Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-10-19 08:50

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 6641 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/1a02056c2bf7ef9b5…
https://git.kernel.org/stable/c/65daa322f1021d820…
https://git.kernel.org/stable/c/8dc662af019158690…
https://git.kernel.org/stable/c/4daf432c94a42e7be…
https://git.kernel.org/stable/c/a3e6e8d7198a9f386…
https://git.kernel.org/stable/c/471f4a939c66d1d44…
https://git.kernel.org/stable/c/699a3c8b56e168ca1…
https://git.kernel.org/stable/c/e9c667395ac1f8024…

Impacted products

2 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
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)	guessed

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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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    "datePublished": "2026-09-11T19:45:24.203Z",
    "dateReserved": "2026-09-11T19:38:34.738Z",
    "dateUpdated": "2026-10-19T08:50:00.490Z",
    "state": "PUBLISHED"
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      "product_status:fixed": "1",
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      "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": "3"
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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."
          }
        ],
        "id": "CVE-2026-89628",
        "lastModified": "2026-10-19T09:17:59.717",
        "metrics": {},
        "published": "2026-09-11T20:19:48.270",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/65daa322f1021d8206f8032c4cd4c0cb2d26c7c3"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e9c667395ac1f8024f623250b32bae4c7af9caa0"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T01:19:39+00:00",
      "cve": "CVE-2026-89628",
      "id": "CVE-2026-89628",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "189",
      "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"
    }
  }
}

GHSA-84X9-CXQ8-HPGQ

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-89628"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:48Z",
    "severity": null
  },
  "details": "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": "GHSA-84x9-cxq8-hpgq",
  "modified": "2026-09-14T15:32:33Z",
  "published": "2026-09-11T21:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89628"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a02056c2bf7ef9b5fd05ee6913aeeadb703c443"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/471f4a939c66d1d44aece2321807abf609fc9098"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4daf432c94a42e7be6aa10b012b33af5ed9bc118"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65daa322f1021d8206f8032c4cd4c0cb2d26c7c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8dc662af019158690c470edd2e2857657f700abb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3e6e8d7198a9f3861861520a38b673684a1062b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e9c667395ac1f8024f623250b32bae4c7af9caa0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

MSRC_CVE-2026-89628

Vulnerability from csaf_microsoft - Published: 2026-09-13 01:09 - Updated: 2026-10-02 02:20

Summary

HID: picolcd: clamp eeprom debugfs read to bytes actually received

Scope

1 vulnerability in this advisory, including CVE-2026-89628.

CVE-2026-89628

Fixed: 1 product Known affected: 2 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OPENSUSE-SU-2026:11880-1

Vulnerability from csaf_opensuse - Published: 2026-09-24 00:00 - Updated: 2026-11-04 21:56

Summary

kernel-devel-7.2.7-1.1 on GA media

Severity

Moderate

Scope

904 vulnerabilities in this advisory, including CVE-2026-89628.

CVE-2026-89628

5.4 (Medium)


                
                  CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H

Recommended: 16 products

Open the full advisory

OPENSUSE-SU-2026:22266-1

Vulnerability from csaf_opensuse - Published: 2026-11-09 17:28 - Updated: 2026-11-13 19:21

Summary

Security update for the Linux Kernel

Severity

Important

Scope

1356 vulnerabilities in this advisory, including CVE-2026-89628.

CVE-2026-89628

5.4 (Medium)


                
                  CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H

Recommended: 136 products

Open the full advisory

OPENSUSE-SU-2026:22307-1

Vulnerability from csaf_opensuse - Published: 2026-11-09 11:39 - Updated: 2026-11-13 19:21

Summary

Security update for the Linux Kernel

Severity

Important

Scope

1390 vulnerabilities in this advisory, including CVE-2026-89628.

CVE-2026-89628

5.4 (Medium)


                
                  CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H

Recommended: 12 products

Open the full advisory

OPENSUSE-SU-2026:22309-1

Vulnerability from csaf_opensuse - Published: 2026-11-09 18:11 - Updated: 2026-11-13 19:22

Summary

Security update for the Linux Kernel

Severity

Important

Scope

2819 vulnerabilities in this advisory, including CVE-2026-89628.

CVE-2026-89628

5.4 (Medium)


                
                  CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H

Recommended: 136 products

Open the full advisory

SUSE-SU-2026:24550-1

Vulnerability from csaf_suse - Published: 2026-11-03 19:25 - Updated: 2026-11-06 11:24

Summary

Security update for the Linux Kernel

Severity

Important

Scope

1056 vulnerabilities in this advisory, including CVE-2026-89628.

CVE-2026-89628

5.4 (Medium)


                
                  CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H

Recommended: 11 products

Open the full advisory

SUSE-SU-2026:24619-1

Vulnerability from csaf_suse - Published: 2026-11-03 18:30 - Updated: 2026-11-11 19:14

Summary

Security update for the Linux Kernel

Severity

Important

Scope

1056 vulnerabilities in this advisory, including CVE-2026-89628.

CVE-2026-89628

5.4 (Medium)


                
                  CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H

Recommended: 17 products

Open the full advisory

SUSE-SU-2026:24643-1

Vulnerability from csaf_suse - Published: 2026-11-09 15:48 - Updated: 2026-11-11 19:14

Summary

Security update for the Linux Kernel

Severity

Important

Scope

1356 vulnerabilities in this advisory, including CVE-2026-89628.

CVE-2026-89628

5.4 (Medium)


                
                  CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H

Recommended: 28 products

Open the full advisory

SUSE-SU-2026:24648-1

Vulnerability from csaf_suse - Published: 2026-11-09 15:25 - Updated: 2026-11-11 19:14

Summary

Security update for the Linux Kernel

Severity

Important

Scope

1356 vulnerabilities in this advisory, including CVE-2026-89628.

CVE-2026-89628

5.4 (Medium)


                
                  CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H

Recommended: 8 products

Open the full advisory

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

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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CVE-2026-89628 (GCVE-0-2026-89628)

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