CVE-2023-52736

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ALSA: hda: Do not unset preset when cleaning up codec<br /> <br /> Several functions that take part in codec&amp;#39;s initialization and removal<br /> are re-used by ASoC codec drivers implementations. Drivers mimic the<br /> behavior of hda_codec_driver_probe/remove() found in<br /> sound/pci/hda/hda_bind.c with their component-&gt;probe/remove() instead.<br /> <br /> One of the reasons for that is the expectation of<br /> snd_hda_codec_device_new() to receive a valid pointer to an instance of<br /> struct snd_card. This expectation can be met only once sound card<br /> components probing commences.<br /> <br /> As ASoC sound card may be unbound without codec device being actually<br /> removed from the system, unsetting -&gt;preset in<br /> snd_hda_codec_cleanup_for_unbind() interferes with module unload -&gt; load<br /> scenario causing null-ptr-deref. Preset is assigned only once, during<br /> device/driver matching whereas ASoC codec driver&amp;#39;s module reloading may<br /> occur several times throughout the lifetime of an audio stack.