In the Linux kernel, the following vulnerability has been resolved:

ALSA: pcm: oss: Fix race at SNDCTL_DSP_SYNC

There is a small race window at snd_pcm_oss_sync() that is called from
OSS PCM SNDCTL_DSP_SYNC ioctl; namely the function calls
snd_pcm_oss_make_ready() at first, then takes the params_lock mutex
for the rest.  When the stream is set up again by another thread
between them, it leads to inconsistency, and may result in unexpected
results such as NULL dereference of OSS buffer as a fuzzer spotted
recently.

The fix is simply to cover snd_pcm_oss_make_ready() call into the same
params_lock mutex with snd_pcm_oss_make_ready_locked() variant.

https://git.kernel.org/stable/c/4051324a6dafd7053c74c475e80b3ba10ae672b0

https://git.kernel.org/stable/c/723ac5ab2891b6c10dd6cc78ef5456af593490eb

https://git.kernel.org/stable/c/8015ef9e8a0ee5cecfd0cb6805834d007ab26f86

https://git.kernel.org/stable/c/8423f0b6d513b259fdab9c9bf4aaa6188d054c2d

https://git.kernel.org/stable/c/fce793a056c604b41a298317cf704dae255f1b36