CVE-2026-74533
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero hci_conn::iso_data is accessed and modified without lock or RCU. This leads to a race [Task hdev->workqueue] [Task 2] iso_recv iso_conn_put(conn) conn = LOAD hcon->iso_data iso_conn_free(conn) iso_conn_hold_unless_zero(conn) hcon->iso_data = NULL kfree(conn) kref_get_unless_zero(&conn->ref) /* UAF */ and also to races in iso_conn_add() vs. iso_conn_free(). Fix by adding spinlock hci_conn::proto_lock and using it to guard hci_conn::iso_data.
Affected versions
Linux kernel versions
6.11.11,
6.12.2,
6.13
and later are affected. Fixed in
7.1.8,
7.2-rc6
and their respective stable series.
References
2 totalFrequently asked questions
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What is CVE-2026-74533?
CVE-2026-74533 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.11.11 onward and has been patched in 7.1.8 and 7.2-rc6. CVE-2026-74533 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-74533?
Yes. CVE-2026-74533 has been patched. Fixed versions include 7.1.8 and 7.2-rc6. If you are running Linux kernel 6.11.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-74533 actively exploited?
No. CVE-2026-74533 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.