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

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-10-19 08:50
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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
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)
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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 , ≤ * (original_commit_for_fix)
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{
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          "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."
        }
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        {
          "url": "https://git.kernel.org/stable/c/e9c667395ac1f8024f623250b32bae4c7af9caa0"
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    "dateReserved": "2026-09-11T19:38:34.738Z",
    "dateUpdated": "2026-10-19T08:50:00.490Z",
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      "title": "HID: picolcd: clamp eeprom debugfs read to bytes actually received",
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            "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."
          }
        ],
        "id": "CVE-2026-89628",
        "lastModified": "2026-10-19T09:17:59.717",
        "metrics": {},
        "published": "2026-09-11T20:19:48.270",
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-17T21:22:56+00:00",
      "cve": "CVE-2026-89628",
      "id": "CVE-2026-89628",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "263",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: HID: picolcd: clamp eeprom debugfs read to bytes actually received",
      "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": "2026-10-20T01:06:09Z",
      "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": "85",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89628",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-89628.json",
      "version": "5"
    }
  }
}



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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.