CVE-2026-74536
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix leaking sk after socket release iso_sock_kill() tests !sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket || sock_flag(sk, SOCK_DEAD) for early return, but this is always true since sock_orphan(sk) sets SOCK_DEAD, so the sk reference released by socket always leaks, iso_sock_destruct is never called. The socket reference also leaks when __iso_sock_close() does not set SOCK_ZAPPED, since iso_conn_del() does not call iso_sock_kill() after zapping. Fix by replacing SOCK_DEAD by BT_SK_KILLED flag that is not used for something else, and lock_sock to ensure iso_sock_kill() puts sk only after socket release only once. Release and iso_conn_del may run concurrently. Call iso_sock_kill() from iso_conn_del() to clean sk up after zapping. Remove call to iso_sock_kill() from iso_sock_close(), as it's generally no-op there.
How to fix
- Linux Linux96ed3c772c08e7a91c399567f412618e43231023, e76a0ae6542ae43241b2147bacf4990e7ae5316a, e30e5ca63c8fbe3cd505fbb419bb547760cda633, ce57442a379212fe3fda59c9437ee8217eceb5b1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | ccf74f2390d60a2f9a75ef496d2564abb478f46a ≤ v < 96ed3c772c08e7a91c399567f412618e43231023, ccf74f2390d60a2f9a75ef496d2564abb478f46a ≤ v < e76a0ae6542ae43241b2147bacf4990e7ae5316a, ccf74f2390d60a2f9a75ef496d2564abb478f46a ≤ v < e30e5ca63c8fbe3cd505fbb419bb547760cda633, ccf74f2390d60a2f9a75ef496d2564abb478f46a ≤ v < ce57442a379212fe3fda59c9437ee8217eceb5b1, 6.0 | 96ed3c772c08e7a91c399567f412618e43231023, e76a0ae6542ae43241b2147bacf4990e7ae5316a, e30e5ca63c8fbe3cd505fbb419bb547760cda633, ce57442a379212fe3fda59c9437ee8217eceb5b1 |
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