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

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:01
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
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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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          "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]."
        }
      ],
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            "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": [
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              "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."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-27T05:01:56.362Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/bb502d79acb9ac1e0a77fa8bc7b7b4729140b11f"
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        {
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    "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"
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      "initial_release_date": "2026-08-27T01:09:09.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80574.json",
      "version": "1"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T14:55:05+00:00",
      "cve": "CVE-2026-80574",
      "id": "CVE-2026-80574",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80574.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:11:18Z",
      "cve": "CVE-2026-80574",
      "id": "CVE-2026-80574",
      "initial_release_date": "2026-08-27T00:11:35Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80574",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80574.json",
      "version": "7"
    }
  }
}



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