CVE-2026-31720 (GCVE-0-2026-31720)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-02 06:14
VLAI?
Title
usb: gadget: f_uac1_legacy: validate control request size
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_uac1_legacy: validate control request size f_audio_complete() copies req->length bytes into a 4-byte stack variable: u32 data = 0; memcpy(&data, req->buf, req->length); req->length is derived from the host-controlled USB request path, which can lead to a stack out-of-bounds write. Validate req->actual against the expected payload size for the supported control selectors and decode only the expected amount of data. This avoids copying a host-influenced length into a fixed-size stack object.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c6994e6f067cf0fc4c6cca3d164018b1150916f8 , < 557d1d4e862eccd0b74cc377b66de3e1e8d49605 (git)
Affected: c6994e6f067cf0fc4c6cca3d164018b1150916f8 , < 21b11e8581285c6f10ef43d05df349d445f24273 (git)
Affected: c6994e6f067cf0fc4c6cca3d164018b1150916f8 , < 0d41772d98dcaf6c17e875b7d0ea0154ae1191ee (git)
Affected: c6994e6f067cf0fc4c6cca3d164018b1150916f8 , < c6da4fed7537aec19880c24f6c3a95065adb1406 (git)
Affected: c6994e6f067cf0fc4c6cca3d164018b1150916f8 , < be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8 (git)
Affected: c6994e6f067cf0fc4c6cca3d164018b1150916f8 , < 8e5eb1d6e6a3d7bbea9c92132d0cda5793176426 (git)
Affected: c6994e6f067cf0fc4c6cca3d164018b1150916f8 , < 26304d124e7f0383f8fe1168b5801a0ac7e16b1c (git)
Affected: c6994e6f067cf0fc4c6cca3d164018b1150916f8 , < 6e0e34d85cd46ceb37d16054e97a373a32770f6c (git)
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    Linux Linux Affected: 2.6.31
Unaffected: 0 , < 2.6.31 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_uac1_legacy.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "2.6.31"
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
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              "status": "unaffected",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.12.81",
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate control request size\n\nf_audio_complete() copies req-\u003elength bytes into a 4-byte stack\nvariable:\n\n  u32 data = 0;\n  memcpy(\u0026data, req-\u003ebuf, req-\u003elength);\n\nreq-\u003elength is derived from the host-controlled USB request path,\nwhich can lead to a stack out-of-bounds write.\n\nValidate req-\u003eactual against the expected payload size for the\nsupported control selectors and decode only the expected amount\nof data.\n\nThis avoids copying a host-influenced length into a fixed-size\nstack object."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-02T06:14:21.352Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31720",
    "datePublished": "2026-05-01T14:14:22.832Z",
    "dateReserved": "2026-03-09T15:48:24.134Z",
    "dateUpdated": "2026-05-02T06:14:21.352Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-05-05",
      "epss": "0.00024",
      "percentile": "0.06806"
    },
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  }
}


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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

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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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