CVE-2026-74497 (GCVE-0-2026-74497)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-19 16:37
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ALSA: usb-audio: Clamp frame size in implicit-feedback mode
snd_usb_handle_sync_urb() scales received sync packet sizes by the sender's
stride and stores the result directly in out_packet->packet_size[i]. If a
connected USB device sends an oversized sync packet, this frame count can
exceed ep->maxframesize.
The un-clamped frame count then propagates to the playback endpoint queue,
potentially driving packet transfers beyond the endpoint's hardware frame
limits.
Cap the calculated frame count against ep->maxframesize in
snd_usb_handle_sync_urb() to prevent oversized packets from entering the
playback queue.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 Version: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 Version: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 Version: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 Version: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 Version: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 Version: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 Version: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"sound/usb/endpoint.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "28acb12014fb0c3e1edfdab1b1e3e266cf651550",
"versionType": "git"
},
{
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{
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"versionType": "git"
},
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]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"sound/usb/endpoint.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.8"
},
{
"lessThan": "3.8",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.265",
"versionStartIncluding": "3.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "3.8",
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},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.103",
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},
{
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},
{
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{
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"versionStartIncluding": "3.8",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Clamp frame size in implicit-feedback mode\n\nsnd_usb_handle_sync_urb() scales received sync packet sizes by the sender\u0027s\nstride and stores the result directly in out_packet-\u003epacket_size[i]. If a\nconnected USB device sends an oversized sync packet, this frame count can\nexceed ep-\u003emaxframesize.\n\nThe un-clamped frame count then propagates to the playback endpoint queue,\npotentially driving packet transfers beyond the endpoint\u0027s hardware frame\nlimits.\n\nCap the calculated frame count against ep-\u003emaxframesize in\nsnd_usb_handle_sync_urb() to prevent oversized packets from entering the\nplayback queue."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is reached via local ALSA USB-audio PCM syscalls (open/hw_params/prepare/trigger) that start isochronous streaming; once implicit-feedback playback is active, malicious inbound USB sync URB completions invoke snd_usb_handle_sync_urb() without any network path.\nAC:L - A malicious USB audio gadget can deterministically send oversized implicit-feedback sync isochronous packets during active playback; the attacker controls both the device firmware and timing, with no race or uncontrollable memory-layout dependency required.\nPR:N - Exploitation is driven by a connected malicious USB audio device sending crafted isochronous IN packets; the attacker needs no host account, kernel capability, or user-namespace privilege on the victim system once playback is running.\nUI:N - After implicit-feedback USB audio playback is started, the malicious device can continuously inject oversized sync packets without further victim interaction; no additional discretionary user actions are needed beyond normal streaming operation.\nS:U - Impact is confined to host-kernel USB-audio transfer-buffer corruption and crashes within the same kernel security authority; it does not constitute a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - Uncapped frame counts stored in the playback queue propagate into URB preparation, causing out-of-bounds access against kernel-coherent USB DMA transfer buffers and adjacent heap memory, enabling information disclosure from corrupted kernel memory.\nI:H - Oversized packet_size values drive memset/copy and iso_frame_desc lengths beyond allocated URB buffer bounds in prepare_silent_urb() and prepare_playback_urb(), yielding controllable out-of-bounds kernel memory writes and heap corruption.\nA:H - The resulting kernel memory corruption and invalid oversized URB transfers trigger kernel oops/panic and repeatable audio-pipeline failure; related mitigations for this implicit-feedback packet-size mismatch explicitly document crash behavior from the same root cause."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:37:55.435Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2d39fea6d3c19a2f5811d123114d92e3d0115fd1"
},
{
"url": "https://git.kernel.org/stable/c/09cf3dbbb4256a43feb91d2f51f274510a9ada47"
},
{
"url": "https://git.kernel.org/stable/c/cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be"
},
{
"url": "https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901"
},
{
"url": "https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a"
},
{
"url": "https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64"
},
{
"url": "https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9"
},
{
"url": "https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61"
}
],
"title": "ALSA: usb-audio: Clamp frame size in implicit-feedback mode",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74497",
"datePublished": "2026-08-15T12:27:24.494Z",
"dateReserved": "2026-08-15T05:44:03.907Z",
"dateUpdated": "2026-08-19T16:37:55.435Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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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.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- 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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