ghsa-9v94-8833-hv33
Vulnerability from github
Published
2024-08-17 09:30
Modified
2024-08-19 06:30
Details

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

protect the fetch of ->fd[fd] in do_dup2() from mispredictions

both callers have verified that fd is not greater than ->max_fds; however, misprediction might end up with tofree = fdt->fd[fd]; being speculatively executed. That's wrong for the same reasons why it's wrong in close_fd()/file_close_fd_locked(); the same solution applies - array_index_nospec(fd, fdt->max_fds) could differ from fd only in case of speculative execution on mispredicted path.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-42265"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-08-17T09:15:07Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nprotect the fetch of -\u003efd[fd] in do_dup2() from mispredictions\n\nboth callers have verified that fd is not greater than -\u003emax_fds;\nhowever, misprediction might end up with\n        tofree = fdt-\u003efd[fd];\nbeing speculatively executed.  That\u0027s wrong for the same reasons\nwhy it\u0027s wrong in close_fd()/file_close_fd_locked(); the same\nsolution applies - array_index_nospec(fd, fdt-\u003emax_fds) could differ\nfrom fd only in case of speculative execution on mispredicted path.",
  "id": "GHSA-9v94-8833-hv33",
  "modified": "2024-08-19T06:30:53Z",
  "published": "2024-08-17T09:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-42265"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08775b3d6ed117cf4518754ec7300ee42b6a5368"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1171ceccabfd596ca370c5d2cbb47d110c3f2fe1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f480493550b6a23d3a65d095d6569d4a7f56a0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41a6c31df77bd8e050136b0a200b537da9e1084a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5db999fff545b924b24c9afd368ef5c17279b176"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8aa37bde1a7b645816cda8b80df4753ecf172bf1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da72e783afd27d9f487836b2e6738146c0edd149"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed42e8ff509d2a61c6642d1825032072dab79f26"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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