Vulnerability-Lookup

FKIE_CVE-2025-39713

Vulnerability from fkie_nvd - Published: 2025-09-05 18:15 - Updated: 2026-10-19 21:10

Severity

4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt() In the interrupt handler rain_interrupt(), the buffer full check on rain->buf_len is performed before acquiring rain->buf_lock. This creates a Time-of-Check to Time-of-Use (TOCTOU) race condition, as rain->buf_len is concurrently accessed and modified in the work handler rain_irq_work_handler() under the same lock. Multiple interrupt invocations can race, with each reading buf_len before it becomes full and then proceeding. This can lead to both interrupts attempting to write to the buffer, incrementing buf_len beyond its capacity (DATA_SIZE) and causing a buffer overflow. Fix this bug by moving the spin_lock() to before the buffer full check. This ensures that the check and the subsequent buffer modification are performed atomically, preventing the race condition. An corresponding spin_unlock() is added to the overflow path to correctly release the lock. This possible bug was found by an experimental static analysis tool developed by our team.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1c2769dc80255824542ea5a4ff1a07dcdeb1603f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2964dbe631fd21ad7873b1752b895548d3c12496	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3c3e33b7edca7a2d6a96801f287f9faeb684d655	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6aaef1a75985865d8c6c5b65fb54152060faba48	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7af160aea26c7dc9e6734d19306128cce156ec40	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ed905fe7cba03cf22ae0b84cf1b73cd1c070423a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fbc81e78d75bf28972bc22b1599559557b1a1b83	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Third Party Advisory
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e	https://cert-portal.siemens.com/productcert/html/ssa-032379.html

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
debian	debian_linux	11.0

JSON

To clipboard

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          "product": "Linux",
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              "status": "unaffected",
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              "versionType": "semver"
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    },
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          ]
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()\n\nIn the interrupt handler rain_interrupt(), the buffer full check on\nrain-\u003ebuf_len is performed before acquiring rain-\u003ebuf_lock. This\ncreates a Time-of-Check to Time-of-Use (TOCTOU) race condition, as\nrain-\u003ebuf_len is concurrently accessed and modified in the work\nhandler rain_irq_work_handler() under the same lock.\n\nMultiple interrupt invocations can race, with each reading buf_len\nbefore it becomes full and then proceeding. This can lead to both\ninterrupts attempting to write to the buffer, incrementing buf_len\nbeyond its capacity (DATA_SIZE) and causing a buffer overflow.\n\nFix this bug by moving the spin_lock() to before the buffer full\ncheck. This ensures that the check and the subsequent buffer modification\nare performed atomically, preventing the race condition. An corresponding\nspin_unlock() is added to the overflow path to correctly release the\nlock.\n\nThis possible bug was found by an experimental static analysis tool\ndeveloped by our team."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmedia: rainshadow-cec: correcci\u00f3n de una condici\u00f3n de carrera TOCTOU en rain_interrupt()\n\nEn el gestor de interrupciones rain_interrupt(), la comprobaci\u00f3n de b\u00fafer lleno en rain-\u003ebuf_len se realiza antes de adquirir rain-\u003ebuf_lock. Esto crea una condici\u00f3n de carrera de Tiempo de Comprobaci\u00f3n a Tiempo de Uso (TOCTOU), ya que rain-\u003ebuf_len es accedido y modificado concurrentemente en el gestor de trabajo rain_irq_work_handler() bajo el mismo bloqueo.\n\nM\u00faltiples invocaciones de interrupci\u00f3n pueden competir, con cada una leyendo buf_len antes de que se llene y luego procediendo. Esto puede llevar a que ambas interrupciones intenten escribir en el b\u00fafer, incrementando buf_len m\u00e1s all\u00e1 de su capacidad (DATA_SIZE) y causando un desbordamiento de b\u00fafer.\n\nSe corrige este error moviendo el spin_lock() a antes de la comprobaci\u00f3n de b\u00fafer lleno. Esto asegura que la comprobaci\u00f3n y la modificaci\u00f3n posterior del b\u00fafer se realicen at\u00f3micamente, previniendo la condici\u00f3n de carrera. Se a\u00f1ade un spin_unlock() correspondiente a la ruta de desbordamiento para liberar correctamente el bloqueo.\n\nEste posible error fue encontrado por una herramienta experimental de an\u00e1lisis est\u00e1tico desarrollada por nuestro equipo."
    }
  ],
  "id": "CVE-2025-39713",
  "lastModified": "2026-10-19T21:10:00.160",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-09-05T18:15:48.720",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/1c2769dc80255824542ea5a4ff1a07dcdeb1603f"
    },
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-39713 (GCVE-0-2025-39713)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-05-12 12:06

Title

media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()

Summary

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7061 records in the last 180 days details

References

11 references

URL	Tags
https://git.kernel.org/stable/c/2964dbe631fd21ad7…
https://git.kernel.org/stable/c/6aaef1a75985865d8…
https://git.kernel.org/stable/c/fbc81e78d75bf2897…
https://git.kernel.org/stable/c/3c3e33b7edca7a2d6…
https://git.kernel.org/stable/c/1c2769dc802558245…
https://git.kernel.org/stable/c/ed905fe7cba03cf22…
https://git.kernel.org/stable/c/ff9dd3db6cd4c6b54…
https://git.kernel.org/stable/c/7af160aea26c7dc9e…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

3 products

Vendor	Product	Version
Linux	Linux	Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < 2964dbe631fd21ad7873b1752b895548d3c12496 (git) Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < 6aaef1a75985865d8c6c5b65fb54152060faba48 (git) Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < fbc81e78d75bf28972bc22b1599559557b1a1b83 (git) Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < 3c3e33b7edca7a2d6a96801f287f9faeb684d655 (git) Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < 1c2769dc80255824542ea5a4ff1a07dcdeb1603f (git) Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < ed905fe7cba03cf22ae0b84cf1b73cd1c070423a (git) Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59 (git) Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < 7af160aea26c7dc9e6734d19306128cce156ec40 (git)
Linux	Linux	Affected: 4.12 Unaffected: 0 , < 4.12 (semver) Unaffected: 5.4.297 , ≤ 5.4.* (semver) Unaffected: 5.10.241 , ≤ 5.10.* (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.149 , ≤ 6.1.* (semver) Unaffected: 6.6.103 , ≤ 6.6.* (semver) Unaffected: 6.12.44 , ≤ 6.12.* (semver) Unaffected: 6.16.4 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC CN 4100	Affected: 0 , < V5.0 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:42:39.229Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "affected": [
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC CN 4100",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "V5.0",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-12T12:06:30.232Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
          }
        ],
        "x_adpType": "supplier"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/cec/usb/rainshadow/rainshadow-cec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2964dbe631fd21ad7873b1752b895548d3c12496",
              "status": "affected",
              "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac",
              "versionType": "git"
            },
            {
              "lessThan": "6aaef1a75985865d8c6c5b65fb54152060faba48",
              "status": "affected",
              "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac",
              "versionType": "git"
            },
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              "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac",
              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
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              "versionType": "git"
            },
            {
              "lessThan": "7af160aea26c7dc9e6734d19306128cce156ec40",
              "status": "affected",
              "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/cec/usb/rainshadow/rainshadow-cec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.12"
            },
            {
              "lessThan": "4.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.297",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.241",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.190",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.149",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.297",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.241",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.190",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.149",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.103",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.44",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.4",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()\n\nIn the interrupt handler rain_interrupt(), the buffer full check on\nrain-\u003ebuf_len is performed before acquiring rain-\u003ebuf_lock. This\ncreates a Time-of-Check to Time-of-Use (TOCTOU) race condition, as\nrain-\u003ebuf_len is concurrently accessed and modified in the work\nhandler rain_irq_work_handler() under the same lock.\n\nMultiple interrupt invocations can race, with each reading buf_len\nbefore it becomes full and then proceeding. This can lead to both\ninterrupts attempting to write to the buffer, incrementing buf_len\nbeyond its capacity (DATA_SIZE) and causing a buffer overflow.\n\nFix this bug by moving the spin_lock() to before the buffer full\ncheck. This ensures that the check and the subsequent buffer modification\nare performed atomically, preventing the race condition. An corresponding\nspin_unlock() is added to the overflow path to correctly release the\nlock.\n\nThis possible bug was found by an experimental static analysis tool\ndeveloped by our team."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:34:49.278Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2964dbe631fd21ad7873b1752b895548d3c12496"
        },
        {
          "url": "https://git.kernel.org/stable/c/6aaef1a75985865d8c6c5b65fb54152060faba48"
        },
        {
          "url": "https://git.kernel.org/stable/c/fbc81e78d75bf28972bc22b1599559557b1a1b83"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c3e33b7edca7a2d6a96801f287f9faeb684d655"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c2769dc80255824542ea5a4ff1a07dcdeb1603f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed905fe7cba03cf22ae0b84cf1b73cd1c070423a"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59"
        },
        {
          "url": "https://git.kernel.org/stable/c/7af160aea26c7dc9e6734d19306128cce156ec40"
        }
      ],
      "title": "media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39713",
    "datePublished": "2025-09-05T17:21:20.459Z",
    "dateReserved": "2025-04-16T07:20:57.116Z",
    "dateUpdated": "2026-05-12T12:06:30.232Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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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.

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