{"id":29041,"date":"2026-09-25T20:31:44","date_gmt":"2026-09-25T12:31:44","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-97609"},"modified":"2026-09-25T20:31:44","modified_gmt":"2026-09-25T12:31:44","slug":"cve-2026-97609","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-97609","title":{"rendered":"CVE-2026-97609 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: cttimeout:"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>netfilter: cttimeout: prevent UAF during module unload<\/p>\n<p>nf_ct_set_timeout() protects the timeout hook dereference and policy lookup<br \/>\nwith rcu_read_lock(). cttimeout_exit(), however, unregisters the per-net<br \/>\noperations before it clears the hook.<\/p>\n<p>This allows the following interleaving:<\/p>\n<p>  CPU 0                              CPU 1<br \/>\n  cttimeout_exit()                   nf_ct_set_timeout()<br \/>\n    unregister_pernet_subsys()         rcu_read_lock()<br \/>\n      kfree(pernet)                     h = nf_ct_timeout_hook<br \/>\n                                        h-&gt;timeout_find_get()<br \/>\n                                          nfct_timeout_pernet()<\/p>\n<p>The hook still points to ctnl_timeout_find_get() when CPU 1 looks up the<br \/>\nalready freed per-net timeout list. KASAN reported:<\/p>\n<p>  BUG: KASAN: slab-use-after-free in ctnl_timeout_find_get<br \/>\n  Read of size 8 by task poc\/90<br \/>\n  Call Trace:<br \/>\n   ctnl_timeout_find_get+0x271\/0x2a0 [nfnetlink_cttimeout]<br \/>\n   nf_ct_set_timeout+0x7b\/0x3c0<br \/>\n   xt_ct_tg_check+0x724\/0xb20<br \/>\n   xt_check_target+0x234\/0xa90<br \/>\n   do_ipt_set_ctl+0x570\/0x1270<br \/>\n  Allocated by task 89:<br \/>\n   __kmalloc_noprof+0x16e\/0x460<br \/>\n   ops_init+0x6d\/0x420<br \/>\n   register_pernet_operations+0x2f6\/0x670<br \/>\n  Freed by task 91:<br \/>\n   kfree+0x131\/0x390<br \/>\n   ops_undo_list+0x3d4\/0x730<br \/>\n   unregister_pernet_operations+0x232\/0x490<br \/>\n   unregister_pernet_subsys+0x1c\/0x30<br \/>\n   cttimeout_exit+0x52\/0x970 [nfnetlink_cttimeout]<\/p>\n<p>Clear the hook and wait for existing readers before unregistering the<br \/>\nper-net operations. This blocks new policy lookups and ensures readers that<br \/>\nobserved the hook finish before the per-net storage is freed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>netfilter: cttimeout: prevent UAF during module unload<\/p>\n<p>nf_ct_set_timeout() protects the timeout hook dereference and policy lookup<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29041","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29041","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=29041"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29041"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29041"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}