Linux vulnerability

What happened

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().

Affected versions

Linux: 15f02b91056253e8cdc592888f431da0731337b8 through before 96dca51715d86559ed6ed8028e5445cecb80f3ae (git); 15f02b91056253e8cdc592888f431da0731337b8 through before 330b20ec97916961ee0e6c29c06bc0fa7c96e64c (git); 15f02b91056253e8cdc592888f431da0731337b8 through before 0ccd75c51f620374086f359e906917676e699a1c (git); 15f02b91056253e8cdc592888f431da0731337b8 through before 77a853aec710b2fdf41fa298ea3cbc9a4358f917 (git); 15f02b91056253e8cdc592888f431da0731337b8 through before fe1188abdae9b7a8199dcdfcf9244d5e5d61eb14 (git); 15f02b91056253e8cdc592888f431da0731337b8 through before dc89961b76f12aff47124c1df4bdb32a080f4d0c (git); 15f02b91056253e8cdc592888f431da0731337b8 through before 5501d055a1ce3c747141e3955ba8cf034d193f3e (git); 15f02b91056253e8cdc592888f431da0731337b8 through before 42776497cdbc9a665b384a6dcb85f0d4bd927eab (git); 5.7 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.