In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready<\/p>\n
iso_conn_ready() looks up the BIS listener socket with iso_get_sock(),
\nwhich takes a reference, and then, without re-checking its state,
\ncreates a child socket from it:<\/p>\n
parent = iso_get_sock(hdev, …);
\n if (!parent)
\n return;<\/p>\n
lock_sock(parent);
\n sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, …);
\n …
\n iso_chan_add(conn, sk, parent);
\n …
\n release_sock(parent);
\n sock_put(parent);<\/p>\n
If the listener socket is closed concurrently, between iso_get_sock()
\nand lock_sock(), the reference taken by iso_get_sock() may be the last
\none: the close path drops the link-list reference, and once
\niso_conn_ready() drops its own reference at the end of the function the
\nsocket is freed. The child socket, however, is already linked to the
\nfreed parent, and a later disconnect of the child runs iso_chan_del()
\n-> bt_accept_unlink(), which dereferences the dangling parent pointer
\ninto the freed accept queue (a use-after-free). The same dangling
\npointer is also dereferenced through parent->***() in
\niso_chan_del().<\/p>\n
Fix it the same way the connected (non-BIS) path was fixed in commit
\n0d255e63fcf3 (“Bluetooth: ISO: hold sk properly in iso_conn_ready”):
\nafter taking the socket lock, re-check that the parent is still a
\nlistening, alive socket, and bail out otherwise.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready<\/p>\n
iso_conn_ready() looks up the BIS listener socket with iso<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-20397","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/20397","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=20397"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20397"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}