ghsa-7rjr-qxc3-7hh3
Vulnerability from github
Published
2024-08-21 09:31
Modified
2024-09-11 18:31
Details

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

io_uring/poll: don't reissue in case of poll race on multishot request

A previous commit fixed a poll race that can occur, but it's only applicable for multishot requests. For a multishot request, we can safely ignore a spurious wakeup, as we never leave the waitqueue to begin with.

A blunt reissue of a multishot armed request can cause us to leak a buffer, if they are ring provided. While this seems like a bug in itself, it's not really defined behavior to reissue a multishot request directly. It's less efficient to do so as well, and not required to rearm anything like it is for singleshot poll requests.

Show details on source website


{
  "affected": [],
  "aliases": [
    "CVE-2023-52895"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-08-21T07:15:06Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/poll: don\u0027t reissue in case of poll race on multishot request\n\nA previous commit fixed a poll race that can occur, but it\u0027s only\napplicable for multishot requests. For a multishot request, we can safely\nignore a spurious wakeup, as we never leave the waitqueue to begin with.\n\nA blunt reissue of a multishot armed request can cause us to leak a\nbuffer, if they are ring provided. While this seems like a bug in itself,\nit\u0027s not really defined behavior to reissue a multishot request directly.\nIt\u0027s less efficient to do so as well, and not required to rearm anything\nlike it is for singleshot poll requests.",
  "id": "GHSA-7rjr-qxc3-7hh3",
  "modified": "2024-09-11T18:31:02Z",
  "published": "2024-08-21T09:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52895"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36fc7317cdb16cfeae0f879916995037bb615ac4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8caa03f10bf92cb8657408a6ece6a8a73f96ce13"
    }
  ],
  "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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