In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp

l2cap_ecred_reconf_rsp() calls l2cap_chan_del() without holding
l2cap_chan_lock(). Every other l2cap_chan_del() caller in the file
acquires the lock first. A remote BLE device can send a crafted
L2CAP ECRED reconfiguration response to corrupt the channel list
while another thread is iterating it.

Add l2cap_chan_hold() and l2cap_chan_lock() before l2cap_chan_del(),
and l2cap_chan_unlock() and l2cap_chan_put() after, matching the
pattern used in l2cap_ecred_conn_rsp() and l2cap_conn_del().

https://git.kernel.org/stable/c/0ccd75c51f620374086f359e906917676e699a1c

https://git.kernel.org/stable/c/330b20ec97916961ee0e6c29c06bc0fa7c96e64c

https://git.kernel.org/stable/c/42776497cdbc9a665b384a6dcb85f0d4bd927eab

https://git.kernel.org/stable/c/5501d055a1ce3c747141e3955ba8cf034d193f3e

https://git.kernel.org/stable/c/77a853aec710b2fdf41fa298ea3cbc9a4358f917

https://git.kernel.org/stable/c/96dca51715d86559ed6ed8028e5445cecb80f3ae

https://git.kernel.org/stable/c/dc89961b76f12aff47124c1df4bdb32a080f4d0c

https://git.kernel.org/stable/c/fe1188abdae9b7a8199dcdfcf9244d5e5d61eb14

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