CVE-2026-23063

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

uacce: ensure safe queue release with state management

Directly calling `put_queue` carries risks since it cannot
guarantee that resources of `uacce_queue` have been fully released
beforehand. So adding a `stop_queue` operation for the
UACCE_CMD_PUT_Q command and leaving the `put_queue` operation to
the final resource release ensures safety.

Queue states are defined as follows:
– UACCE_Q_ZOMBIE: Initial state
– UACCE_Q_INIT: After opening `uacce`
– UACCE_Q_STARTED: After `start` is issued via `ioctl`

When executing `poweroff -f` in virt while accelerator are still
working, `uacce_fops_release` and `uacce_remove` may execute
concurrently. This can cause `uacce_put_queue` within
`uacce_fops_release` to access a NULL `ops` pointer. Therefore, add
state checks to prevent accessing freed pointers.

More information : https://git.kernel.org/stable/c/26c08dabe5475d99a13f353d8dd70e518de45663