{"id":21408,"date":"2026-09-12T04:31:08","date_gmt":"2026-09-11T20:31:08","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89486"},"modified":"2026-09-12T04:31:08","modified_gmt":"2026-09-11T20:31:08","slug":"cve-2026-89486","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89486","title":{"rendered":"CVE-2026-89486 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nipmi: Fix use-after-f"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()<\/p>\n<p>Commit 9e91f8a6c868 (&#8220;ipmi:msghandler: Remove srcu for the<br \/>\nipmi_interfaces list&#8221;) dropped the synchronize_rcu() between unlinking<br \/>\nthe command receivers from intf-&gt;cmd_rcvrs and freeing them, updating<br \/>\nonly the comment that explains why the barrier is needed.<\/p>\n<p>The cmd_rcvrs list is still traversed under plain RCU: find_cmd_rcvr()<br \/>\nwalks it inside rcu_read_lock(), and handle_ipmb_get_msg_cmd() borrows<br \/>\nrcvr-&gt;user from that lookup within the same read-side section. Without<br \/>\nthe grace period, _ipmi_destroy_user() can kfree() a cmd_rcvr while a<br \/>\nreader still holds a pointer to it, causing a use-after-free.<\/p>\n<p>The rework only made srcu unnecessary for the interfaces list; the<br \/>\ncmd_rcvrs list still relies on plain RCU. Restore the synchronize_rcu()<br \/>\nbefore freeing the receivers.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()<\/p>\n<p>Commit 9e91f8a6c868 (&#8220;ipmi:msghandler: Remove srcu for the<br \/>\nipmi_inter<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21408","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21408","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=21408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}