ghsa-22gp-7w9x-c2xx
Vulnerability from github
Published
2024-05-20 12:30
Modified
2024-05-20 12:30
Details

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

drm/ast: Fix soft lockup

There is a while-loop in ast_dp_set_on_off() that could lead to infinite-loop. This is because the register, VGACRI-Dx, checked in this API is a scratch register actually controlled by a MCU, named DPMCU, in BMC.

These scratch registers are protected by scu-lock. If suc-lock is not off, DPMCU can not update these registers and then host will have soft lockup due to never updated status.

DPMCU is used to control DP and relative registers to handshake with host's VGA driver. Even the most time-consuming task, DP's link training, is less than 100ms. 200ms should be enough.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-35952"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-20T10:15:10Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/ast: Fix soft lockup\n\nThere is a while-loop in ast_dp_set_on_off() that could lead to\ninfinite-loop. This is because the register, VGACRI-Dx, checked in\nthis API is a scratch register actually controlled by a MCU, named\nDPMCU, in BMC.\n\nThese scratch registers are protected by scu-lock. If suc-lock is not\noff, DPMCU can not update these registers and then host will have soft\nlockup due to never updated status.\n\nDPMCU is used to control DP and relative registers to handshake with\nhost\u0027s VGA driver. Even the most time-consuming task, DP\u0027s link\ntraining, is less than 100ms. 200ms should be enough.",
  "id": "GHSA-22gp-7w9x-c2xx",
  "modified": "2024-05-20T12:30:27Z",
  "published": "2024-05-20T12:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-35952"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35768baf0fdfc47ede42d899506bad78450e9294"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a6fea3fcb577a543ef67683ca7105bde49a38fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a81b2acd43e24e419f65df97348c76a5a1496066"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc004f5038220b1891ef4107134ccae44be55109"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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