{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-68339",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-68339"
  ],
  "published": "2025-12-23T13:58:46Z",
  "summary": "atm/fore200e: Fix possible data race in fore200e_open()",
  "details": "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->available_cell_rate with rate_mtx lock in the\nerror handling path of fore200e_open() to prevent a data race.\n\nThe field fore200e->available_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->qos.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.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.159",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-68339"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1b60f42a639999c37da7f1fbfa1ad29cf4cbdd2d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bd1415efbab507b9b995918105eef953013449dd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ed34c70d88e2b8b9bc6c3ede88751186d6c6d5d1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9917ba597cf95f307778e495f71ff25a5064d167"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/667ac868823224374f819500adc5baa2889c7bc5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6610361458e7eb6502dd3182f586f91fcc218039"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/82fca3d8a4a34667f01ec2351a607135249c9cff"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}