CVE-2026-74682 (GCVE-0-2026-74682)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-22 15:32
VLAI
Title
ALSA: usb-audio: fix OOB write on Type II inbound URBs
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix OOB write on Type II inbound URBs data_ep_set_params() sizes each URB transfer buffer before it adds the Format Type II transfer delimiter: u->packets = urb_packs; u->buffer_size = maxsize * u->packets; if (fmt->fmt_type == UAC_FORMAT_TYPE_II) u->packets++; /* for transfer delimiter */ u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); buffer_size is computed from the pre-increment packet count and never recomputed, so for a Type II endpoint the buffer is one packet short of the packet count the URB is built with. prepare_inbound_urb() then lays out one iso frame per packet and never consults buffer_size: offs = 0; for (i = 0; i < urb_ctx->packets; i++) { urb->iso_frame_desc[i].offset = offs; urb->iso_frame_desc[i].length = ep->curpacksize; offs += ep->curpacksize; } urb->transfer_buffer_length = offs; urb->number_of_packets = urb_ctx->packets; The last descriptor therefore points one packet past the end of the transfer buffer, where the host controller writes device data on every inbound transfer. prepare_silent_urb() and prepare_playback_urb() bound their fill loops by ctx->buffer_size, so only capture is affected. fmt_type comes from the device's audio streaming descriptors, so any device advertising a Type II capture format hits this once userspace sets hw_params on the stream. KASAN on 7.2.0-rc5 (arm64) with a dummy_hcd/raw-gadget device, one report per inbound transfer: BUG: KASAN: slab-out-of-bounds in dummy_timer Write of size 64 at addr ffff0000186171c0 by task cons02/166 __asan_memcpy dummy_timer hrtimer_run_softirq Allocated by task 166: usb_alloc_coherent snd_usb_endpoint_set_params The buggy address is located 0 bytes to the right of allocated 64-byte region [ffff000018617180, ffff0000186171c0) Compute buffer_size after the delimiter packet has been accounted for, and bound the fill loop by buffer_size, as prepare_silent_urb() already does on the outbound side. This grows every Type II URB allocation by one maxsize packet. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8fdff6a319e7dac757c558bd283dc4577e68cde7 , < 6af5f29af7711233ae68d3b25c15d67478468900 (git)
Affected: 8fdff6a319e7dac757c558bd283dc4577e68cde7 , < f1fbb50b99311b35c2e85cc70341d62082dca4b5 (git)
Affected: 8fdff6a319e7dac757c558bd283dc4577e68cde7 , < 137bf034740e5a2734794908d0aff1e0bd7cee6e (git)
Affected: 8fdff6a319e7dac757c558bd283dc4577e68cde7 , < 6607f85242577f33d4540a0d1f4a6137f5367058 (git)
Affected: 8fdff6a319e7dac757c558bd283dc4577e68cde7 , < ca22c94bdfc22c564ca2e11c87ba4d17ebeaaa9a (git)
Affected: 8fdff6a319e7dac757c558bd283dc4577e68cde7 , < 0a235379825e1a6194e43861ee6658e5fc35686d (git)
Affected: 8fdff6a319e7dac757c558bd283dc4577e68cde7 , < d3ed4e6321bb453757044cb9e5ecb30a33f04903 (git)
Affected: 8fdff6a319e7dac757c558bd283dc4577e68cde7 , < 69ee44e1a23be62318189dc4b37fa4ad94053269 (git)
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Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
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              "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"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
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            {
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              "status": "unaffected",
              "version": "7.1.9",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
            }
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix OOB write on Type II inbound URBs\n\ndata_ep_set_params() sizes each URB transfer buffer before it adds the\nFormat Type II transfer delimiter:\n\n\tu-\u003epackets = urb_packs;\n\tu-\u003ebuffer_size = maxsize * u-\u003epackets;\n\n\tif (fmt-\u003efmt_type == UAC_FORMAT_TYPE_II)\n\t\tu-\u003epackets++; /* for transfer delimiter */\n\tu-\u003eurb = usb_alloc_urb(u-\u003epackets, GFP_KERNEL);\n\nbuffer_size is computed from the pre-increment packet count and never\nrecomputed, so for a Type II endpoint the buffer is one packet short of\nthe packet count the URB is built with.\n\nprepare_inbound_urb() then lays out one iso frame per packet and never\nconsults buffer_size:\n\n\toffs = 0;\n\tfor (i = 0; i \u003c urb_ctx-\u003epackets; i++) {\n\t\turb-\u003eiso_frame_desc[i].offset = offs;\n\t\turb-\u003eiso_frame_desc[i].length = ep-\u003ecurpacksize;\n\t\toffs += ep-\u003ecurpacksize;\n\t}\n\n\turb-\u003etransfer_buffer_length = offs;\n\turb-\u003enumber_of_packets = urb_ctx-\u003epackets;\n\nThe last descriptor therefore points one packet past the end of the\ntransfer buffer, where the host controller writes device data on every\ninbound transfer.  prepare_silent_urb() and prepare_playback_urb() bound\ntheir fill loops by ctx-\u003ebuffer_size, so only capture is affected.\n\nfmt_type comes from the device\u0027s audio streaming descriptors, so any\ndevice advertising a Type II capture format hits this once userspace sets\nhw_params on the stream.\n\nKASAN on 7.2.0-rc5 (arm64) with a dummy_hcd/raw-gadget device, one report\nper inbound transfer:\n\n  BUG: KASAN: slab-out-of-bounds in dummy_timer\n  Write of size 64 at addr ffff0000186171c0 by task cons02/166\n   __asan_memcpy\n   dummy_timer\n   hrtimer_run_softirq\n  Allocated by task 166:\n   usb_alloc_coherent\n   snd_usb_endpoint_set_params\n  The buggy address is located 0 bytes to the right of\n   allocated 64-byte region [ffff000018617180, ffff0000186171c0)\n\nCompute buffer_size after the delimiter packet has been accounted for,\nand bound the fill loop by buffer_size, as prepare_silent_urb() already\ndoes on the outbound side.  This grows every Type II URB allocation by\none maxsize packet.\n\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:32:49.527Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6af5f29af7711233ae68d3b25c15d67478468900"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1fbb50b99311b35c2e85cc70341d62082dca4b5"
        },
        {
          "url": "https://git.kernel.org/stable/c/137bf034740e5a2734794908d0aff1e0bd7cee6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/6607f85242577f33d4540a0d1f4a6137f5367058"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca22c94bdfc22c564ca2e11c87ba4d17ebeaaa9a"
        },
        {
          "url": "https://git.kernel.org/stable/c/0a235379825e1a6194e43861ee6658e5fc35686d"
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        {
          "url": "https://git.kernel.org/stable/c/d3ed4e6321bb453757044cb9e5ecb30a33f04903"
        },
        {
          "url": "https://git.kernel.org/stable/c/69ee44e1a23be62318189dc4b37fa4ad94053269"
        }
      ],
      "title": "ALSA: usb-audio: fix OOB write on Type II inbound URBs",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74682",
    "datePublished": "2026-08-22T15:32:49.527Z",
    "dateReserved": "2026-08-15T05:44:03.925Z",
    "dateUpdated": "2026-08-22T15:32:49.527Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74682",
      "date": "2026-08-29",
      "epss": "0.00177",
      "percentile": "0.07272"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-24T14:52:00.000Z",
      "cve": "CVE-2026-74682",
      "id": "msrc_CVE-2026-74682",
      "initial_release_date": "2026-08-24T01:09:18.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ALSA: usb-audio: fix OOB write on Type II inbound URBs",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74682.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74682\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:42.480\",\"lastModified\":\"2026-08-22T16:16:42.480\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nALSA: usb-audio: fix OOB write on Type II inbound URBs\\n\\ndata_ep_set_params() sizes each URB transfer buffer before it adds the\\nFormat Type II transfer delimiter:\\n\\n\\tu-\u003epackets = urb_packs;\\n\\tu-\u003ebuffer_size = maxsize * u-\u003epackets;\\n\\n\\tif (fmt-\u003efmt_type == UAC_FORMAT_TYPE_II)\\n\\t\\tu-\u003epackets++; /* for transfer delimiter */\\n\\tu-\u003eurb = usb_alloc_urb(u-\u003epackets, GFP_KERNEL);\\n\\nbuffer_size is computed from the pre-increment packet count and never\\nrecomputed, so for a Type II endpoint the buffer is one packet short of\\nthe packet count the URB is built with.\\n\\nprepare_inbound_urb() then lays out one iso frame per packet and never\\nconsults buffer_size:\\n\\n\\toffs = 0;\\n\\tfor (i = 0; i \u003c urb_ctx-\u003epackets; i++) {\\n\\t\\turb-\u003eiso_frame_desc[i].offset = offs;\\n\\t\\turb-\u003eiso_frame_desc[i].length = ep-\u003ecurpacksize;\\n\\t\\toffs += ep-\u003ecurpacksize;\\n\\t}\\n\\n\\turb-\u003etransfer_buffer_length = offs;\\n\\turb-\u003enumber_of_packets = urb_ctx-\u003epackets;\\n\\nThe last descriptor therefore points one packet past the end of the\\ntransfer buffer, where the host controller writes device data on every\\ninbound transfer.  prepare_silent_urb() and prepare_playback_urb() bound\\ntheir fill loops by ctx-\u003ebuffer_size, so only capture is affected.\\n\\nfmt_type comes from the device\u0027s audio streaming descriptors, so any\\ndevice advertising a Type II capture format hits this once userspace sets\\nhw_params on the stream.\\n\\nKASAN on 7.2.0-rc5 (arm64) with a dummy_hcd/raw-gadget device, one report\\nper inbound transfer:\\n\\n  BUG: KASAN: slab-out-of-bounds in dummy_timer\\n  Write of size 64 at addr ffff0000186171c0 by task cons02/166\\n   __asan_memcpy\\n   dummy_timer\\n   hrtimer_run_softirq\\n  Allocated by task 166:\\n   usb_alloc_coherent\\n   snd_usb_endpoint_set_params\\n  The buggy address is located 0 bytes to the right of\\n   allocated 64-byte region [ffff000018617180, ffff0000186171c0)\\n\\nCompute buffer_size after the delimiter packet has been accounted for,\\nand bound the fill loop by buffer_size, as prepare_silent_urb() already\\ndoes on the outbound side.  This grows every Type II URB allocation by\\none maxsize packet.\\n\\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e\"}],\"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\":\"8fdff6a319e7dac757c558bd283dc4577e68cde7\",\"lessThan\":\"6af5f29af7711233ae68d3b25c15d67478468900\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8fdff6a319e7dac757c558bd283dc4577e68cde7\",\"lessThan\":\"f1fbb50b99311b35c2e85cc70341d62082dca4b5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8fdff6a319e7dac757c558bd283dc4577e68cde7\",\"lessThan\":\"137bf034740e5a2734794908d0aff1e0bd7cee6e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8fdff6a319e7dac757c558bd283dc4577e68cde7\",\"lessThan\":\"6607f85242577f33d4540a0d1f4a6137f5367058\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8fdff6a319e7dac757c558bd283dc4577e68cde7\",\"lessThan\":\"ca22c94bdfc22c564ca2e11c87ba4d17ebeaaa9a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8fdff6a319e7dac757c558bd283dc4577e68cde7\",\"lessThan\":\"0a235379825e1a6194e43861ee6658e5fc35686d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8fdff6a319e7dac757c558bd283dc4577e68cde7\",\"lessThan\":\"d3ed4e6321bb453757044cb9e5ecb30a33f04903\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8fdff6a319e7dac757c558bd283dc4577e68cde7\",\"lessThan\":\"69ee44e1a23be62318189dc4b37fa4ad94053269\",\"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\":\"3.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.5\",\"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\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a235379825e1a6194e43861ee6658e5fc35686d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/137bf034740e5a2734794908d0aff1e0bd7cee6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6607f85242577f33d4540a0d1f4a6137f5367058\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/69ee44e1a23be62318189dc4b37fa4ad94053269\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6af5f29af7711233ae68d3b25c15d67478468900\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ca22c94bdfc22c564ca2e11c87ba4d17ebeaaa9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d3ed4e6321bb453757044cb9e5ecb30a33f04903\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1fbb50b99311b35c2e85cc70341d62082dca4b5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-24T17:07:42+00:00",
      "cve": "CVE-2026-74682",
      "id": "CVE-2026-74682",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: usb-audio: fix OOB write on Type II inbound URBs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74682.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.