ghsa-5mg2-h7qv-m552
Vulnerability from github
Published
2024-04-05 09:30
Modified
2024-06-25 21:31
Details

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

vfio/pci: Disable auto-enable of exclusive INTx IRQ

Currently for devices requiring masking at the irqchip for INTx, ie. devices without DisINTx support, the IRQ is enabled in request_irq() and subsequently disabled as necessary to align with the masked status flag. This presents a window where the interrupt could fire between these events, resulting in the IRQ incrementing the disable depth twice. This would be unrecoverable for a user since the masked flag prevents nested enables through vfio.

Instead, invert the logic using IRQF_NO_AUTOEN such that exclusive INTx is never auto-enabled, then unmask as required.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-27437"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-05T09:15:09Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/pci: Disable auto-enable of exclusive INTx IRQ\n\nCurrently for devices requiring masking at the irqchip for INTx, ie.\ndevices without DisINTx support, the IRQ is enabled in request_irq()\nand subsequently disabled as necessary to align with the masked status\nflag.  This presents a window where the interrupt could fire between\nthese events, resulting in the IRQ incrementing the disable depth twice.\nThis would be unrecoverable for a user since the masked flag prevents\nnested enables through vfio.\n\nInstead, invert the logic using IRQF_NO_AUTOEN such that exclusive INTx\nis never auto-enabled, then unmask as required.",
  "id": "GHSA-5mg2-h7qv-m552",
  "modified": "2024-06-25T21:31:12Z",
  "published": "2024-04-05T09:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27437"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/139dfcc4d723ab13469881200c7d80f49d776060"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26389925d6c2126fb777821a0a983adca7ee6351"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a4a666c45107206605b7b5bc20545f8aabc4fa2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b3491ad0f80d913e7d255941d4470f4a4d9bfda"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/561d5e1998d58b54ce2bbbb3e843b669aa0b3db5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7a2f0955ffceffadfe098b40b50307431f45438"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf0bc84a20e6109ab07d5dc072067bd01eb931ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe9a7082684eb059b925c535682e68c34d487d43"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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