter replacing the entry with a different one, reader<br \/>\ncontinuing, fetching the entry which is now a different<br \/>\npointer than the pointer for which VALID was meant.<\/p>\n<p>The biggest consequence of this is that we may see a UAF<br \/>\nsince net_shaper_rollback() assumed that entries without<br \/>\nVALID can be freed without observing RCU.<\/p>\n<p>Looks like the XArray marks are buying us nothing at this<br \/>\npoint. Let&#8217;s convert the code to an explicit valid field.<br \/>\nThe smp_load_acquire() \/ smp_store_release() barriers are<br \/>\nmarginally cleaner.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>net: shaper: rework the VALID marking (again)<\/p>\n<p>Recent commit changed the semantics from NOT_VALID to VALID.<br \/>\nI didn&#8217;t realize that t<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15020","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15020","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=15020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}