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

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
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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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          "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."
        }
      ],
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            "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"
          },
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              "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."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2026-08-15T05:44:03.907Z",
    "dateUpdated": "2026-08-19T16:37:55.435Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74497",
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      "source": "Microsoft CSAF VEX",
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      "title": "ALSA: usb-audio: Clamp frame size in implicit-feedback mode",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74497.json",
      "version": "1"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"sound/usb/endpoint.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"28acb12014fb0c3e1edfdab1b1e3e266cf651550\",\"lessThan\":\"2d39fea6d3c19a2f5811d123114d92e3d0115fd1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"28acb12014fb0c3e1edfdab1b1e3e266cf651550\",\"lessThan\":\"09cf3dbbb4256a43feb91d2f51f274510a9ada47\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"28acb12014fb0c3e1edfdab1b1e3e266cf651550\",\"lessThan\":\"cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"28acb12014fb0c3e1edfdab1b1e3e266cf651550\",\"lessThan\":\"56ac3e7c90f6b45969c3fd07a98fad760ffd6901\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"28acb12014fb0c3e1edfdab1b1e3e266cf651550\",\"lessThan\":\"be97fea7451d758881b95af78e900dd0d58a382a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"28acb12014fb0c3e1edfdab1b1e3e266cf651550\",\"lessThan\":\"2db4535d6af79276a64449201c5be5feffb31c64\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"28acb12014fb0c3e1edfdab1b1e3e266cf651550\",\"lessThan\":\"53f0aa37eb945f3c983f61d12fc35eb33debb8a9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"28acb12014fb0c3e1edfdab1b1e3e266cf651550\",\"lessThan\":\"8d7a30c50c2e58a6839634ed0acde14466d1dc61\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"sound/usb/endpoint.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/09cf3dbbb4256a43feb91d2f51f274510a9ada47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2d39fea6d3c19a2f5811d123114d92e3d0115fd1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:41:52+00:00",
      "cve": "CVE-2026-74497",
      "id": "CVE-2026-74497",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: usb-audio: Clamp frame size in implicit-feedback mode",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74497.json",
      "version": "3"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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