CVE-2025-68339 (GCVE-0-2025-68339)

Vulnerability from cvelistv5 – Published: 2025-12-23 13:58 – Updated: 2026-05-11 21:51
VLAI
Title
atm/fore200e: Fix possible data race in fore200e_open()
Summary
In the Linux kernel, the following vulnerability has been resolved: atm/fore200e: Fix possible data race in fore200e_open() Protect access to fore200e->available_cell_rate with rate_mtx lock in the error handling path of fore200e_open() to prevent a data race. The field fore200e->available_cell_rate is a shared resource used to track available bandwidth. It is concurrently accessed by fore200e_open(), fore200e_close(), and fore200e_change_qos(). In fore200e_open(), the lock rate_mtx is correctly held when subtracting vcc->qos.txtp.max_pcr from available_cell_rate to reserve bandwidth. However, if the subsequent call to fore200e_activate_vcin() fails, the function restores the reserved bandwidth by adding back to available_cell_rate without holding the lock. This introduces a race condition because available_cell_rate is a global device resource shared across all VCCs. If the error path in fore200e_open() executes concurrently with operations like fore200e_close() or fore200e_change_qos() on other VCCs, a read-modify-write race occurs. Specifically, the error path reads the rate without the lock. If another CPU acquires the lock and modifies the rate (e.g., releasing bandwidth in fore200e_close()) between this read and the subsequent write, the error path will overwrite the concurrent update with a stale value. This results in incorrect bandwidth accounting.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1b60f42a639999c37da7f1fbfa1ad29cf4cbdd2d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bd1415efbab507b9b995918105eef953013449dd (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ed34c70d88e2b8b9bc6c3ede88751186d6c6d5d1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9917ba597cf95f307778e495f71ff25a5064d167 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 667ac868823224374f819500adc5baa2889c7bc5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6610361458e7eb6502dd3182f586f91fcc218039 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 82fca3d8a4a34667f01ec2351a607135249c9cff (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.119 , ≤ 6.6.* (semver)
Unaffected: 6.12.61 , ≤ 6.12.* (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\natm/fore200e: Fix possible data race in fore200e_open()\n\nProtect access to fore200e-\u003eavailable_cell_rate with rate_mtx lock in the\nerror handling path of fore200e_open() to prevent a data race.\n\nThe field fore200e-\u003eavailable_cell_rate is a shared resource used to track\navailable bandwidth. It is concurrently accessed by fore200e_open(),\nfore200e_close(), and fore200e_change_qos().\n\nIn fore200e_open(), the lock rate_mtx is correctly held when subtracting\nvcc-\u003eqos.txtp.max_pcr from available_cell_rate to reserve bandwidth.\nHowever, if the subsequent call to fore200e_activate_vcin() fails, the\nfunction restores the reserved bandwidth by adding back to\navailable_cell_rate without holding the lock.\n\nThis introduces a race condition because available_cell_rate is a global\ndevice resource shared across all VCCs. If the error path in\nfore200e_open() executes concurrently with operations like\nfore200e_close() or fore200e_change_qos() on other VCCs, a\nread-modify-write race occurs.\n\nSpecifically, the error path reads the rate without the lock. If another\nCPU acquires the lock and modifies the rate (e.g., releasing bandwidth in\nfore200e_close()) between this read and the subsequent write, the error\npath will overwrite the concurrent update with a stale value. This results\nin incorrect bandwidth accounting."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:51:16.850Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/1b60f42a639999c37da7f1fbfa1ad29cf4cbdd2d"
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          "url": "https://git.kernel.org/stable/c/bd1415efbab507b9b995918105eef953013449dd"
        },
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          "url": "https://git.kernel.org/stable/c/ed34c70d88e2b8b9bc6c3ede88751186d6c6d5d1"
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          "url": "https://git.kernel.org/stable/c/9917ba597cf95f307778e495f71ff25a5064d167"
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          "url": "https://git.kernel.org/stable/c/82fca3d8a4a34667f01ec2351a607135249c9cff"
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    "cveId": "CVE-2025-68339",
    "datePublished": "2025-12-23T13:58:24.955Z",
    "dateReserved": "2025-12-16T14:48:05.297Z",
    "dateUpdated": "2026-05-11T21:51:16.850Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\natm/fore200e: Fix possible data race in fore200e_open()\n\nProtect access to fore200e-\u003eavailable_cell_rate with rate_mtx lock in the\nerror handling path of fore200e_open() to prevent a data race.\n\nThe field fore200e-\u003eavailable_cell_rate is a shared resource used to track\navailable bandwidth. It is concurrently accessed by fore200e_open(),\nfore200e_close(), and fore200e_change_qos().\n\nIn fore200e_open(), the lock rate_mtx is correctly held when subtracting\nvcc-\u003eqos.txtp.max_pcr from available_cell_rate to reserve bandwidth.\nHowever, if the subsequent call to fore200e_activate_vcin() fails, the\nfunction restores the reserved bandwidth by adding back to\navailable_cell_rate without holding the lock.\n\nThis introduces a race condition because available_cell_rate is a global\ndevice resource shared across all VCCs. If the error path in\nfore200e_open() executes concurrently with operations like\nfore200e_close() or fore200e_change_qos() on other VCCs, a\nread-modify-write race occurs.\n\nSpecifically, the error path reads the rate without the lock. If another\nCPU acquires the lock and modifies the rate (e.g., releasing bandwidth in\nfore200e_close()) between this read and the subsequent write, the error\npath will overwrite the concurrent update with a stale value. This results\nin incorrect bandwidth accounting."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha corregido la siguiente vulnerabilidad:\\n\\natm/fore200e: Corrige una posible condici\u00f3n de carrera de datos en fore200e_open()\\n\\nProtege el acceso a fore200e -\u003e available_cell_rate con el bloqueo rate_mtx en la ruta de manejo de errores de fore200e_open() para evitar una condici\u00f3n de carrera de datos.\\n\\nEl campo fore200e -\u003e available_cell_rate es un recurso compartido utilizado para rastrear el ancho de banda disponible. Es accedido concurrentemente por fore200e_open(), fore200e_close() y fore200e_change_qos().\\n\\nEn fore200e_open(), el bloqueo rate_mtx se mantiene correctamente al restar vcc -\u003e qos.txtp.max_pcr de available_cell_rate para reservar ancho de banda. Sin embargo, si la llamada posterior a fore200e_activate_vcin() falla, la funci\u00f3n restaura el ancho de banda reservado a\u00f1adiendo de nuevo a available_cell_rate sin mantener el bloqueo.\\n\\nEsto introduce una condici\u00f3n de carrera porque available_cell_rate es un recurso global del dispositivo compartido entre todos los VCC. Si la ruta de error en fore200e_open() se ejecuta concurrentemente con operaciones como fore200e_close() o fore200e_change_qos() en otros VCC, se produce una condici\u00f3n de carrera de lectura-modificaci\u00f3n-escritura.\\n\\nEspec\u00edficamente, la ruta de error lee la tasa sin el bloqueo. Si otra CPU adquiere el bloqueo y modifica la tasa (por ejemplo, liberando ancho de banda en fore200e_close()) entre esta lectura y la escritura posterior, la ruta de error sobrescribir\u00e1 la actualizaci\u00f3n concurrente con un valor obsoleto. Esto resulta en una contabilidad de ancho de banda incorrecta."
          }
        ],
        "id": "CVE-2025-68339",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-12-23T14:16:40.477",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "url": "https://git.kernel.org/stable/c/82fca3d8a4a34667f01ec2351a607135249c9cff"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9917ba597cf95f307778e495f71ff25a5064d167"
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            "url": "https://git.kernel.org/stable/c/bd1415efbab507b9b995918105eef953013449dd"
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            "url": "https://git.kernel.org/stable/c/ed34c70d88e2b8b9bc6c3ede88751186d6c6d5d1"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:15:57+00:00",
      "cve": "CVE-2025-68339",
      "id": "CVE-2025-68339",
      "initial_release_date": "2025-12-23T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: atm/fore200e: Fix possible data race in fore200e_open()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68339.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-15T15:56:06Z",
      "cve": "CVE-2025-68339",
      "id": "CVE-2025-68339",
      "initial_release_date": "2025-12-24T00:24:07Z",
      "product_status:known_affected": "396",
      "product_status:known_not_affected": "457",
      "product_status:recommended": "415",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68339",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-68339.json",
      "version": "42"
    }
  }
}



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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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

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