CVE-2025-39997 (GCVE-0-2025-39997)
Vulnerability from cvelistv5 – Published: 2025-10-15 07:58 – Updated: 2026-10-15 01:08
VLAI
EPSS
VEX
Title
ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free
Summary
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.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
06513dd6d32c37d0364db8488cfdf3e14da238a8 , < e63f049c7764b615d1d50cb486745fa63372b42d
(git)
Affected: efaf61052b8ff9ee8968912fbaf02c2847c78ede , < e16985513e89466a236d2a7c202783b4dd0c5a46 (git) Affected: 647410a7da46067953a53c0d03f8680eff570959 , < dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba (git) Affected: c611b9e55174e439dcd85a72969b43a95f3827a4 , < 647d6b8d22be12842fde6ed0c56859ebc615f21e (git) Affected: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 , < af600e7f5526d16146b3ae99f6ad57bfea79ca33 (git) Affected: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 , < 353d8c715cc951a980728133c9dd64ca5a0a186c (git) Affected: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 , < 9f2c0ac1423d5f267e7f1d1940780fc764b0fee3 (git) Affected: 62066758d2ae169278e5d6aea5995b1b6f6ddeb5 (git) Affected: 6.1.167 , < 6.1.175 (semver) Affected: 6.15.3 , < 6.16 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.16
Unaffected: 0 , < 6.16 (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.16.11 , ≤ 6.16.* (semver) Unaffected: 6.17.1 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed |
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"version": "6.1.167",
"versionType": "semver"
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"versionType": "original_commit_for_fix"
}
]
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],
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"descriptions": [
{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free\n\nThe previous commit 0718a78f6a9f (\"ALSA: usb-audio: Kill timer properly at\nremoval\") patched a UAF issue caused by the error timer.\n\nHowever, because the error timer kill added in this patch occurs after the\nendpoint delete, a race condition to UAF still occurs, albeit rarely.\n\nAdditionally, since kill-cleanup for urb is also missing, freed memory can\nbe accessed in interrupt context related to urb, which can cause UAF.\n\nTherefore, to prevent this, error timer and urb must be killed before\nfreeing the heap memory."
}
],
"providerMetadata": {
"dateUpdated": "2026-06-01T16:05:31.937Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/e63f049c7764b615d1d50cb486745fa63372b42d"
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{
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"datePublished": "2025-10-15T07:58:21.702Z",
"dateReserved": "2025-04-16T07:20:57.151Z",
"dateUpdated": "2026-10-15T01:08:48.788Z",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free\n\nThe previous commit 0718a78f6a9f (\"ALSA: usb-audio: Kill timer properly at\nremoval\") patched a UAF issue caused by the error timer.\n\nHowever, because the error timer kill added in this patch occurs after the\nendpoint delete, a race condition to UAF still occurs, albeit rarely.\n\nAdditionally, since kill-cleanup for urb is also missing, freed memory can\nbe accessed in interrupt context related to urb, which can cause UAF.\n\nTherefore, to prevent this, error timer and urb must be killed before\nfreeing the heap memory."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nALSA: usb-audio: corregir condici\u00f3n de carrera a UAF en snd_usbmidi_free\n\nEl commit anterior 0718a78f6a9f (\u0027ALSA: usb-audio: Eliminar temporizador correctamente al retirar\u0027) parche\u00f3 un problema de UAF causado por el temporizador de error.\n\nSin embargo, debido a que la eliminaci\u00f3n del temporizador de error a\u00f1adida en este parche ocurre despu\u00e9s de la eliminaci\u00f3n del punto final, una condici\u00f3n de carrera a UAF todav\u00eda ocurre, aunque raramente.\n\nAdem\u00e1s, dado que la limpieza de eliminaci\u00f3n para urb tambi\u00e9n falta, la memoria liberada puede ser accedida en contexto de interrupci\u00f3n relacionado con urb, lo que puede causar UAF.\n\nPor lo tanto, para prevenir esto, el temporizador de error y urb deben ser eliminados antes de liberar la memoria del mont\u00f3n."
}
],
"id": "CVE-2025-39997",
"lastModified": "2026-10-19T21:10:00.160",
"metrics": {},
"published": "2025-10-15T08:15:37.947",
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},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-30T10:19:21+00:00",
"cve": "CVE-2025-39997",
"id": "CVE-2025-39997",
"initial_release_date": "2025-10-15T00:00:00+00:00",
"product_status:known_affected": "76",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Linux kernel: Use-After-Free in ALSA USB audio due to race condition",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39997.json",
"version": "3"
}
}
}
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