CVE-2026-80574 (GCVE-0-2026-80574)
Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:01
VLAI
EPSS
VEX
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)
Assigner
References
8 references
Impacted products
2 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) |
guessed | |
| 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) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"drivers/input/mouse/focaltech.c"
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},
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.0"
},
{
"lessThan": "4.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.266",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.184",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.153",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.266",
"versionStartIncluding": "4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.217",
"versionStartIncluding": "4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.184",
"versionStartIncluding": "4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.153",
"versionStartIncluding": "4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.105",
"versionStartIncluding": "4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.46",
"versionStartIncluding": "4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.10",
"versionStartIncluding": "4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "4.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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"
}
}
},
"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",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-80574",
"date": "2026-10-09",
"epss": "0.00196",
"percentile": "0.08472"
},
"microsoft_vex": {
"current_release_date": "2026-09-23T02:10:25.000Z",
"cve": "CVE-2026-80574",
"id": "msrc_CVE-2026-80574",
"initial_release_date": "2026-08-27T01:09:09.000Z",
"product_status:known_affected": "2",
"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": "2"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"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",
"versions": [
{
"lessThan": "063b4c6a6f3fc01bca085c442000c9c100fdbd93",
"status": "affected",
"version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
"versionType": "git"
},
{
"lessThan": "bb502d79acb9ac1e0a77fa8bc7b7b4729140b11f",
"status": "affected",
"version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
"versionType": "git"
},
{
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"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
"lessThan": "6f6d5fe29efdf5001bc146fc292e6592cace93eb",
"status": "affected",
"version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
"versionType": "git"
},
{
"lessThan": "83c265bfc084d77e2171d4b67362150ab38c935b",
"status": "affected",
"version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
"versionType": "git"
},
{
"lessThan": "1842e47126816e56d30c4f856f9854fd7831066c",
"status": "affected",
"version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
"versionType": "git"
},
{
"lessThan": "296736076b3fd078742651c719555a488624023a",
"status": "affected",
"version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/input/mouse/focaltech.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.0"
},
{
"lessThan": "4.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.266",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.184",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.153",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"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]."
}
],
"id": "CVE-2026-80574",
"lastModified": "2026-08-27T06:17:43.003",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 8.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.5,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-26T15:17:13.393",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/063b4c6a6f3fc01bca085c442000c9c100fdbd93"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/1842e47126816e56d30c4f856f9854fd7831066c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/296736076b3fd078742651c719555a488624023a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6f6d5fe29efdf5001bc146fc292e6592cace93eb"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/81b07470cb2937ceb74b00be88151582a322433b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/83c265bfc084d77e2171d4b67362150ab38c935b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/bb502d79acb9ac1e0a77fa8bc7b7b4729140b11f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ca92c98b806839c108995b2bbff7061515bdfb53"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"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": "2026-09-23T00:16:47Z",
"cve": "CVE-2026-80574",
"id": "CVE-2026-80574",
"initial_release_date": "2026-08-27T00:11:35Z",
"product_status:known_affected": "605",
"product_status:known_not_affected": "88",
"product_status:recommended": "23",
"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": "8"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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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.
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