CVE-2026-74540High· 8.8▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
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.
Linux >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 15d6c2367217a6a20b1abae9f38ded716bf620f1Linux >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 1818180fe12d6cec7a437bc59cde8efdf6b10250Linux >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 8325eafb38c3dee5af329266393763693d17381bLinux >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < fd4c1e301bdec60a40728ea37de531cbccda501aLinux >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 522b730c62c53a1981604fd73524697fd347830dLinux >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136Linux >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 09f447accc2570751e7d17f0dc0788b40d3edadeLinux >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < c4740e7f23ff9a8210198d8b4703259e21b9f69dLinux 3.14Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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