CVE-2026-63976

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success l2cap_ecred_reconf_rsp() returns early on success without clearing chan->ident. Every other L2CAP response handler (l2cap_ecred_conn_rsp, l2cap_le_connect_rsp, l2cap_config_rsp) clears chan->ident after a successful transaction to prevent the channel from matching subsequent responses with the recycled ident value. A remote attacker that completed a reconfiguration as the peer can replay a failure response with the stale ident, causing the kernel to match and destroy the already-established channel via l2cap_chan_del(chan, ECONNRESET). Clear chan->ident for all matching channels on success, and harden the failure path by using l2cap_chan_hold_unless_zero() consistent with other L2CAP handlers (l2cap_le_command_rej, __l2cap_get_chan_by_ident).

CVSS Score

References

• https://git.kernel.org/stable/c/00e1950716c6ed67d74777b2db286b0fa23b4be9
• https://git.kernel.org/stable/c/3b5b5f423b4fd23404a393bda8adba3cd6f74ef1
• https://git.kernel.org/stable/c/59f5ecf6ad5c4db6ae81965a96156954a3b0d89a
• https://git.kernel.org/stable/c/8e7977afaef37c6bd2b2654f1bce6ab40d471147
• https://git.kernel.org/stable/c/ae0152d77d101c920769934fb102b18de0c6f526
• https://git.kernel.org/stable/c/c2afd2613fda90107c5e2fe8e855627451749c78
• https://git.kernel.org/stable/c/cc2b4f749de09975bfa06e58bbbad2f6acd4c79c
• https://git.kernel.org/stable/c/f39049304ba655ffcbb92edbdf8c51a1f1210bed