ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2025-39997 · Microsoft / collected KEV context

cve-program · CVE-2025-39997

• https://git.kernel.org/stable/c/e63f049c7764b615d1d50cb486745fa63372b42d
• https://git.kernel.org/stable/c/e16985513e89466a236d2a7c202783b4dd0c5a46
• https://git.kernel.org/stable/c/dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba
• https://git.kernel.org/stable/c/647d6b8d22be12842fde6ed0c56859ebc615f21e
• https://git.kernel.org/stable/c/af600e7f5526d16146b3ae99f6ad57bfea79ca33
• https://git.kernel.org/stable/c/353d8c715cc951a980728133c9dd64ca5a0a186c
• https://git.kernel.org/stable/c/9f2c0ac1423d5f267e7f1d1940780fc764b0fee3

No related operational record is retained in the current change model.