Vulnerability-Lookup

GHSA-56RG-F4QQ-GHHV

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32

Details

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.

Severity

8.4 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74497"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:54Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-56rg-f4qq-ghhv",
  "modified": "2026-08-19T18:32:28Z",
  "published": "2026-08-15T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74497"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09cf3dbbb4256a43feb91d2f51f274510a9ada47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d39fea6d3c19a2f5811d123114d92e3d0115fd1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74497 (GCVE-0-2026-74497)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37

Title

ALSA: usb-audio: Clamp frame size in implicit-feedback mode

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.

Severity

8.4 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/2d39fea6d3c19a2f5…
https://git.kernel.org/stable/c/09cf3dbbb4256a43f…
https://git.kernel.org/stable/c/cfa8d3e0e8b812c4d…
https://git.kernel.org/stable/c/56ac3e7c90f6b4596…
https://git.kernel.org/stable/c/be97fea7451d75888…
https://git.kernel.org/stable/c/2db4535d6af79276a…
https://git.kernel.org/stable/c/53f0aa37eb945f3c9…
https://git.kernel.org/stable/c/8d7a30c50c2e58a68…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 , < 2d39fea6d3c19a2f5811d123114d92e3d0115fd1 (git) Affected: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 , < 09cf3dbbb4256a43feb91d2f51f274510a9ada47 (git) Affected: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 , < cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be (git) Affected: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 , < 56ac3e7c90f6b45969c3fd07a98fad760ffd6901 (git) Affected: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 , < be97fea7451d758881b95af78e900dd0d58a382a (git) Affected: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 , < 2db4535d6af79276a64449201c5be5feffb31c64 (git) Affected: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 , < 53f0aa37eb945f3c983f61d12fc35eb33debb8a9 (git) Affected: 28acb12014fb0c3e1edfdab1b1e3e266cf651550 , < 8d7a30c50c2e58a6839634ed0acde14466d1dc61 (git)
Linux	Linux	Affected: 3.8 Unaffected: 0 , < 3.8 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/endpoint.c"
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            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
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              "status": "unaffected",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
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          "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."
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            "baseSeverity": "HIGH",
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              "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."
            }
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      ],
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        "dateUpdated": "2026-08-19T16:37:55.435Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61"
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      "title": "ALSA: usb-audio: Clamp frame size in implicit-feedback mode",
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    "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"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

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.

Related by attack behaviour

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