Bluetooth: ISO: fix refcounting of iso_conn

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix refcounting of iso_conn iso_conn_del() and iso_chan_del() have a race that results to double-put of iso_conn: [Task hdev->workqueue] [Task 2] iso_conn_del iso_chan_del iso_conn_hold_unless_zero iso_conn_lock iso_conn_lock conn->sk = NULL iso_conn_unlock sk = iso_sock_hold(conn) <---------´ if (!sk) iso_conn_put iso_conn_put iso_conn_put /* UAF */ The extra put for !sk in iso_conn_del() is currently required since failing iso_chan_add() may leave iso_conn not associated with any sk. Fix by having iso_pi(sk)->conn own refcount when non-NULL, so iso_conn_del does not need to put it. Adjust the iso_conn_add() refcounting so that conn is put if it does not get associated with an sk.

Timeline

1. Aug 15, 2026, 12:27 PM UTCCVE published
2. Oct 16, 2026, 6:59 PM UTCCISA SSVC assessment

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

3. Oct 23, 2026, 8:20 AM UTCRecord last updated

Affected versions

• Linux Linux

  From a58d0f5dac322e16cc75334d000666512341bde5 · fixed in 42c8bd6ac81e21200bb90f1eaf43d19352eec6d7; From dc26097bdb864a0d5955b9a25e43376ffc1af99b · fixed in 3b921533e8aa95b77aadcf31737595578e735f3c; From dc26097bdb864a0d5955b9a25e43376ffc1af99b · fixed in 8208b4939afb0a1977fffe902c3ca42fe0f3baaa; From dc26097bdb864a0d5955b9a25e43376ffc1af99b · fixed in fdfde532ab1caa165fcd8985001157ac8b4db365; From 6.12.2 · fixed in 6.12.113; From 6.11.11 · fixed in 6.12

• Linux Linux

  6.13

• KernelLinux

  fixed in 6.12.113; From 6.13.0 · fixed in 6.18.44; fixed in 7.1.8

References 4