{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31576",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-31576"
  ],
  "published": "2026-04-24T14:43:40Z",
  "summary": "media: hackrf: fix to not free memory after the device is registered in hackrf_probe()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: hackrf: fix to not free memory after the device is registered in hackrf_probe()\n\nIn hackrf driver, the following race condition occurs:\n```\n\t\tCPU0\t\t\t\t\t\tCPU1\nhackrf_probe()\n  kzalloc(); // alloc hackrf_dev\n  ....\n  v4l2_device_register();\n  ....\n\t\t\t\t\t\tfd = sys_open(\"/path/to/dev\"); // open hackrf fd\n\t\t\t\t\t\t....\n  v4l2_device_unregister();\n  ....\n  kfree(); // free hackrf_dev\n  ....\n\t\t\t\t\t\tsys_ioctl(fd, ...);\n\t\t\t\t\t\t  v4l2_ioctl();\n\t\t\t\t\t\t    video_is_registered() // UAF!!\n\t\t\t\t\t\t....\n\t\t\t\t\t\tsys_close(fd);\n\t\t\t\t\t\t  v4l2_release() // UAF!!\n\t\t\t\t\t\t    hackrf_video_release()\n\t\t\t\t\t\t      kfree(); // DFB!!\n```\n\nWhen a V4L2 or video device is unregistered, the device node is removed so\nnew open() calls are blocked.\n\nHowever, file descriptors that are already open-and any in-flight I/O-do\nnot terminate immediately; they remain valid until the last reference is\ndropped and the driver's release() is invoked.\n\nTherefore, freeing device memory on the error path after hackrf_probe()\nhas registered dev it will lead to a race to use-after-free vuln, since\nthose already-open handles haven't been released yet.\n\nAnd since release() free memory too, race to use-after-free and\ndouble-free vuln occur.\n\nTo prevent this, if device is registered from probe(), it should be\nmodified to free memory only through release() rather than calling\nkfree() directly.",
  "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": "6.1.175",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31576"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/87b9685cca91ed715c39ba544715832d26a7f4b4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/131ec9046e1c8af101aebdaec4e8095e05f3312b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/67fd62e3efdc9dce01f76d95a745212f4feb38e6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/45cbaf5c7cdc5386d86377f0daf94a17a007fed0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/98a0a81ce78020c2522e0046f49d200de9778cb9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/07e9e674b6146b1f6fc41b1f54b8968bf2802824"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2145c71a8044362e82e9923f001ba2aeb771b848"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fcd1d70792a35c8a97414fe429f48311e41269c2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3b7da2b4d0fe014eff181ed37e3bf832eb8ed258"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-06-15T02:03:26Z"
  }
}