CVE-2026-74540

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

Bluetooth: L2CAP: fix UAF in l2capleconnect_rsp

l2capleconnect_rsp() obtains a channel via __l2capgetchanbyident() but neither holds a reference nor uses l2capchanholdunlesszero() before locking and operating on it. A concurrent l2capchandel() triggered by a remote disconnect can free the channel between the lookup and l2capchanlock(), causing a use-after-free.

The BR/EDR counterpart l2capconnectrsp() and the sibling handler l2caplecommandrej() already use l2capchanholdunlesszero() to safely hold a reference, but l2capleconnectrsp() was left unprotected.

Fix by adding l2capchanholdunlesszero() after the ident lookup and l2capchanput() on the exit path, consistent with other L2CAP response handlers.