ghsa-hfwg-2mm4-h8c4
Vulnerability from github
Published
2024-06-19 15:30
Modified
2024-11-07 18:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

media: mxl111sf: change mutex_init() location

Syzbot reported, that mxl111sf_ctrl_msg() uses uninitialized mutex. The problem was in wrong mutex_init() location.

Previous mutex_init(&state->msg_lock) call was in ->init() function, but dvb_usbv2_init() has this order of calls:

dvb_usbv2_init()
  dvb_usbv2_adapter_init()
    dvb_usbv2_adapter_frontend_init()
      props->frontend_attach()

  props->init()

Since mxl111sf_ devices call mxl111sf_ctrl_msg() in ->frontend_attach() internally we need to initialize state->msg_lock before frontend_attach(). To achieve it, ->probe() call added to all mxl111sf_ devices, which will simply initiaize mutex.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47583"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-908"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-19T15:15:52Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mxl111sf: change mutex_init() location\n\nSyzbot reported, that mxl111sf_ctrl_msg() uses uninitialized\nmutex. The problem was in wrong mutex_init() location.\n\nPrevious mutex_init(\u0026state-\u003emsg_lock) call was in -\u003einit() function, but\ndvb_usbv2_init() has this order of calls:\n\n\tdvb_usbv2_init()\n\t  dvb_usbv2_adapter_init()\n\t    dvb_usbv2_adapter_frontend_init()\n\t      props-\u003efrontend_attach()\n\n\t  props-\u003einit()\n\nSince mxl111sf_* devices call mxl111sf_ctrl_msg() in -\u003efrontend_attach()\ninternally we need to initialize state-\u003emsg_lock before\nfrontend_attach(). To achieve it, -\u003eprobe() call added to all mxl111sf_*\ndevices, which will simply initiaize mutex.",
  "id": "GHSA-hfwg-2mm4-h8c4",
  "modified": "2024-11-07T18:31:21Z",
  "published": "2024-06-19T15:30:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47583"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44870a9e7a3c24acbb3f888b2a7cc22c9bdf7e7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b2d9600b31f9ba7adbc9f3c54a068615d27b390"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c6fdf62bfe1bc72bfceeaf832ef7499c7ed09ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96f182c9f48b984447741f054ec301fdc8517035"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b99bdf127af91d53919e96292c05f737c45ea59a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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