Vulnerability-Lookup

GHSA-7R46-PV4V-9GXJ

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-24 15:32

Details

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

HID: core: clamp report_size in s32ton() to avoid undefined shift

s32ton() shifts by n-1 where n is the field's report_size, a value that comes directly from a HID device. The HID parser bounds report_size only to <= 256, so a broken HID device can supply a report descriptor with a wide field that triggers shift exponents up to 256 on a 32-bit type when an output report is built via hid_output_field() or hid_set_field().

Commit ec61b41918587 ("HID: core: fix shift-out-of-bounds in hid_report_raw_event") added the same n > 32 clamp to the function snto32(), but s32ton() was never given the same fix as I guess syzbot hadn't figured out how to fuzz a device the same way.

Fix this up by just clamping the max value of n, just like snto32() does.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31624"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:41Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: clamp report_size in s32ton() to avoid undefined shift\n\ns32ton() shifts by n-1 where n is the field\u0027s report_size, a value that\ncomes directly from a HID device.  The HID parser bounds report_size\nonly to \u003c= 256, so a broken HID device can supply a report descriptor\nwith a wide field that triggers shift exponents up to 256 on a 32-bit\ntype when an output report is built via hid_output_field() or\nhid_set_field().\n\nCommit ec61b41918587 (\"HID: core: fix shift-out-of-bounds in\nhid_report_raw_event\") added the same n \u003e 32 clamp to the function\nsnto32(), but s32ton() was never given the same fix as I guess syzbot\nhadn\u0027t figured out how to fuzz a device the same way.\n\nFix this up by just clamping the max value of n, just like snto32()\ndoes.",
  "id": "GHSA-7r46-pv4v-9gxj",
  "modified": "2026-04-24T15:32:35Z",
  "published": "2026-04-24T15:32:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31624"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58386f00af710922cafb0fb69211497beddfaa95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a8333237f1f5caab8d4c3d2c2e7578c4263a97f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97014719bb8fccb1ffcbbc299e84b1f11b114195"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea363a34086ddb4231adc581a7f36c39ec154bfc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-31624 (GCVE-0-2026-31624)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-25 05:48

Title

HID: core: clamp report_size in s32ton() to avoid undefined shift

Summary

In the Linux kernel, the following vulnerability has been resolved: HID: core: clamp report_size in s32ton() to avoid undefined shift s32ton() shifts by n-1 where n is the field's report_size, a value that comes directly from a HID device. The HID parser bounds report_size only to <= 256, so a broken HID device can supply a report descriptor with a wide field that triggers shift exponents up to 256 on a 32-bit type when an output report is built via hid_output_field() or hid_set_field(). Commit ec61b41918587 ("HID: core: fix shift-out-of-bounds in hid_report_raw_event") added the same n > 32 clamp to the function snto32(), but s32ton() was never given the same fix as I guess syzbot hadn't figured out how to fuzz a device the same way. Fix this up by just clamping the max value of n, just like snto32() does.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/58386f00af710922c…
	https://git.kernel.org/stable/c/8a8333237f1f5caab…
	https://git.kernel.org/stable/c/ea363a34086ddb423…
	https://git.kernel.org/stable/c/97014719bb8fccb1f…

Impacted products

Vendor

Product

Version

Linux

Affected: dde5845a529ff753364a6d1aea61180946270bfa , < 58386f00af710922cafb0fb69211497beddfaa95 (git)
Affected: dde5845a529ff753364a6d1aea61180946270bfa , < 8a8333237f1f5caab8d4c3d2c2e7578c4263a97f (git)
Affected: dde5845a529ff753364a6d1aea61180946270bfa , < ea363a34086ddb4231adc581a7f36c39ec154bfc (git)
Affected: dde5845a529ff753364a6d1aea61180946270bfa , < 97014719bb8fccb1ffcbbc299e84b1f11b114195 (git)

Linux

Affected: 2.6.20
Unaffected: 0 , < 2.6.20 (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "58386f00af710922cafb0fb69211497beddfaa95",
              "status": "affected",
              "version": "dde5845a529ff753364a6d1aea61180946270bfa",
              "versionType": "git"
            },
            {
              "lessThan": "8a8333237f1f5caab8d4c3d2c2e7578c4263a97f",
              "status": "affected",
              "version": "dde5845a529ff753364a6d1aea61180946270bfa",
              "versionType": "git"
            },
            {
              "lessThan": "ea363a34086ddb4231adc581a7f36c39ec154bfc",
              "status": "affected",
              "version": "dde5845a529ff753364a6d1aea61180946270bfa",
              "versionType": "git"
            },
            {
              "lessThan": "97014719bb8fccb1ffcbbc299e84b1f11b114195",
              "status": "affected",
              "version": "dde5845a529ff753364a6d1aea61180946270bfa",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.20"
            },
            {
              "lessThan": "2.6.20",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.83",
                  "versionStartIncluding": "2.6.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "versionStartIncluding": "2.6.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "2.6.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.1",
                  "versionStartIncluding": "2.6.20",
                  "vulnerable": true
                }
              ],
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              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: clamp report_size in s32ton() to avoid undefined shift\n\ns32ton() shifts by n-1 where n is the field\u0027s report_size, a value that\ncomes directly from a HID device.  The HID parser bounds report_size\nonly to \u003c= 256, so a broken HID device can supply a report descriptor\nwith a wide field that triggers shift exponents up to 256 on a 32-bit\ntype when an output report is built via hid_output_field() or\nhid_set_field().\n\nCommit ec61b41918587 (\"HID: core: fix shift-out-of-bounds in\nhid_report_raw_event\") added the same n \u003e 32 clamp to the function\nsnto32(), but s32ton() was never given the same fix as I guess syzbot\nhadn\u0027t figured out how to fuzz a device the same way.\n\nFix this up by just clamping the max value of n, just like snto32()\ndoes."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-25T05:48:25.300Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/58386f00af710922cafb0fb69211497beddfaa95"
        },
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          "url": "https://git.kernel.org/stable/c/8a8333237f1f5caab8d4c3d2c2e7578c4263a97f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea363a34086ddb4231adc581a7f36c39ec154bfc"
        },
        {
          "url": "https://git.kernel.org/stable/c/97014719bb8fccb1ffcbbc299e84b1f11b114195"
        }
      ],
      "title": "HID: core: clamp report_size in s32ton() to avoid undefined shift",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31624",
    "datePublished": "2026-04-24T14:42:41.655Z",
    "dateReserved": "2026-03-09T15:48:24.124Z",
    "dateUpdated": "2026-04-25T05:48:25.300Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-7R46-PV4V-9GXJ

CVE-2026-31624 (GCVE-0-2026-31624)

Tags

Sightings

Nomenclature