CVE-2025-38556 (GCVE-0-2025-38556)
Vulnerability from cvelistv5
Published
2025-08-19 17:02
Modified
2025-09-09 17:06
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/865ad8469fa24de1559f247d9426ab01e5ce3a56
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8b4a94b1510f6a46ec48494b52ee8f67eb4fc836
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a6b87bfc2ab5bccb7ad953693c85d9062aef3fdd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d3b504146c111548ab60b6ef7aad00bfb1db05a2
Impacted products
Vendor Product Version
Linux Linux Version: dde5845a529ff753364a6d1aea61180946270bfa
Version: dde5845a529ff753364a6d1aea61180946270bfa
Version: dde5845a529ff753364a6d1aea61180946270bfa
Version: dde5845a529ff753364a6d1aea61180946270bfa
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   Linux Linux Version: 2.6.20
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-core.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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            },
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              "version": "6.12.46",
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            {
              "lessThanOrEqual": "6.15.*",
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              "version": "6.15.10",
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            {
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              "version": "6.16.1",
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            {
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              "version": "6.17-rc1",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-09T17:06:16.166Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/d3b504146c111548ab60b6ef7aad00bfb1db05a2"
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        },
        {
          "url": "https://git.kernel.org/stable/c/a6b87bfc2ab5bccb7ad953693c85d9062aef3fdd"
        }
      ],
      "title": "HID: core: Harden s32ton() against conversion to 0 bits",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38556",
    "datePublished": "2025-08-19T17:02:34.929Z",
    "dateReserved": "2025-04-16T04:51:24.025Z",
    "dateUpdated": "2025-09-09T17:06:16.166Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38556\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-19T17:15:31.817\",\"lastModified\":\"2025-09-09T17:15:45.080\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: HID: n\u00facleo: Reforzar s32ton() contra la conversi\u00f3n a 0 bits. Las pruebas realizadas por el fuzzer syzbot mostraron que el n\u00facleo HID recibe una excepci\u00f3n de desplazamiento fuera de los l\u00edmites al intentar convertir una cantidad de 32 bits a una cantidad de 0 bits. Idealmente, esto nunca deber\u00eda ocurrir, pero existen dispositivos con errores y algunos podr\u00edan tener un campo de informe con un tama\u00f1o establecido en cero; no deber\u00edamos rechazar el informe ni el dispositivo solo por eso. En su lugar, reforzar la rutina s32ton() para que devuelva un resultado razonable en lugar de bloquearse al llamarla con el n\u00famero de bits establecido en 0, igual que ocurre con snto32().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/865ad8469fa24de1559f247d9426ab01e5ce3a56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8b4a94b1510f6a46ec48494b52ee8f67eb4fc836\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6b87bfc2ab5bccb7ad953693c85d9062aef3fdd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d3b504146c111548ab60b6ef7aad00bfb1db05a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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