GHSA-xc3r-7j5x-74w4
Record from GitHub Advisory Database · Published October 15, 2025
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.
Timeline
- Oct 15, 2025 CVE Published
- Apr 10, 2026 Security Advisory
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References
- https://git.kernel.org/stable/c/353d8c715cc951a980728133c9dd64ca5a0a186c url
- https://git.kernel.org/stable/c/9f2c0ac1423d5f267e7f1d1940780fc764b0fee3 url
- https://nvd.nist.gov/vuln/detail/CVE-2025-39997 advisory
- https://git.kernel.org/stable/c/647d6b8d22be12842fde6ed0c56859ebc615f21e url
- https://git.kernel.org/stable/c/af600e7f5526d16146b3ae99f6ad57bfea79ca33 url
- https://git.kernel.org/stable/c/dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba url
- https://git.kernel.org/stable/c/e16985513e89466a236d2a7c202783b4dd0c5a46 url
- https://git.kernel.org/stable/c/e63f049c7764b615d1d50cb486745fa63372b42d url