ghsa-j4qg-w554-c3hr
Vulnerability from github
Published
2025-10-01 12:30
Modified
2025-10-01 12:30
Details

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

media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()

When the driver calls cx23885_risc_buffer() to prepare the buffer, the function call dma_alloc_coherent may fail, resulting in a empty buffer risc->cpu. Later when we free the buffer or access the buffer, null ptr deref is triggered.

This bug is similar to the following one: https://git.linuxtv.org/media_stage.git/commit/?id=2b064d91440b33fba5b452f2d1b31f13ae911d71.

We believe the bug can be also dynamically triggered from user side. Similarly, we fix this by checking the return value of cx23885_risc_buffer() and the value of risc->cpu before buffer free.

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{
  "affected": [],
  "aliases": [
    "CVE-2023-53458"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-01T12:15:47Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()\n\nWhen the driver calls cx23885_risc_buffer() to prepare the buffer, the\nfunction call dma_alloc_coherent may fail, resulting in a empty buffer\nrisc-\u003ecpu. Later when we free the buffer or access the buffer, null ptr\nderef is triggered.\n\nThis bug is similar to the following one:\nhttps://git.linuxtv.org/media_stage.git/commit/?id=2b064d91440b33fba5b452f2d1b31f13ae911d71.\n\nWe believe the bug can be also dynamically triggered from user side.\nSimilarly, we fix this by checking the return value of cx23885_risc_buffer()\nand the value of risc-\u003ecpu before buffer free.",
  "id": "GHSA-j4qg-w554-c3hr",
  "modified": "2025-10-01T12:30:29Z",
  "published": "2025-10-01T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53458"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47e8b73bc35d7c54642f78e498697692f6358996"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b8e5e28e85a546dfccc3895befe0e823fdd7c89"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6738841f6fcf23e9fc30e2449f32fc84ee19c6f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f0a06203f2fe63f04311467200c99c4ee1926578"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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