ghsa-6qfm-4c78-cfqr
Vulnerability from github
Published
2024-09-18 09:30
Modified
2025-11-03 21:31
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Details

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

powerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas()

Smatch warns:

arch/powerpc/kernel/rtas.c:1932 __do_sys_rtas() warn: potential spectre issue 'args.args' [r] (local cap)

The 'nargs' and 'nret' locals come directly from a user-supplied buffer and are used as indexes into a small stack-based array and as inputs to copy_to_user() after they are subject to bounds checks.

Use array_index_nospec() after the bounds checks to clamp these values for speculative execution.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2024-46774"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-18T08:15:05Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas()\n\nSmatch warns:\n\n  arch/powerpc/kernel/rtas.c:1932 __do_sys_rtas() warn: potential\n  spectre issue \u0027args.args\u0027 [r] (local cap)\n\nThe \u0027nargs\u0027 and \u0027nret\u0027 locals come directly from a user-supplied\nbuffer and are used as indexes into a small stack-based array and as\ninputs to copy_to_user() after they are subject to bounds checks.\n\nUse array_index_nospec() after the bounds checks to clamp these values\nfor speculative execution.",
  "id": "GHSA-6qfm-4c78-cfqr",
  "modified": "2025-11-03T21:31:13Z",
  "published": "2024-09-18T09:30:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-46774"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0974d03eb479384466d828d65637814bee6b26d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f1feff02e9da0dd0cdb195c428c42b5f9b6c771"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68d8156480940b79227d58865ec5d2947b9384a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a262c2dc833f2fe1bd5c53a4d899e7077d3b1da9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b137af795399d8b657bad1646c18561530f35ed1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2834ff1d9641a8695a09ea79cd901c7b6d4d05f"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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