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CVE-2022-49733 – ALSA OSS PCM Null Pointer Dereference Vulnerability

The following table lists the changes that have been made to the
CVE-2022-49733 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Mar. 02, 2025

    Action Type Old Value New Value
    Added Description 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.
    Added Reference https://git.kernel.org/stable/c/4051324a6dafd7053c74c475e80b3ba10ae672b0
    Added Reference https://git.kernel.org/stable/c/723ac5ab2891b6c10dd6cc78ef5456af593490eb
    Added Reference https://git.kernel.org/stable/c/8015ef9e8a0ee5cecfd0cb6805834d007ab26f86
    Added Reference https://git.kernel.org/stable/c/8423f0b6d513b259fdab9c9bf4aaa6188d054c2d
    Added Reference https://git.kernel.org/stable/c/fce793a056c604b41a298317cf704dae255f1b36
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