{"id":7492,"date":"2026-09-04T18:49:34","date_gmt":"2026-09-04T10:49:34","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74496"},"modified":"2026-09-04T18:49:34","modified_gmt":"2026-09-04T10:49:34","slug":"cve-2026-74496","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74496","title":{"rendered":"CVE-2026-74496 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nfou: Fix use-after-fr"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>fou: Fix use-after-free in fou_create()<\/p>\n<p>fou_create() publishes struct fou through sk_user_data before adding the<br \/>\nnew FOU port to the per-netns list.  If fou_add_to_port_list() fails,<br \/>\nthe error path frees fou while it is still reachable through<br \/>\nsk_user_data.  A concurrent receive can then dereference the freed<br \/>\nobject in fou_from_sock().<\/p>\n<p>This ordering issue was previously noted in the linked discussion.<\/p>\n<p>The failure is reachable when local port 0 is requested.  Each socket<br \/>\nbinds to a different ephemeral port, but fou_cfg_cmp() compares the<br \/>\nrequested port 0 and reports -EALREADY once an entry already exists.<\/p>\n<p>Release the tunnel socket before freeing fou so sk_user_data is cleared<br \/>\nfirst, and defer reclamation with kfree_rcu() to protect concurrent RCU<br \/>\nreaders.  This matches the lifetime handling in fou_release().<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>fou: Fix use-after-free in fou_create()<\/p>\n<p>fou_create() publishes struct fou through sk_user_data before adding the<br \/>\nnew FOU port to t<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7492","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7492","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=7492"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7492"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7492"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}