In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
wifi: cfg80211: use wiphy work for socket owner autodisconnect<\/p>\n
nl80211_netlink_notify() walks the cfg80211 wireless device list when a
\nNETLINK_GENERIC socket is released. If the socket owns a connection, the
\nnotifier queues the embedded wdev->disconnect_wk work item.<\/p>\n
That work is a plain work_struct today. NETDEV_GOING_DOWN cancels it, but a
\nNETLINK_URELEASE notifier that already observed conn_owner_nlportid can
\nqueue it after that cancel returns. _cfg80211_unregister_wdev() then
\nremoves the wdev from the list and waits for RCU readers, but
\nsynchronize_net() does not drain work queued by such a reader.<\/p>\n
Make the autodisconnect work a wiphy_work instead. The callback already
\nneeds the wiphy mutex, and wiphy_work runs under that mutex. This lets
\nteardown cancel pending autodisconnect work while holding the mutex,
\nwithout a cancel_work_sync() vs. worker locking concern.<\/p>\n
Also cancel the wiphy work after list_del_rcu() and synchronize_net(). Any
\nNETLINK_URELEASE notifier that had already reached the wdev list has then
\neither queued the work and it is removed, or can no longer find the wdev.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
wifi: cfg80211: use wiphy work for socket owner autodisconnect<\/p>\n
nl80211_netlink_notify() walks the cfg80211 wireless device list wh<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-5465","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/5465","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=5465"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5465"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}