CVE-2026-89628 (GCVE-0-2026-89628)
Vulnerability from cvelistv5
Published
2026-09-11 19:45
Modified
2026-10-19 08:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: picolcd: clamp eeprom debugfs read to bytes actually received picolcd_debug_eeprom_read() trusts resp->raw_data[2] -- a length byte supplied by the device in its REPORT_EE_DATA reply -- clamped only to the caller's read() count: ret = resp->raw_data[2]; if (ret > s) ret = s; if (copy_to_user(u, resp->raw_data+3, ret)) It never checks resp->raw_size, the number of bytes picolcd_raw_event() actually copied into the 64-byte raw_data[] of the kmalloc'd struct picolcd_pending. A device (or a spoofed picoLCD) returning a length byte of 0xff, read with a count >= 255, makes copy_to_user() read past raw_data[] into adjacent slab memory and return it to userspace through the debugfs "eeprom" file: BUG: KASAN: slab-out-of-bounds in _copy_to_user Read of size 255 ... picolcd_debug_eeprom_read+0x214/0x2f0 [hid_picolcd] The debug-dump path in the same file already validates the device length byte against the received size before trusting it; this read does not. The file is created S_IRUSR (root-only) and a crafted device is needed, so it is neither unprivileged- nor remotely-triggerable. Clamp the copy length to resp->raw_size - 3 (the payload actually received, minus the 3-byte header), floored at 0 for short replies.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba
Version: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba
Version: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba
Version: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba
Version: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba
Version: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba
Version: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba
Version: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-picolcd_debugfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            }
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-picolcd_debugfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.35"
            },
            {
              "lessThan": "2.6.35",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
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                  "vulnerable": true
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.6.157",
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                  "vulnerable": true
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                {
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                {
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.3",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: picolcd: clamp eeprom debugfs read to bytes actually received\n\npicolcd_debug_eeprom_read() trusts resp-\u003eraw_data[2] -- a length byte\nsupplied by the device in its REPORT_EE_DATA reply -- clamped only to\nthe caller\u0027s read() count:\n\n\tret = resp-\u003eraw_data[2];\n\tif (ret \u003e s)\n\t\tret = s;\n\tif (copy_to_user(u, resp-\u003eraw_data+3, ret))\n\nIt never checks resp-\u003eraw_size, the number of bytes picolcd_raw_event()\nactually copied into the 64-byte raw_data[] of the kmalloc\u0027d struct\npicolcd_pending. A device (or a spoofed picoLCD) returning a length byte\nof 0xff, read with a count \u003e= 255, makes copy_to_user() read past\nraw_data[] into adjacent slab memory and return it to userspace through\nthe debugfs \"eeprom\" file:\n\n\tBUG: KASAN: slab-out-of-bounds in _copy_to_user\n\tRead of size 255 ... picolcd_debug_eeprom_read+0x214/0x2f0 [hid_picolcd]\n\nThe debug-dump path in the same file already validates the device length\nbyte against the received size before trusting it; this read does not.\nThe file is created S_IRUSR (root-only) and a crafted device is needed,\nso it is neither unprivileged- nor remotely-triggerable.\n\nClamp the copy length to resp-\u003eraw_size - 3 (the payload actually\nreceived, minus the 3-byte header), floored at 0 for short replies."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:50:00.490Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1a02056c2bf7ef9b5fd05ee6913aeeadb703c443"
        },
        {
          "url": "https://git.kernel.org/stable/c/65daa322f1021d8206f8032c4cd4c0cb2d26c7c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/8dc662af019158690c470edd2e2857657f700abb"
        },
        {
          "url": "https://git.kernel.org/stable/c/4daf432c94a42e7be6aa10b012b33af5ed9bc118"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3e6e8d7198a9f3861861520a38b673684a1062b"
        },
        {
          "url": "https://git.kernel.org/stable/c/471f4a939c66d1d44aece2321807abf609fc9098"
        },
        {
          "url": "https://git.kernel.org/stable/c/699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84"
        },
        {
          "url": "https://git.kernel.org/stable/c/e9c667395ac1f8024f623250b32bae4c7af9caa0"
        }
      ],
      "title": "HID: picolcd: clamp eeprom debugfs read to bytes actually received",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89628",
    "datePublished": "2026-09-11T19:45:24.203Z",
    "dateReserved": "2026-09-11T19:38:34.738Z",
    "dateUpdated": "2026-10-19T08:50:00.490Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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