fkie_cve-2022-50499
Vulnerability from fkie_nvd
Published
2025-10-04 16:15
Modified
2025-10-06 14:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: media: dvb-core: Fix double free in dvb_register_device() In function dvb_register_device() -> dvb_register_media_device() -> dvb_create_media_entity(), dvb->entity is allocated and initialized. If the initialization fails, it frees the dvb->entity, and return an error code. The caller takes the error code and handles the error by calling dvb_media_device_free(), which unregisters the entity and frees the field again if it is not NULL. As dvb->entity may not NULLed in dvb_create_media_entity() when the allocation of dvbdev->pad fails, a double free may occur. This may also cause an Use After free in media_device_unregister_entity(). Fix this by storing NULL to dvb->entity when it is freed.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0588b12c418c3e4f927ced11f27b02ef4a5bfb07
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/123eddf92a114e03919942641d2c2b1f4ca56ea6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6b0d0477fce747d4137aa65856318b55fba72198
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70bc51303871159796b55ba1a8f16637b46c2511
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/772892b29ac50c2c5e918fc80104aa6ede81d837
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7dd5a68cdbbbe7fc67ba701cb52ba10d8ba149f8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/acf984a3718c2458eb9e08b6714490a04f213c58
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b21f62b49ee9c3e0216d685d9cfd6003e5727271
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e9a78485b658361fab6a5547377be6c1af6f1b3d
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: dvb-core: Fix double free in dvb_register_device()\n\nIn function dvb_register_device() -\u003e dvb_register_media_device() -\u003e\ndvb_create_media_entity(), dvb-\u003eentity is allocated and initialized. If\nthe initialization fails, it frees the dvb-\u003eentity, and return an error\ncode. The caller takes the error code and handles the error by calling\ndvb_media_device_free(), which unregisters the entity and frees the\nfield again if it is not NULL. As dvb-\u003eentity may not NULLed in\ndvb_create_media_entity() when the allocation of dvbdev-\u003epad fails, a\ndouble free may occur. This may also cause an Use After free in\nmedia_device_unregister_entity().\n\nFix this by storing NULL to dvb-\u003eentity when it is freed."
    }
  ],
  "id": "CVE-2022-50499",
  "lastModified": "2025-10-06T14:56:21.733",
  "metrics": {},
  "published": "2025-10-04T16:15:47.027",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0588b12c418c3e4f927ced11f27b02ef4a5bfb07"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/123eddf92a114e03919942641d2c2b1f4ca56ea6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6b0d0477fce747d4137aa65856318b55fba72198"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70bc51303871159796b55ba1a8f16637b46c2511"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/772892b29ac50c2c5e918fc80104aa6ede81d837"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7dd5a68cdbbbe7fc67ba701cb52ba10d8ba149f8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/acf984a3718c2458eb9e08b6714490a04f213c58"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b21f62b49ee9c3e0216d685d9cfd6003e5727271"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e9a78485b658361fab6a5547377be6c1af6f1b3d"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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