In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock<\/p>\n
l2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for
\npending_rx_work. process_pending_rx() takes the same mutex, so teardown
\ncan deadlock against the worker it is flushing.<\/p>\n
This issue was found by our static analysis tool and then manually
\nreviewed against the current tree.<\/p>\n
The grounded PoC kept the l2cap_conn_ready() -> queue_work(…,
\n&conn->pending_rx_work) submit path, the l2cap_conn_del() ->
\ncancel_work_sync(&conn->pending_rx_work) teardown path, and the
\nprocess_pending_rx() -> mutex_lock(&conn->lock) worker edge. Lockdep<\/p>\n
WARNING: possible circular locking dependency detected
\n process_pending_rx+0x21\/0x2a [vuln_msv]
\n l2cap_conn_del.constprop.0+0x3f\/0x4e [vuln_msv]
\n *** DEADLOCK ***<\/p>\n
Cancel pending_rx_work before taking conn->lock, matching the existing
\nlock-before-drain ordering used for the two delayed works in the same
\nteardown path. The pending_rx queue is still purged after the work has
\nbeen cancelled and conn->lock has been acquired.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock<\/p>\n
l2cap_conn_del() takes conn->lock and then calls cancel_work_syn<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15190","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15190","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=15190"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15190"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15190"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}