CVE-2026-74534
Description
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.
How to fix
- Linux Linux42c8bd6ac81e21200bb90f1eaf43d19352eec6d7, 3b921533e8aa95b77aadcf31737595578e735f3c, 8208b4939afb0a1977fffe902c3ca42fe0f3baaa, fdfde532ab1caa165fcd8985001157ac8b4db365, 6.12.113, 6.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | a58d0f5dac322e16cc75334d000666512341bde5 ≤ v < 42c8bd6ac81e21200bb90f1eaf43d19352eec6d7, dc26097bdb864a0d5955b9a25e43376ffc1af99b ≤ v < 3b921533e8aa95b77aadcf31737595578e735f3c, dc26097bdb864a0d5955b9a25e43376ffc1af99b ≤ v < 8208b4939afb0a1977fffe902c3ca42fe0f3baaa, dc26097bdb864a0d5955b9a25e43376ffc1af99b ≤ v < fdfde532ab1caa165fcd8985001157ac8b4db365, f53e7489273dc2bb307bf50f319b3762d45534f0, 6.12.2 ≤ v < 6.12.113, 6.11.11 ≤ v < 6.12, 6.13 | 42c8bd6ac81e21200bb90f1eaf43d19352eec6d7, 3b921533e8aa95b77aadcf31737595578e735f3c, 8208b4939afb0a1977fffe902c3ca42fe0f3baaa, fdfde532ab1caa165fcd8985001157ac8b4db365, 6.12.113, 6.12 |
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