CVE-2026-74540
CVE CVE-2026-74540EUVD EUVD-2026-59733Published 2026-08-15T12:27:51.000ZLast changed 2026-08-19T16:38:32.000ZCVSS 8.8
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.1.183; patch: 6.18.44; f1496dee9cbde2a62821f4441dadb0d3360f60c3 <09f447accc2570751e7d17f0dc0788b40d3edade; f1496dee9cbde2a62821f4441dadb0d3360f60c3 <522b730c62c53a1981604fd73524697fd347830d; 3.14; f1496dee9cbde2a62821f4441dadb0d3360f60c3 <fd4c1e301bdec60a40728ea37de531cbccda501a; patch: 0; f1496dee9cbde2a62821f4441dadb0d3360f60c3 <58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136; f1496dee9cbde2a62821f4441dadb0d3360f60c3 <1818180fe12d6cec7a437bc59cde8efdf6b10250; f1496dee9cbde2a62821f4441dadb0d3360f60c3 <c4740e7f23ff9a8210198d8b4703259e21b9f69d; f1496dee9cbde2a62821f4441dadb0d3360f60c3 <15d6c2367217a6a20b1abae9f38ded716bf620f1; patch: 7.2; patch: 6.6.151; patch: 7.1.8; f1496dee9cbde2a62821f4441dadb0d3360f60c3 <8325eafb38c3dee5af329266393763693d17381b; patch: 5.10.265; patch: 6.12.103; patch: 5.15.216
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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