Vulnerability-Lookup

GHSA-QM8H-24XG-3V98

Vulnerability from github – Published: 2026-08-27 06:31 – Updated: 2026-08-27 06:31

Details

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

Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet

Make finger2 (and also finger1) unsigned, so that if the finger index in the packet is 0 then subtracting 1 creates an array index which overflows above the existing check for FOC_MAX_FINGERS, as the existing comment says it should, instead of writing to state->fingers[-1].

Severity

8.4 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80574"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-26T15:17:13Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: focaltech - fix array out-of-bounds in focaltech_process_rel_packet\n\nMake finger2 (and also finger1) unsigned, so that if the finger index in\nthe packet is 0 then subtracting 1 creates an array index which overflows\nabove the existing check for FOC_MAX_FINGERS, as the existing comment says\nit should, instead of writing to state-\u003efingers[-1].",
  "id": "GHSA-qm8h-24xg-3v98",
  "modified": "2026-08-27T06:31:32Z",
  "published": "2026-08-27T06:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80574"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/063b4c6a6f3fc01bca085c442000c9c100fdbd93"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1842e47126816e56d30c4f856f9854fd7831066c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/296736076b3fd078742651c719555a488624023a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f6d5fe29efdf5001bc146fc292e6592cace93eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81b07470cb2937ceb74b00be88151582a322433b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83c265bfc084d77e2171d4b67362150ab38c935b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb502d79acb9ac1e0a77fa8bc7b7b4729140b11f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca92c98b806839c108995b2bbff7061515bdfb53"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-80574 (GCVE-0-2026-80574)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:01

Title

Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet

Summary

In the Linux kernel, the following vulnerability has been resolved: Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet Make finger2 (and also finger1) unsigned, so that if the finger index in the packet is 0 then subtracting 1 creates an array index which overflows above the existing check for FOC_MAX_FINGERS, as the existing comment says it should, instead of writing to state->fingers[-1].

Severity

8.4 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/063b4c6a6f3fc01bc…
https://git.kernel.org/stable/c/bb502d79acb9ac1e0…
https://git.kernel.org/stable/c/ca92c98b806839c10…
https://git.kernel.org/stable/c/81b07470cb2937ceb…
https://git.kernel.org/stable/c/6f6d5fe29efdf5001…
https://git.kernel.org/stable/c/83c265bfc084d77e2…
https://git.kernel.org/stable/c/1842e47126816e56d…
https://git.kernel.org/stable/c/296736076b3fd0787…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 05be1d079ec0b3691783e4384b1ada82149ff7d2 , < 063b4c6a6f3fc01bca085c442000c9c100fdbd93 (git) Affected: 05be1d079ec0b3691783e4384b1ada82149ff7d2 , < bb502d79acb9ac1e0a77fa8bc7b7b4729140b11f (git) Affected: 05be1d079ec0b3691783e4384b1ada82149ff7d2 , < ca92c98b806839c108995b2bbff7061515bdfb53 (git) Affected: 05be1d079ec0b3691783e4384b1ada82149ff7d2 , < 81b07470cb2937ceb74b00be88151582a322433b (git) Affected: 05be1d079ec0b3691783e4384b1ada82149ff7d2 , < 6f6d5fe29efdf5001bc146fc292e6592cace93eb (git) Affected: 05be1d079ec0b3691783e4384b1ada82149ff7d2 , < 83c265bfc084d77e2171d4b67362150ab38c935b (git) Affected: 05be1d079ec0b3691783e4384b1ada82149ff7d2 , < 1842e47126816e56d30c4f856f9854fd7831066c (git) Affected: 05be1d079ec0b3691783e4384b1ada82149ff7d2 , < 296736076b3fd078742651c719555a488624023a (git)
Linux	Linux	Affected: 4.0 Unaffected: 0 , < 4.0 (semver) Unaffected: 5.10.266 , ≤ 5.10.* (semver) Unaffected: 5.15.217 , ≤ 5.15.* (semver) Unaffected: 6.1.184 , ≤ 6.1.* (semver) Unaffected: 6.6.153 , ≤ 6.6.* (semver) Unaffected: 6.12.105 , ≤ 6.12.* (semver) Unaffected: 6.18.46 , ≤ 6.18.* (semver) Unaffected: 7.1.10 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/mouse/focaltech.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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            {
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              "version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
              "versionType": "git"
            },
            {
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              "version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
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              "versionType": "git"
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            {
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.0"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.266",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.105",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.46",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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              "cpeMatch": [
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                },
                {
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                },
                {
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                  "versionEndExcluding": "7.1.10",
                  "versionStartIncluding": "4.0",
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                },
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: focaltech - fix array out-of-bounds in focaltech_process_rel_packet\n\nMake finger2 (and also finger1) unsigned, so that if the finger index in\nthe packet is 0 then subtracting 1 creates an array index which overflows\nabove the existing check for FOC_MAX_FINGERS, as the existing comment says\nit should, instead of writing to state-\u003efingers[-1]."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - FocalTech FOC_REL packets reach focaltech_process_rel_packet through i8042/serio hardware interrupts, ps2_interrupt, psmouse_receive_byte, and focaltech_process_byte with no syscall gate; any local user on a laptop with an integrated FocalTech PS/2 touchpad can deliver the triggering bytes by normal touchpad use.\nAC:L - When the second relative finger index is 0, a documented valid case for odd finger counts, signed underflow makes finger2 -1 pass the FOC_MAX_FINGERS bound test and causes a reliable out-of-bounds write on every such packet without races or attacker-uncontrollable memory layout.\nPR:N - No Linux account, capability, or namespace privilege is required; the integrated touchpad feeds bytes directly into the kernel interrupt handler during normal operation, including at the login screen before authentication.\nUI:N - An attacker with brief local access can trigger the corrupting multitouch gestures directly on the touchpad; exploitation does not depend on a separate victim performing an unusual action beyond touching the device.\nS:U - The vulnerability corrupts kmalloc-allocated focaltech_data within the host kernel psmouse driver; impact is standard in-kernel memory corruption rather than crossing a guest/host, VM, or IOMMU security boundary.\nC:H - Out-of-bounds += writes to fingers[-1].x and fingers[-1].y corrupt adjacent focaltech_data fields such as y_max in kernel heap memory; this class of heap corruption can be leveraged for kernel information disclosure.\nI:H - Attacker-influenced PS/2 packet bytes supply signed 8-bit deltas that repeatedly perform out-of-bounds writes immediately before fingers[0], enabling progressive corruption of neighboring driver state and potential privilege escalation.\nA:H - Corrupting kmalloc-allocated driver state via fingers[-1] can destabilize the input subsystem or adjacent heap objects, causing kernel oops, panic, or repeatable denial of service on affected laptops."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T05:01:56.362Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/063b4c6a6f3fc01bca085c442000c9c100fdbd93"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb502d79acb9ac1e0a77fa8bc7b7b4729140b11f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca92c98b806839c108995b2bbff7061515bdfb53"
        },
        {
          "url": "https://git.kernel.org/stable/c/81b07470cb2937ceb74b00be88151582a322433b"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f6d5fe29efdf5001bc146fc292e6592cace93eb"
        },
        {
          "url": "https://git.kernel.org/stable/c/83c265bfc084d77e2171d4b67362150ab38c935b"
        },
        {
          "url": "https://git.kernel.org/stable/c/1842e47126816e56d30c4f856f9854fd7831066c"
        },
        {
          "url": "https://git.kernel.org/stable/c/296736076b3fd078742651c719555a488624023a"
        }
      ],
      "title": "Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80574",
    "datePublished": "2026-08-26T14:37:34.353Z",
    "dateReserved": "2026-08-26T14:34:25.768Z",
    "dateUpdated": "2026-08-27T05:01:56.362Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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