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      <title>CVE-2026-74533 — Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-74533</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero&lt;/p&gt;
&lt;p&gt;hci_conn::iso_data is accessed and modified without lock or RCU.
This leads to a race&lt;/p&gt;
&lt;p&gt;[Task hdev-&amp;gt;workqueue]                 	[Task 2]
    iso_recv                                    iso_conn_put(conn)
      conn = LOAD hcon-&amp;gt;iso_data                  iso_conn_free(conn)
      iso_conn_hold_unless_zero(conn)               hcon-&amp;gt;iso_data = NULL
                                                    kfree(conn)
        kref_get_unless_zero(&amp;amp;conn-&amp;gt;ref) /* UAF */&lt;/p&gt;
&lt;p&gt;and also to races in iso_conn_add() vs. iso_conn_free().&lt;/p&gt;
&lt;p&gt;Fix by adding spinlock hci_conn::proto_lock and using it to guard
hci_conn::iso_data.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero&lt;/p&gt;
&lt;p&gt;hci_conn::iso_data is accessed and modified without lock or RCU.
This leads to a race&lt;/p&gt;
&lt;p&gt;[Task hdev-&amp;gt;workqueue]                 	[Task 2]
    iso_recv                                    iso_conn_put(conn)
      conn = LOAD hcon-&amp;gt;iso_data                  iso_conn_free(conn)
      iso_conn_hold_unless_zero(conn)               hcon-&amp;gt;iso_data = NULL
                                                    kfree(conn)
        kref_get_unless_zero(&amp;amp;conn-&amp;gt;ref) /* UAF */&lt;/p&gt;
&lt;p&gt;and also to races in iso_conn_add() vs. iso_conn_free().&lt;/p&gt;
&lt;p&gt;Fix by adding spinlock hci_conn::proto_lock and using it to guard
hci_conn::iso_data.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-74533</guid>
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