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

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-11 22:14
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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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        "id": "CVE-2026-31720",
        "lastModified": "2026-06-17T10:34:18.370",
        "metrics": {
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              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/26304d124e7f0383f8fe1168b5801a0ac7e16b1c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6e0e34d85cd46ceb37d16054e97a373a32770f6c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8e5eb1d6e6a3d7bbea9c92132d0cda5793176426"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c6da4fed7537aec19880c24f6c3a95065adb1406"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:25:57+00:00",
      "cve": "CVE-2026-31720",
      "id": "CVE-2026-31720",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: gadget: f_uac1_legacy: validate control request size",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31720.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-01T01:29:46Z",
      "cve": "CVE-2026-31720",
      "id": "CVE-2026-31720",
      "initial_release_date": "2026-05-06T01:43:30Z",
      "product_status:known_affected": "396",
      "product_status:known_not_affected": "324",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31720",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31720.json",
      "version": "9"
    }
  }
}



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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.