Total vulnerabilities in the database
In the Linux kernel, the following vulnerability has been resolved:
ALSA: timer: Don't take register_mutex with copy_from/to_user()
The infamous mmap_lock taken in copy_from/to_user() can be often problematic when it's called inside another mutex, as they might lead to deadlocks.
In the case of ALSA timer code, the bad pattern is with guard(mutex)(®ister_mutex) that covers copy_from/to_user() -- which was mistakenly introduced at converting to guard(), and it had been carefully worked around in the past.
This patch fixes those pieces simply by moving copy_from/to_user() out of the register mutex lock again.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 6.13 | 6.13.11 |
| linux / linux_kernel | 6.14 | 6.14.2 |
| linux / linux_kernel | 6.9 | 6.12.23 |