CVE-2026-90032 (GCVE-0-2026-90032)
Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-09-16 14:41
VLAI
EPSS
VEX
Title
media: usbtv: keep device alive while ALSA card exists
Summary
In the Linux kernel, the following vulnerability has been resolved:
media: usbtv: keep device alive while ALSA card exists
The ALSA PCM callbacks store the driver state in pcm->private_data. An
open PCM file can outlive USB disconnect because usbtv_audio_free() uses
snd_card_free_when_closed(). The disconnect path can then drop the V4L2
device reference and free struct usbtv before ALSA releases the substream,
so a later close dereferences freed memory in snd_usbtv_pcm_close().
Take a V4L2 device reference for the ALSA card and drop it from the card
private_free callback. This keeps struct usbtv valid until ALSA has closed
the remaining files and freed the card.
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
63ddf68de52efaac40a9287e44266ac30e71dd36 , < 97b5e8b22b98e287481a97a9a4cfebbb348738a5
(git)
Affected: 63ddf68de52efaac40a9287e44266ac30e71dd36 , < 503be26ff888cb3576e55d251895d290e8146f27 (git) Affected: 63ddf68de52efaac40a9287e44266ac30e71dd36 , < be0f7745f883386e5263b4e475686a81dfa87175 (git) Affected: 63ddf68de52efaac40a9287e44266ac30e71dd36 , < 67374e3a00814dcdd46e9feca61f69f7f2d81957 (git) Affected: 63ddf68de52efaac40a9287e44266ac30e71dd36 , < 239d1683e08b2aee2a15ef35706e1ea9a76681d8 (git) Affected: 63ddf68de52efaac40a9287e44266ac30e71dd36 , < 7690a86b193271322cd31ab77349a87aa10858e4 (git) Affected: 63ddf68de52efaac40a9287e44266ac30e71dd36 , < 1618257cb0aba4ce342ae8c0228368c24161f5fb (git) Affected: 63ddf68de52efaac40a9287e44266ac30e71dd36 , < fc530fe168bb2b745a93f553ad21fc25fd9cba3d (git) |
guessed | |
| Linux | Linux |
Affected:
3.18
Unaffected: 0 , < 3.18 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/media/usb/usbtv/usbtv-audio.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "97b5e8b22b98e287481a97a9a4cfebbb348738a5",
"status": "affected",
"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
"versionType": "git"
},
{
"lessThan": "503be26ff888cb3576e55d251895d290e8146f27",
"status": "affected",
"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
"versionType": "git"
},
{
"lessThan": "be0f7745f883386e5263b4e475686a81dfa87175",
"status": "affected",
"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
"versionType": "git"
},
{
"lessThan": "67374e3a00814dcdd46e9feca61f69f7f2d81957",
"status": "affected",
"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
"versionType": "git"
},
{
"lessThan": "239d1683e08b2aee2a15ef35706e1ea9a76681d8",
"status": "affected",
"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
"versionType": "git"
},
{
"lessThan": "7690a86b193271322cd31ab77349a87aa10858e4",
"status": "affected",
"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
"versionType": "git"
},
{
"lessThan": "1618257cb0aba4ce342ae8c0228368c24161f5fb",
"status": "affected",
"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
"versionType": "git"
},
{
"lessThan": "fc530fe168bb2b745a93f553ad21fc25fd9cba3d",
"status": "affected",
"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/media/usb/usbtv/usbtv-audio.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.18"
},
{
"lessThan": "3.18",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.270",
"versionStartIncluding": "3.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.221",
"versionStartIncluding": "3.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.188",
"versionStartIncluding": "3.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.157",
"versionStartIncluding": "3.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.110",
"versionStartIncluding": "3.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.51",
"versionStartIncluding": "3.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.5",
"versionStartIncluding": "3.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3-rc1",
"versionStartIncluding": "3.18",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: usbtv: keep device alive while ALSA card exists\n\nThe ALSA PCM callbacks store the driver state in pcm-\u003eprivate_data. An\nopen PCM file can outlive USB disconnect because usbtv_audio_free() uses\nsnd_card_free_when_closed(). The disconnect path can then drop the V4L2\ndevice reference and free struct usbtv before ALSA releases the substream,\nso a later close dereferences freed memory in snd_usbtv_pcm_close().\n\nTake a V4L2 device reference for the ALSA card and drop it from the card\nprivate_free callback. This keeps struct usbtv valid until ALSA has closed\nthe remaining files and freed the card."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The UAF is reached locally by opening the usbtv ALSA capture PCM, forcing usbtv_disconnect() via USBDEVFS_DISCONNECT or sysfs unbind on an already-bound USBTV007, then closing the PCM fd; there is no network or packet path. This matches AV:L scoring of analogous USB disconnect UAFs (CVE-2026-80971, CVE-2026-64585); physical unplug is only an extra path.\nAC:L - The attacker fully controls the sequence: open /dev/snd/pcmC*D*c so PCM callbacks pin pcm-\u003eprivate_data, issue USBDEVFS_DISCONNECT so snd_card_free_when_closed() returns without waiting, then close. That close deterministically hits freed struct usbtv in snd_usbtv_pcm_close(); no attacker-uncontrollable race or layout is required.\nPR:L - USBDEVFS_DISCONNECT has no capable() check, only write access to /dev/bus/usb that udev uaccess/plugdev rules grant seat users, and snd_pcm_open() has no capability gate on the capture PCM node (audio group/uaccess). An unprivileged local account suffices; init-namespace root is not required.\nUI:N - The attacker performs open, disconnect, and close on their own fds against an already-attached USBTV007 (capture kiosk, digitizer, or surveillance station). No separate victim action such as plugging a device or clicking is required during exploitation.\nS:U - The slab use-after-free of struct usbtv and the PCM close/trigger callbacks run entirely in the host kernel. This is ordinary local privilege escalation, not a VM, IOMMU, or sandbox boundary escape.\nC:H - snd_usbtv_pcm_close() and snd_usbtv_card_trigger() read fields of the kfree()\u0027d struct usbtv (snd_stream, snd_trigger, snd_bulk_urb). Reclaiming that slab lets the attacker supply pointer-rich state those paths then read, enabling kernel disclosure as with other heap UAFs.\nI:H - Close can atomic_set snd_stream and schedule_work() on the freed usbtv.snd_trigger work_struct, and snd_pcm_drop may call trigger STOP on the same freed object. A reclaimed fake usbtv plus workqueue execution is a control-flow hijack primitive, so integrity impact is High.\nA:H - Use-after-free of struct usbtv in snd_usbtv_pcm_close() (and in usbtv_audio_urb_received if capture was running when USB core kills the URB after disconnect) oopses or panics the kernel. The attacker can repeat disconnect/close to crash on demand, so availability impact is High."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-16T14:41:46.318Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/97b5e8b22b98e287481a97a9a4cfebbb348738a5"
},
{
"url": "https://git.kernel.org/stable/c/503be26ff888cb3576e55d251895d290e8146f27"
},
{
"url": "https://git.kernel.org/stable/c/be0f7745f883386e5263b4e475686a81dfa87175"
},
{
"url": "https://git.kernel.org/stable/c/67374e3a00814dcdd46e9feca61f69f7f2d81957"
},
{
"url": "https://git.kernel.org/stable/c/239d1683e08b2aee2a15ef35706e1ea9a76681d8"
},
{
"url": "https://git.kernel.org/stable/c/7690a86b193271322cd31ab77349a87aa10858e4"
},
{
"url": "https://git.kernel.org/stable/c/1618257cb0aba4ce342ae8c0228368c24161f5fb"
},
{
"url": "https://git.kernel.org/stable/c/fc530fe168bb2b745a93f553ad21fc25fd9cba3d"
}
],
"title": "media: usbtv: keep device alive while ALSA card exists",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-90032",
"datePublished": "2026-09-16T10:33:33.197Z",
"dateReserved": "2026-09-11T19:38:34.782Z",
"dateUpdated": "2026-09-16T14:41:46.318Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-90032\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-16T11:17:16.310\",\"lastModified\":\"2026-09-16T15:18:26.280\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmedia: usbtv: keep device alive while ALSA card exists\\n\\nThe ALSA PCM callbacks store the driver state in pcm-\u003eprivate_data. An\\nopen PCM file can outlive USB disconnect because usbtv_audio_free() uses\\nsnd_card_free_when_closed(). The disconnect path can then drop the V4L2\\ndevice reference and free struct usbtv before ALSA releases the substream,\\nso a later close dereferences freed memory in snd_usbtv_pcm_close().\\n\\nTake a V4L2 device reference for the ALSA card and drop it from the card\\nprivate_free callback. This keeps struct usbtv valid until ALSA has closed\\nthe remaining files and freed the card.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/media/usb/usbtv/usbtv-audio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"63ddf68de52efaac40a9287e44266ac30e71dd36\",\"lessThan\":\"97b5e8b22b98e287481a97a9a4cfebbb348738a5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"63ddf68de52efaac40a9287e44266ac30e71dd36\",\"lessThan\":\"503be26ff888cb3576e55d251895d290e8146f27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"63ddf68de52efaac40a9287e44266ac30e71dd36\",\"lessThan\":\"be0f7745f883386e5263b4e475686a81dfa87175\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"63ddf68de52efaac40a9287e44266ac30e71dd36\",\"lessThan\":\"67374e3a00814dcdd46e9feca61f69f7f2d81957\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"63ddf68de52efaac40a9287e44266ac30e71dd36\",\"lessThan\":\"239d1683e08b2aee2a15ef35706e1ea9a76681d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"63ddf68de52efaac40a9287e44266ac30e71dd36\",\"lessThan\":\"7690a86b193271322cd31ab77349a87aa10858e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"63ddf68de52efaac40a9287e44266ac30e71dd36\",\"lessThan\":\"1618257cb0aba4ce342ae8c0228368c24161f5fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"63ddf68de52efaac40a9287e44266ac30e71dd36\",\"lessThan\":\"fc530fe168bb2b745a93f553ad21fc25fd9cba3d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/media/usb/usbtv/usbtv-audio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.51\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.5\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1618257cb0aba4ce342ae8c0228368c24161f5fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/239d1683e08b2aee2a15ef35706e1ea9a76681d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/503be26ff888cb3576e55d251895d290e8146f27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/67374e3a00814dcdd46e9feca61f69f7f2d81957\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7690a86b193271322cd31ab77349a87aa10858e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97b5e8b22b98e287481a97a9a4cfebbb348738a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be0f7745f883386e5263b4e475686a81dfa87175\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc530fe168bb2b745a93f553ad21fc25fd9cba3d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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