CVE-2025-21835 (GCVE-0-2025-21835)

Vulnerability from cvelistv5 – Published: 2025-03-07 09:09 – Updated: 2026-10-15 01:04
VLAI
Title
usb: gadget: f_midi: fix MIDI Streaming descriptor lengths
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi: fix MIDI Streaming descriptor lengths While the MIDI jacks are configured correctly, and the MIDIStreaming endpoint descriptors are filled with the correct information, bNumEmbMIDIJack and bLength are set incorrectly in these descriptors. This does not matter when the numbers of in and out ports are equal, but when they differ the host will receive broken descriptors with uninitialized stack memory leaking into the descriptor for whichever value is smaller. The precise meaning of "in" and "out" in the port counts is not clearly defined and can be confusing. But elsewhere the driver consistently uses this to match the USB meaning of IN and OUT viewed from the host, so that "in" ports send data to the host and "out" ports receive data from it.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c8933c3f79568263c90a46f06cf80419e6c63c97 , < 3a983390d14e8498f303fc5cb23ab7d696b815db (git)
Affected: c8933c3f79568263c90a46f06cf80419e6c63c97 , < 9f36a89dcb78cb7e37f487b04a16396ac18c0636 (git)
Affected: c8933c3f79568263c90a46f06cf80419e6c63c97 , < d8e86700c8a8cf415e300a0921acd6a8f9b494f8 (git)
Affected: c8933c3f79568263c90a46f06cf80419e6c63c97 , < 9f6860a9c11301b052225ca8825f8d2b1a5825bf (git)
Affected: c8933c3f79568263c90a46f06cf80419e6c63c97 , < 6ae6dee9f005a2f3b739b85abb6f14a0935699e0 (git)
Affected: c8933c3f79568263c90a46f06cf80419e6c63c97 , < 6b16761a928796e4b49e89a0b1ac284155172726 (git)
Affected: c8933c3f79568263c90a46f06cf80419e6c63c97 , < a2d0694e1f111379c1efdf439dadd3cfd959fe9d (git)
Affected: c8933c3f79568263c90a46f06cf80419e6c63c97 , < da1668997052ed1cb00322e1f3b63702615c9429 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.129 , ≤ 6.1.* (semver)
Unaffected: 6.6.79 , ≤ 6.6.* (semver)
Unaffected: 6.12.16 , ≤ 6.12.* (semver)
Unaffected: 6.13.4 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_midi: fix MIDI Streaming descriptor lengths\n\nWhile the MIDI jacks are configured correctly, and the MIDIStreaming\nendpoint descriptors are filled with the correct information,\nbNumEmbMIDIJack and bLength are set incorrectly in these descriptors.\n\nThis does not matter when the numbers of in and out ports are equal, but\nwhen they differ the host will receive broken descriptors with\nuninitialized stack memory leaking into the descriptor for whichever\nvalue is smaller.\n\nThe precise meaning of \"in\" and \"out\" in the port counts is not clearly\ndefined and can be confusing.  But elsewhere the driver consistently\nuses this to match the USB meaning of IN and OUT viewed from the host,\nso that \"in\" ports send data to the host and \"out\" ports receive data\nfrom it."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: gadget: f_midi: fix MIDI Streaming descriptor lengths Mientras que los conectores MIDI est\u00e1n configurados correctamente, y los descriptores de endpoint MIDIStreaming est\u00e1n llenos con la informaci\u00f3n correcta, bNumEmbMIDIJack y bLength est\u00e1n configurados incorrectamente en estos descriptores. Esto no importa cuando los n\u00fameros de puertos de entrada y salida son iguales, pero cuando difieren, el host recibir\u00e1 descriptores rotos con memoria de pila no inicializada que se filtra en el descriptor para el valor que sea menor. El significado preciso de \"entrada\" y \"salida\" en los recuentos de puertos no est\u00e1 claramente definido y puede ser confuso. Pero en otros lugares, el controlador usa esto constantemente para que coincida con el significado USB de IN y OUT visto desde el host, de modo que los puertos \"de entrada\" env\u00edan datos al host y los puertos \"de salida\" reciben datos de \u00e9l."
          }
        ],
        "id": "CVE-2025-21835",
        "lastModified": "2026-10-15T02:17:37.637",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-03-07T09:15:16.473",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3a983390d14e8498f303fc5cb23ab7d696b815db"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6ae6dee9f005a2f3b739b85abb6f14a0935699e0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6b16761a928796e4b49e89a0b1ac284155172726"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9f36a89dcb78cb7e37f487b04a16396ac18c0636"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9f6860a9c11301b052225ca8825f8d2b1a5825bf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a2d0694e1f111379c1efdf439dadd3cfd959fe9d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d8e86700c8a8cf415e300a0921acd6a8f9b494f8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/da1668997052ed1cb00322e1f3b63702615c9429"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-11-06T14:44:47+00:00",
      "cve": "CVE-2025-21835",
      "id": "CVE-2025-21835",
      "initial_release_date": "2025-03-07T00:00:00+00:00",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: gadget: f_midi: fix MIDI Streaming descriptor lengths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21835.json",
      "version": "3"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • 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.
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  • 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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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