ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free
In the Linux kernel, the following vulnerability has been resolved:
ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free
The previous commit 0718a78f6a9f ("ALSA: usb-audio: Kill timer properly at
removal") patched a UAF issue caused by the error timer.
However, because the error timer kill added in this patch occurs after the
endpoint delete, a race condition to UAF still occurs, albeit rarely.
Additionally, since kill-cleanup for urb is also missing, freed memory can
be accessed in interrupt context related to urb, which can cause UAF.
Therefore, to prevent this, error timer and urb must be killed before
freeing the heap memory.
CVE 정보
EPSS
EPSS는 취약점이 악용될 가능성을 예측하는 점수 모델입니다.
EPSS 점수
EPSS 모델은 0과 1(0~100%) 사이의 확률 점수를 생성합니다. 점수가 높을수록 취약점이 악용될 가능성이 높습니다.
날짜
EPSS V0
EPSS V1
EPSS V2 (> 2022-02-04)
EPSS V3 (> 2025-03-07)
EPSS V4 (> 2025-03-17)
2025-10-15
–
–
–
–
0.02%
2025-10-21
–
–
–
–
0.02%
2025-11-16
–
–
–
–
0.03%
2025-11-18
–
–
–
–
0.03%
2025-11-21
–
–
–
–
0.03%
2025-12-18
–
–
–
–
0.03%
2025-12-19
–
–
–
–
0.03%
2025-12-22
–
–
–
–
0.03%
2026-02-22
–
–
–
–
0.04%
2026-03-15
–
–
–
–
0.02%
2026-03-22
–
–
–
–
0.02%
2026-03-29
–
–
–
–
0.03%
2026-05-10
–
–
–
–
0.03%
2026-05-17
–
–
–
–
0.03%
2026-06-07
–
–
–
–
0.04%
EPSS 백분위수
백분위수는 EPSS 점수에 따라 CVE의 순위를 매기는 데 사용됩니다. 예를 들어 EPSS 점수 기준 95번째 백분위수의 CVE는 다른 CVE의 95%보다 악용될 가능성이 높습니다.