{"id":41330,"date":"2026-10-19T00:33:15","date_gmt":"2026-10-18T16:33:15","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98858"},"modified":"2026-10-19T00:33:15","modified_gmt":"2026-10-18T16:33:15","slug":"cve-2026-98858","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98858","title":{"rendered":"CVE-2026-98858 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix task_wo"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>io_uring: fix task_work add use-after-free with SQPOLL<\/p>\n<p>For SQPOLL, the sqpoll thread runs task_work off its own list and<br \/>\ndoesn&#8217;t need to be told about it, so it can pop and complete a request<br \/>\nas soon as mpscq_push() has published it. If that was the last request<br \/>\nholding the ring alive, io_ring_exit_work() then frees the ctx, stops<br \/>\nthe thread, and with it the tctx, while io_req_normal_work_add() is<br \/>\nstill looking at both after the push:<\/p>\n<p>  BUG: KASAN: slab-use-after-free in io_req_normal_work_add+0x439\/0x510<br \/>\n  Read of size 4 at addr ff11000000ca0000 by task repro\/55<br \/>\n  (&#8230;)<br \/>\n  BUG: KASAN: slab-use-after-free in queue_work_on+0x25\/0x70<br \/>\n  Write of size 8 at addr ff11000000c3bd00 by task repro\/55<\/p>\n<p>Hold an RCU read lock across the add, like io_req_local_work_add() already<br \/>\ndoes, and have io_ring_exit_work() wait for a grace period for SQPOLL rings<br \/>\nas well before freeing the ctx.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>io_uring: fix task_work add use-after-free with SQPOLL<\/p>\n<p>For SQPOLL, the sqpoll thread runs task_work off its own list and<br \/>\ndoesn&#8217;t n<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41330","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41330","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=41330"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41330"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}