CVE-2025-39997 (GCVE-0-2025-39997)
Vulnerability from cvelistv5
Published
2025-10-15 07:58
Modified
2025-10-15 07:58
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 647410a7da46067953a53c0d03f8680eff570959 Version: c611b9e55174e439dcd85a72969b43a95f3827a4 Version: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 Version: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 Version: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 Version: 62066758d2ae169278e5d6aea5995b1b6f6ddeb5 |
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|
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{
"containers": {
"cna": {
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{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"sound/usb/midi.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"versionType": "git"
},
{
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},
{
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"status": "affected",
"version": "0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1",
"versionType": "git"
},
{
"status": "affected",
"version": "62066758d2ae169278e5d6aea5995b1b6f6ddeb5",
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}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"sound/usb/midi.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.16"
},
{
"lessThan": "6.16",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.16.11",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.17.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.11",
"versionStartIncluding": "6.16",
"vulnerable": true
},
{
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"versionEndExcluding": "6.17.1",
"versionStartIncluding": "6.16",
"vulnerable": true
},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.15.3",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"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": "2025-10-15T07:58:21.702Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba"
},
{
"url": "https://git.kernel.org/stable/c/647d6b8d22be12842fde6ed0c56859ebc615f21e"
},
{
"url": "https://git.kernel.org/stable/c/af600e7f5526d16146b3ae99f6ad57bfea79ca33"
},
{
"url": "https://git.kernel.org/stable/c/353d8c715cc951a980728133c9dd64ca5a0a186c"
},
{
"url": "https://git.kernel.org/stable/c/9f2c0ac1423d5f267e7f1d1940780fc764b0fee3"
}
],
"title": "ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free",
"x_generator": {
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}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2025-39997",
"datePublished": "2025-10-15T07:58:21.702Z",
"dateReserved": "2025-04-16T07:20:57.151Z",
"dateUpdated": "2025-10-15T07:58:21.702Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39997\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-15T08:15:37.947\",\"lastModified\":\"2025-10-16T15:28:59.610\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/353d8c715cc951a980728133c9dd64ca5a0a186c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/647d6b8d22be12842fde6ed0c56859ebc615f21e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f2c0ac1423d5f267e7f1d1940780fc764b0fee3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/af600e7f5526d16146b3ae99f6ad57bfea79ca33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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