CVE-2022-49291
Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: Fix races among concurrent hw_params and hw_free calls Currently we have neither proper check nor protection against the concurrent calls of PCM hw_params and hw_free ioctls, which may result in a UAF. Since the existing PCM stream lock can't be used for protecting the whole ioctl operations, we need a new mutex to protect those racy calls. This patch introduced a new mutex, runtime->buffer_mutex, and applies it to both hw_params and hw_free ioctl code paths. Along with it, the both functions are slightly modified (the mmap_count check is moved into the state-check block) for code simplicity.
How to fix
- linux linux_kernel4.14.279, 4.19.243, 5.4.193, 5.10.109, 5.15.32, 5.16.18, 5.17.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 4.14.279, 4.15 ≤ v < 4.19.243, 4.20 ≤ v < 5.4.193, 5.5 ≤ v < 5.10.109, 5.11 ≤ v < 5.15.32, 5.16 ≤ v < 5.16.18, 5.17 ≤ v < 5.17.1 | 4.14.279, 4.19.243, 5.4.193, 5.10.109, 5.15.32, 5.16.18, 5.17.1 |
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