{"id":28610,"date":"2026-09-25T04:31:28","date_gmt":"2026-09-24T20:31:28","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-93795"},"modified":"2026-09-25T04:31:28","modified_gmt":"2026-09-24T20:31:28","slug":"cve-2026-93795","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-93795","title":{"rendered":"CVE-2026-93795 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix leaks"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>blk-cgroup: fix leaks and online flag on radix_tree_insert failure<\/p>\n<p>When radix_tree_insert() fails in blkg_create(), the error path has two<br \/>\nissues:<\/p>\n<p>1. blkg-&gt;online is set to true unconditionally, even when the blkg was<br \/>\n   never fully inserted.  Move the assignment inside the success block.<\/p>\n<p>2. The error path calls blkg_put() without first calling<br \/>\n   percpu_ref_kill().  Because the refcount is still in percpu mode,<br \/>\n   percpu_ref_put() only does this_cpu_sub() without checking for zero,<br \/>\n   so blkg_release() is never triggered.  This permanently leaks the<br \/>\n   blkg memory, its percpu iostat, policy data, the parent blkg<br \/>\n   reference, and the cgroup css reference \u2014 the latter preventing the<br \/>\n   cgroup from ever being destroyed.<\/p>\n<p>Fix by replacing blkg_put() with percpu_ref_kill(), matching the pattern<br \/>\nused in blkg_destroy().<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>blk-cgroup: fix leaks and online flag on radix_tree_insert failure<\/p>\n<p>When radix_tree_insert() fails in blkg_create(), the error path<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28610","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28610","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=28610"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28610"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28610"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}