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CVE-2026-74540

Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From f1496dee9cbde2a62821f4441dadb0d3360f60c3 · fixed in 15d6c2367217a6a20b1abae9f38ded716bf620f1; From f1496dee9cbde2a62821f4441dadb0d3360f60c3 · fixed in 1818180fe12d6cec7a437bc59cde8efdf6b10250; From f1496dee9cbde2a62821f4441dadb0d3360f60c3 · fixed in 8325eafb38c3dee5af329266393763693d17381b; From f1496dee9cbde2a62821f4441dadb0d3360f60c3 · fixed in fd4c1e301bdec60a40728ea37de531cbccda501a; From f1496dee9cbde2a62821f4441dadb0d3360f60c3 · fixed in 522b730c62c53a1981604fd73524697fd347830d; From f1496dee9cbde2a62821f4441dadb0d3360f60c3 · fixed in 58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136; From f1496dee9cbde2a62821f4441dadb0d3360f60c3 · fixed in 09f447accc2570751e7d17f0dc0788b40d3edade; From f1496dee9cbde2a62821f4441dadb0d3360f60c3 · fixed in c4740e7f23ff9a8210198d8b4703259e21b9f69d

  • Linux Linux

    3.14

  • KernelLinux

    From 3.14.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.151; From 6.7.0 · fixed in 6.12.103; From 6.13.0 · fixed in 6.18.44; From 6.19.0 · fixed in 7.1.8

References 8

git.kernel.org