CVE-2026-74536 is a vulnerability in Linux Kernel
Published on August 15, 2026
Bluetooth: ISO: fix leaking sk after socket release
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.
Products Associated with CVE-2026-74536
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Affected Versions
Linux:- Version ccf74f2390d60a2f9a75ef496d2564abb478f46a and below 96ed3c772c08e7a91c399567f412618e43231023 is affected.
- Version ccf74f2390d60a2f9a75ef496d2564abb478f46a and below e76a0ae6542ae43241b2147bacf4990e7ae5316a is affected.
- Version ccf74f2390d60a2f9a75ef496d2564abb478f46a and below e30e5ca63c8fbe3cd505fbb419bb547760cda633 is affected.
- Version ccf74f2390d60a2f9a75ef496d2564abb478f46a and below ce57442a379212fe3fda59c9437ee8217eceb5b1 is affected.
- Version 6.0 is affected.
- Before 6.0 is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2-rc6, <= * is unaffected.