CVE-2026-74540
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp l2cap_le_connect_rsp() obtains a channel via __l2cap_get_chan_by_ident() but neither holds a reference nor uses l2cap_chan_hold_unless_zero() before locking and operating on it. A concurrent l2cap_chan_del() triggered by a remote disconnect can free the channel between the lookup and l2cap_chan_lock(), causing a use-after-free. The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero() to safely hold a reference, but l2cap_le_connect_rsp() was left unprotected. Fix by adding l2cap_chan_hold_unless_zero() after the ident lookup and l2cap_chan_put() on the exit path, consistent with other L2CAP response handlers.
How to fix
- Linux Linux15d6c2367217a6a20b1abae9f38ded716bf620f1, 1818180fe12d6cec7a437bc59cde8efdf6b10250, 8325eafb38c3dee5af329266393763693d17381b, fd4c1e301bdec60a40728ea37de531cbccda501a, 522b730c62c53a1981604fd73524697fd347830d, 58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136, 09f447accc2570751e7d17f0dc0788b40d3edade, c4740e7f23ff9a8210198d8b4703259e21b9f69d or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | f1496dee9cbde2a62821f4441dadb0d3360f60c3 ≤ v < 15d6c2367217a6a20b1abae9f38ded716bf620f1, f1496dee9cbde2a62821f4441dadb0d3360f60c3 ≤ v < 1818180fe12d6cec7a437bc59cde8efdf6b10250, f1496dee9cbde2a62821f4441dadb0d3360f60c3 ≤ v < 8325eafb38c3dee5af329266393763693d17381b, f1496dee9cbde2a62821f4441dadb0d3360f60c3 ≤ v < fd4c1e301bdec60a40728ea37de531cbccda501a, f1496dee9cbde2a62821f4441dadb0d3360f60c3 ≤ v < 522b730c62c53a1981604fd73524697fd347830d, f1496dee9cbde2a62821f4441dadb0d3360f60c3 ≤ v < 58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136, f1496dee9cbde2a62821f4441dadb0d3360f60c3 ≤ v < 09f447accc2570751e7d17f0dc0788b40d3edade, f1496dee9cbde2a62821f4441dadb0d3360f60c3 ≤ v < c4740e7f23ff9a8210198d8b4703259e21b9f69d, 3.14 | 15d6c2367217a6a20b1abae9f38ded716bf620f1, 1818180fe12d6cec7a437bc59cde8efdf6b10250, 8325eafb38c3dee5af329266393763693d17381b, fd4c1e301bdec60a40728ea37de531cbccda501a, 522b730c62c53a1981604fd73524697fd347830d, 58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136, 09f447accc2570751e7d17f0dc0788b40d3edade, c4740e7f23ff9a8210198d8b4703259e21b9f69d |
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