ghsa-5mg2-h7qv-m552
Vulnerability from github
Published
2024-04-05 09:30
Modified
2025-03-28 00:31
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:

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: "MODERATE",
   },
   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: "2025-03-28T00:31:28Z",
   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: [
      {
         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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