CVE-2026-31576 (GCVE-0-2026-31576)
Vulnerability from cvelistv5
Published
2026-04-24 14:42
Modified
2026-04-27 13:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: media: hackrf: fix to not free memory after the device is registered in hackrf_probe() In hackrf driver, the following race condition occurs: ``` CPU0 CPU1 hackrf_probe() kzalloc(); // alloc hackrf_dev .... v4l2_device_register(); .... fd = sys_open("/path/to/dev"); // open hackrf fd .... v4l2_device_unregister(); .... kfree(); // free hackrf_dev .... sys_ioctl(fd, ...); v4l2_ioctl(); video_is_registered() // UAF!! .... sys_close(fd); v4l2_release() // UAF!! hackrf_video_release() kfree(); // DFB!! ``` When a V4L2 or video device is unregistered, the device node is removed so new open() calls are blocked. However, file descriptors that are already open-and any in-flight I/O-do not terminate immediately; they remain valid until the last reference is dropped and the driver's release() is invoked. Therefore, freeing device memory on the error path after hackrf_probe() has registered dev it will lead to a race to use-after-free vuln, since those already-open handles haven't been released yet. And since release() free memory too, race to use-after-free and double-free vuln occur. To prevent this, if device is registered from probe(), it should be modified to free memory only through release() rather than calling kfree() directly.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8bc4a9ed85046c214458c9e82aea75d2f46cfffd
Version: 8bc4a9ed85046c214458c9e82aea75d2f46cfffd
Version: 8bc4a9ed85046c214458c9e82aea75d2f46cfffd
Version: 8bc4a9ed85046c214458c9e82aea75d2f46cfffd
Version: 8bc4a9ed85046c214458c9e82aea75d2f46cfffd
Version: 8bc4a9ed85046c214458c9e82aea75d2f46cfffd
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/usb/hackrf/hackrf.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "status": "unaffected",
              "version": "6.12.83",
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              "status": "unaffected",
              "version": "6.18.24",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "7.1-rc1",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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\u0027t 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-27T13:56:23.791Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/45cbaf5c7cdc5386d86377f0daf94a17a007fed0"
        },
        {
          "url": "https://git.kernel.org/stable/c/98a0a81ce78020c2522e0046f49d200de9778cb9"
        },
        {
          "url": "https://git.kernel.org/stable/c/07e9e674b6146b1f6fc41b1f54b8968bf2802824"
        },
        {
          "url": "https://git.kernel.org/stable/c/2145c71a8044362e82e9923f001ba2aeb771b848"
        },
        {
          "url": "https://git.kernel.org/stable/c/fcd1d70792a35c8a97414fe429f48311e41269c2"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b7da2b4d0fe014eff181ed37e3bf832eb8ed258"
        }
      ],
      "title": "media: hackrf: fix to not free memory after the device is registered in hackrf_probe()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31576",
    "datePublished": "2026-04-24T14:42:08.188Z",
    "dateReserved": "2026-03-09T15:48:24.119Z",
    "dateUpdated": "2026-04-27T13:56:23.791Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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