ghsa-76f5-923v-9jc3
Vulnerability from github
Published
2025-09-15 15:31
Modified
2025-09-15 15:31
Details

In the Linux kernel, the following vulnerability has been resolved:

media: netup_unidvb: fix use-after-free at del_timer()

When Universal DVB card is detaching, netup_unidvb_dma_fini() uses del_timer() to stop dma->timeout timer. But when timer handler netup_unidvb_dma_timeout() is running, del_timer() could not stop it. As a result, the use-after-free bug could happen. The process is shown below:

(cleanup routine)          |        (timer routine)
                           | mod_timer(&dev->tx_sim_timer, ..)

netup_unidvb_finidev() | (wait a time) netup_unidvb_dma_fini() | netup_unidvb_dma_timeout() del_timer(&dma->timeout); | | ndev->pci_dev->dev //USE

Fix by changing del_timer() to del_timer_sync().

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2023-53219"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-15T15:15:48Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: netup_unidvb: fix use-after-free at del_timer()\n\nWhen Universal DVB card is detaching, netup_unidvb_dma_fini()\nuses del_timer() to stop dma-\u003etimeout timer. But when timer\nhandler netup_unidvb_dma_timeout() is running, del_timer()\ncould not stop it. As a result, the use-after-free bug could\nhappen. The process is shown below:\n\n    (cleanup routine)          |        (timer routine)\n                               | mod_timer(\u0026dev-\u003etx_sim_timer, ..)\nnetup_unidvb_finidev()         | (wait a time)\n  netup_unidvb_dma_fini()      | netup_unidvb_dma_timeout()\n    del_timer(\u0026dma-\u003etimeout);  |\n                               |   ndev-\u003epci_dev-\u003edev //USE\n\nFix by changing del_timer() to del_timer_sync().",
  "id": "GHSA-76f5-923v-9jc3",
  "modified": "2025-09-15T15:31:28Z",
  "published": "2025-09-15T15:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53219"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/051af3f0b7d1cd8ab7f3e2523ad8ae1af44caba3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07821524f67bf920342bc84ae8b3dea2a315a89e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f5bb36bf9b39a2a96e730bf4455095b50713f63"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1550bcf2983ae1220cc8ab899a39a423fa7cb523"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90229e9ee957d4514425e4a4d82c50ab5d57ac4d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c8f9c05e1ebcc9c7bc211cc8b74d8fb86a8756fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd5c77814f290b353917df329f36de1472d47154"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9982db735a8495eee14267cf193c806b957e942"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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