CVE-2026-80574 (GCVE-0-2026-80574)
Vulnerability from cvelistv5
Published
2026-08-26 14:37
Modified
2026-08-27 05:01
Severity ?
VLAI Severity ?
EPSS score ?
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].
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 05be1d079ec0b3691783e4384b1ada82149ff7d2 Version: 05be1d079ec0b3691783e4384b1ada82149ff7d2 Version: 05be1d079ec0b3691783e4384b1ada82149ff7d2 Version: 05be1d079ec0b3691783e4384b1ada82149ff7d2 Version: 05be1d079ec0b3691783e4384b1ada82149ff7d2 Version: 05be1d079ec0b3691783e4384b1ada82149ff7d2 Version: 05be1d079ec0b3691783e4384b1ada82149ff7d2 Version: 05be1d079ec0b3691783e4384b1ada82149ff7d2 |
||
{
"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",
"versions": [
{
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"status": "affected",
"version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
"versionType": "git"
},
{
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"status": "affected",
"version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
"versionType": "git"
},
{
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"status": "affected",
"version": "05be1d079ec0b3691783e4384b1ada82149ff7d2",
"versionType": "git"
},
{
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"status": "affected",
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{
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{
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"status": "affected",
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]
},
{
"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"
}
]
}
],
"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:*:*:*:*:*:*:*:*",
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{
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"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"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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