CVE-2026-46004ALSA: caiaq: Handle probe errors properly

Official description

In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: Handle probe errors properly The probe procedure of setup_card() in caiaq driver doesn't treat the error cases gracefully, e.g. the error from snd_card_register() calls snd_card_free() but continues. This would lead to a UAF for the further calls like snd_usb_caiaq_control_init(), as Berk suggested in another patch in the link below. However, the problem is not only that; in general, this function drops the all error handlings (as it's a void function) although its caller can propagate an error to snd_probe(), which eventually calls snd_card_free() as a proper error path. That said, we should treat each error case in setup_card(), and just return the error code promptly, which is then handled later as a fatal error in snd_probe(). This patch achieves it by changing the setup_card() to return an error code. Also, the superfluous snd_card_free() call is removed, too. Note that card->private_free can be set still safely at returning an error. All called functions in card_free() have checks of the unassigned resources or NULL checks.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/da938aa9fc7826901921dcea225948ab21a97e45
• https://git.kernel.org/stable/c/09616e25f502080ba684fc7fcf959d1376ab756d
• https://git.kernel.org/stable/c/b956e48371f2ff72b76be9a829800ecec963bd45
• https://git.kernel.org/stable/c/f537e3ad69609f6924a4db6b4a7f6561f5288bdd
• https://git.kernel.org/stable/c/6251e3e256337a30160ef59ab1580dde4d1acd28
• https://git.kernel.org/stable/c/e59ecd4ee3a450db6cb4e4ecaa3efdd593f80056
• https://git.kernel.org/stable/c/096dd8519cf2f768e9e14f224b627f7aaee1a9c5
• https://git.kernel.org/stable/c/28abd224db4a49560b452115bca3672a20e45b2f