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CVE-2026-89628 (GCVE-0-2026-89628)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01
VLAI
Title
HID: picolcd: clamp eeprom debugfs read to bytes actually received
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba , < 1a02056c2bf7ef9b5fd05ee6913aeeadb703c443 (git)
Affected: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba , < 65daa322f1021d8206f8032c4cd4c0cb2d26c7c3 (git)
Affected: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba , < 8dc662af019158690c470edd2e2857657f700abb (git)
Affected: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba , < 4daf432c94a42e7be6aa10b012b33af5ed9bc118 (git)
Affected: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba , < a3e6e8d7198a9f3861861520a38b673684a1062b (git)
Affected: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba , < 471f4a939c66d1d44aece2321807abf609fc9098 (git)
Affected: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba , < 699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84 (git)
Affected: 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba , < e9c667395ac1f8024f623250b32bae4c7af9caa0 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "operator": "OR"
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      "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": "2026-09-14T12:01:39.578Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/65daa322f1021d8206f8032c4cd4c0cb2d26c7c3"
        },
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          "url": "https://git.kernel.org/stable/c/8dc662af019158690c470edd2e2857657f700abb"
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          "url": "https://git.kernel.org/stable/c/a3e6e8d7198a9f3861861520a38b673684a1062b"
        },
        {
          "url": "https://git.kernel.org/stable/c/471f4a939c66d1d44aece2321807abf609fc9098"
        },
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        {
          "url": "https://git.kernel.org/stable/c/e9c667395ac1f8024f623250b32bae4c7af9caa0"
        }
      ],
      "title": "HID: picolcd: clamp eeprom debugfs read to bytes actually received",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89628",
    "datePublished": "2026-09-11T19:45:24.203Z",
    "dateReserved": "2026-09-11T19:38:34.738Z",
    "dateUpdated": "2026-09-14T12:01:39.578Z",
    "state": "PUBLISHED"
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      "percentile": "0.12551"
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      "cve": "CVE-2026-89628",
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "HID: picolcd: clamp eeprom debugfs read to bytes actually received",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89628.json",
      "version": "2"
    },
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/hid/hid-picolcd_debugfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\"lessThan\":\"1a02056c2bf7ef9b5fd05ee6913aeeadb703c443\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\"lessThan\":\"65daa322f1021d8206f8032c4cd4c0cb2d26c7c3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\"lessThan\":\"8dc662af019158690c470edd2e2857657f700abb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\"lessThan\":\"4daf432c94a42e7be6aa10b012b33af5ed9bc118\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\"lessThan\":\"a3e6e8d7198a9f3861861520a38b673684a1062b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\"lessThan\":\"471f4a939c66d1d44aece2321807abf609fc9098\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\"lessThan\":\"699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\"lessThan\":\"e9c667395ac1f8024f623250b32bae4c7af9caa0\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/hid/hid-picolcd_debugfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.35\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.35\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1a02056c2bf7ef9b5fd05ee6913aeeadb703c443\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/471f4a939c66d1d44aece2321807abf609fc9098\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4daf432c94a42e7be6aa10b012b33af5ed9bc118\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/65daa322f1021d8206f8032c4cd4c0cb2d26c7c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8dc662af019158690c470edd2e2857657f700abb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a3e6e8d7198a9f3861861520a38b673684a1062b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e9c667395ac1f8024f623250b32bae4c7af9caa0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-15T04:54:27+00:00",
      "cve": "CVE-2026-89628",
      "id": "CVE-2026-89628",
      "initial_release_date": "2026-09-11T19:45:24.203000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: HID picolcd driver information disclosure via out-of-bounds read",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89628.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:01:21Z",
      "cve": "CVE-2026-89628",
      "id": "CVE-2026-89628",
      "initial_release_date": "2026-09-12T16:24:41Z",
      "product_status:known_affected": "269",
      "product_status:known_not_affected": "84",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89628",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89628.json",
      "version": "3"
    }
  }
}



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