GHSA-FR7F-QH29-24JQ

Vulnerability from github – Published: 2025-08-19 18:31 – Updated: 2026-01-19 15:30
VLAI?
Details

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

HID: core: Harden s32ton() against conversion to 0 bits

Testing by the syzbot fuzzer showed that the HID core gets a shift-out-of-bounds exception when it tries to convert a 32-bit quantity to a 0-bit quantity. Ideally this should never occur, but there are buggy devices and some might have a report field with size set to zero; we shouldn't reject the report or the device just because of that.

Instead, harden the s32ton() routine so that it returns a reasonable result instead of crashing when it is called with the number of bits set to 0 -- the same as what snto32() does.

Severity ?
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-38556"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-19T17:15:31Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: Harden s32ton() against conversion to 0 bits\n\nTesting by the syzbot fuzzer showed that the HID core gets a\nshift-out-of-bounds exception when it tries to convert a 32-bit\nquantity to a 0-bit quantity.  Ideally this should never occur, but\nthere are buggy devices and some might have a report field with size\nset to zero; we shouldn\u0027t reject the report or the device just because\nof that.\n\nInstead, harden the s32ton() routine so that it returns a reasonable\nresult instead of crashing when it is called with the number of bits\nset to 0 -- the same as what snto32() does.",
  "id": "GHSA-fr7f-qh29-24jq",
  "modified": "2026-01-19T15:30:32Z",
  "published": "2025-08-19T18:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38556"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c86548a20d7bc2861aa4de044991a327bebad1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6cdf6c708717c5c6897d0800a1793e83757c7491"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/810189546cb6c8f36443ed091d91f1f5d2fc2ec7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/865ad8469fa24de1559f247d9426ab01e5ce3a56"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8b4a94b1510f6a46ec48494b52ee8f67eb4fc836"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6b87bfc2ab5bccb7ad953693c85d9062aef3fdd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3b504146c111548ab60b6ef7aad00bfb1db05a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eeeaba737919bdce9885e2a00ac2912f61a3684d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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