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    <link>https://vulnerability.circl.lu</link>
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      <title>CVE-2022-50229 — ALSA: bcd2000: Fix a UAF bug on the error path of probing</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2022-50229</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;ALSA: bcd2000: Fix a UAF bug on the error path of probing&lt;/p&gt;
&lt;p&gt;When the driver fails in snd_card_register() at probe time, it will free
the &amp;#39;bcd2k-&amp;gt;midi_out_urb&amp;#39; before killing it, which may cause a UAF bug.&lt;/p&gt;
&lt;p&gt;The following log can reveal it:&lt;/p&gt;
&lt;p&gt;[   50.727020] BUG: KASAN: use-after-free in bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000]
[   50.727623] Read of size 8 at addr ffff88810fab0e88 by task swapper/4/0
[   50.729530] Call Trace:
[   50.732899]  bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000]&lt;/p&gt;
&lt;p&gt;Fix this by adding usb_kill_urb() before usb_free_urb().&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;ALSA: bcd2000: Fix a UAF bug on the error path of probing&lt;/p&gt;
&lt;p&gt;When the driver fails in snd_card_register() at probe time, it will free
the &amp;#39;bcd2k-&amp;gt;midi_out_urb&amp;#39; before killing it, which may cause a UAF bug.&lt;/p&gt;
&lt;p&gt;The following log can reveal it:&lt;/p&gt;
&lt;p&gt;[   50.727020] BUG: KASAN: use-after-free in bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000]
[   50.727623] Read of size 8 at addr ffff88810fab0e88 by task swapper/4/0
[   50.729530] Call Trace:
[   50.732899]  bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000]&lt;/p&gt;
&lt;p&gt;Fix this by adding usb_kill_urb() before usb_free_urb().&lt;/p&gt;</content:encoded>
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