CVE-2026-23395

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

Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ

Currently the code attempts to accept requests regardless of the

command identifier which may cause multiple requests to be marked

as pending (FLAG_DEFER_SETUP) which can cause more than

L2CAP_ECRED_MAX_CID(5) to be allocated in l2cap_ecred_rsp_defer

causing an overflow.

The spec is quite clear that the same identifier shall not be used on

subsequent requests:

'Within each signaling channel a different Identifier shall be used

for each successive request or indication.'

https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/host/logical-link-control-and-adaptation-protocol-specification.html#UUID-32a25a06-4aa4-c6c7-77c5-dcfe3682355d

So this attempts to check if there are any channels pending with the

same identifier and rejects if any are found.