CVE-2026-53071

Description

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().

References

• 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