CVE-2026-64364 (GCVE-0-2026-64364)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-08-17 04:54
VLAI
EPSS
VEX
Title
HID: multitouch: fix out-of-bounds bit access on mt_io_flags
Summary
In the Linux kernel, the following vulnerability has been resolved:
HID: multitouch: fix out-of-bounds bit access on mt_io_flags
mt_io_flags is a single unsigned long, but mt_process_slot(),
mt_release_pending_palms() and mt_release_contacts() use it as a
per-slot bitmap indexed by the slot number. That slot number is only
bounded by td->maxcontacts, which is taken from the device's
ContactCountMaximum feature report and can be up to 255, not by
BITS_PER_LONG.
As a result, a multitouch device that advertises a large contact count
makes set_bit()/clear_bit() operate past the mt_io_flags word and
corrupt the adjacent members of struct mt_device. The sticky-fingers
release timer is the easiest way to reach this. mt_release_contacts()
runs
for (i = 0; i < mt->num_slots; i++)
clear_bit(i, &td->mt_io_flags);
with num_slots == maxcontacts. For maxcontacts around 250 the loop
clears the bits that overlap td->applications.next, zeroing that list
head, and the list_for_each_entry() that immediately follows then
dereferences NULL. The kernel panics from timer (softirq) context. On a
KASAN build this shows up as a general protection fault in
mt_release_contacts() with a null-ptr-deref at offset 0x58, which is
offsetof(struct mt_application, num_received).
The state is reachable from an untrusted USB or Bluetooth HID
multitouch device; no local privileges are required.
Store the per-slot active state in a separately allocated bitmap sized
for maxcontacts, the same pattern already used for pending_palm_slots,
and keep only MT_IO_FLAGS_RUNNING in mt_io_flags. The two
"mt_io_flags & MT_IO_SLOTS_MASK" arming checks become
bitmap_empty(td->active_slots, td->maxcontacts).
Move MT_IO_FLAGS_RUNNING back to bit 0. It was bumped to bit 32 by the
same commit to leave the low byte for the slot bits; with the slot bits
gone it fits in bit 0 again, which also keeps it within the unsigned
long on 32-bit.
Severity
8.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
fc488f675344931ffab6a51c43691065ec006567 , < 12e90656e330ff8bbaf2f29c535fdb8a11cc6f55
(git)
Affected: 77711d850bed75ae7142c3d1f22c1a8b4d049c33 , < 152983d87387f6a8ae72b73474cfa55fbcf1ec75 (git) Affected: 6acfe25968913788d30ec0eedd80178c4ea3f1d0 , < b5c037d6b807017e74a115288f81bc9cd5a5aab8 (git) Affected: d280c138e66be87d1fccfed42593f02fdb893905 , < a6d5ce2e1a2d7bf189bde8a659d04b65f0b0725d (git) Affected: f32fea4c0234c971c12e46d76612cdc2dd4bb046 , < e24918ee67c4dc3d20d4670750e46e9b160365f4 (git) Affected: 46f781e0d151844589dc2125c8cce3300546f92a , < 37daa8c96bd563d03150e23f094cb60703594a6d (git) Affected: 46f781e0d151844589dc2125c8cce3300546f92a , < 6493ebf9489efef0105078377b973ab33d51af22 (git) Affected: 46f781e0d151844589dc2125c8cce3300546f92a , < 8813b0612275cc61fe9e6603d0ee019247ade6be (git) Affected: 59bd04163e6451b9c7275277882ed9f4abfa2051 (git) Affected: 5.10.246 , < 5.10.261 (semver) Affected: 5.15.196 , < 5.15.212 (semver) Affected: 6.1.158 , < 6.1.178 (semver) Affected: 6.6.114 , < 6.6.145 (semver) Affected: 6.12.55 , < 6.12.97 (semver) Affected: 6.17.5 , < 6.18 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.18
Unaffected: 0 , < 6.18 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: multitouch: fix out-of-bounds bit access on mt_io_flags\n\nmt_io_flags is a single unsigned long, but mt_process_slot(),\nmt_release_pending_palms() and mt_release_contacts() use it as a\nper-slot bitmap indexed by the slot number. That slot number is only\nbounded by td-\u003emaxcontacts, which is taken from the device\u0027s\nContactCountMaximum feature report and can be up to 255, not by\nBITS_PER_LONG.\n\nAs a result, a multitouch device that advertises a large contact count\nmakes set_bit()/clear_bit() operate past the mt_io_flags word and\ncorrupt the adjacent members of struct mt_device. The sticky-fingers\nrelease timer is the easiest way to reach this. mt_release_contacts()\nruns\n\n\tfor (i = 0; i \u003c mt-\u003enum_slots; i++)\n\t\tclear_bit(i, \u0026td-\u003emt_io_flags);\n\nwith num_slots == maxcontacts. For maxcontacts around 250 the loop\nclears the bits that overlap td-\u003eapplications.next, zeroing that list\nhead, and the list_for_each_entry() that immediately follows then\ndereferences NULL. The kernel panics from timer (softirq) context. On a\nKASAN build this shows up as a general protection fault in\nmt_release_contacts() with a null-ptr-deref at offset 0x58, which is\noffsetof(struct mt_application, num_received).\n\nThe state is reachable from an untrusted USB or Bluetooth HID\nmultitouch device; no local privileges are required.\n\nStore the per-slot active state in a separately allocated bitmap sized\nfor maxcontacts, the same pattern already used for pending_palm_slots,\nand keep only MT_IO_FLAGS_RUNNING in mt_io_flags. The two\n\"mt_io_flags \u0026 MT_IO_SLOTS_MASK\" arming checks become\nbitmap_empty(td-\u003eactive_slots, td-\u003emaxcontacts).\n\nMove MT_IO_FLAGS_RUNNING back to bit 0. It was bumped to bit 32 by the\nsame commit to leave the low byte for the slot bits; with the slot bits\ngone it fits in bit 0 again, which also keeps it within the unsigned\nlong on 32-bit."
}
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"version": "3.1"
},
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"lang": "en",
"value": "AV:A - A malicious Bluetooth HID multitouch peripheral within radio range can supply the descriptor, feature value, and input reports; malicious USB devices provide an additional physical path.\nAC:L - Advertising 250 contacts, sending one active contact, and remaining silent for 100 ms deterministically triggers the timer path without a race, heap grooming, or uncontrollable condition.\nPR:N - The external HID device needs no target-system account or capability, and normal HID connection handling delivers its attacker-controlled data to the driver.\nUI:N - An already-connected or automatically reconnecting Bluetooth peripheral can trigger the flaw without victim action; report processing itself requires no file, prompt, or application interaction.\nS:U - The corruption occurs in the host kernel and compromises resources governed by that same kernel security authority.\nC:H - Attacker-controlled out-of-bounds bit operations cover adjacent list pointers and can redirect subsequent kernel memory accesses, supporting kernel compromise and arbitrary disclosure.\nI:H - The device obtains attacker-directed set/clear operations over adjacent pointer fields, enabling crafted pointer corruption, further kernel writes, and potentially code execution.\nA:H - The deterministic timeout path corrupts the applications list and causes a kernel panic from softirq context, and a malicious peripheral can trigger it repeatedly."
}
]
}
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{
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"title": "HID: multitouch: fix out-of-bounds bit access on mt_io_flags",
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"date": "2026-10-03",
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"initial_release_date": "2026-07-26T01:10:39.000Z",
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"title": "HID: multitouch: fix out-of-bounds bit access on mt_io_flags",
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: multitouch: fix out-of-bounds bit access on mt_io_flags\n\nmt_io_flags is a single unsigned long, but mt_process_slot(),\nmt_release_pending_palms() and mt_release_contacts() use it as a\nper-slot bitmap indexed by the slot number. That slot number is only\nbounded by td-\u003emaxcontacts, which is taken from the device\u0027s\nContactCountMaximum feature report and can be up to 255, not by\nBITS_PER_LONG.\n\nAs a result, a multitouch device that advertises a large contact count\nmakes set_bit()/clear_bit() operate past the mt_io_flags word and\ncorrupt the adjacent members of struct mt_device. The sticky-fingers\nrelease timer is the easiest way to reach this. mt_release_contacts()\nruns\n\n\tfor (i = 0; i \u003c mt-\u003enum_slots; i++)\n\t\tclear_bit(i, \u0026td-\u003emt_io_flags);\n\nwith num_slots == maxcontacts. For maxcontacts around 250 the loop\nclears the bits that overlap td-\u003eapplications.next, zeroing that list\nhead, and the list_for_each_entry() that immediately follows then\ndereferences NULL. The kernel panics from timer (softirq) context. On a\nKASAN build this shows up as a general protection fault in\nmt_release_contacts() with a null-ptr-deref at offset 0x58, which is\noffsetof(struct mt_application, num_received).\n\nThe state is reachable from an untrusted USB or Bluetooth HID\nmultitouch device; no local privileges are required.\n\nStore the per-slot active state in a separately allocated bitmap sized\nfor maxcontacts, the same pattern already used for pending_palm_slots,\nand keep only MT_IO_FLAGS_RUNNING in mt_io_flags. The two\n\"mt_io_flags \u0026 MT_IO_SLOTS_MASK\" arming checks become\nbitmap_empty(td-\u003eactive_slots, td-\u003emaxcontacts).\n\nMove MT_IO_FLAGS_RUNNING back to bit 0. It was bumped to bit 32 by the\nsame commit to leave the low byte for the slot bits; with the slot bits\ngone it fits in bit 0 again, which also keeps it within the unsigned\nlong on 32-bit."
}
],
"id": "CVE-2026-64364",
"lastModified": "2026-09-10T21:35:45.760",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-07-25T10:17:19.110",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/12e90656e330ff8bbaf2f29c535fdb8a11cc6f55"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/152983d87387f6a8ae72b73474cfa55fbcf1ec75"
},
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"url": "https://git.kernel.org/stable/c/37daa8c96bd563d03150e23f094cb60703594a6d"
},
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"url": "https://git.kernel.org/stable/c/6493ebf9489efef0105078377b973ab33d51af22"
},
{
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},
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},
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},
{
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"tags": [
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"url": "https://git.kernel.org/stable/c/e24918ee67c4dc3d20d4670750e46e9b160365f4"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-07-29T10:20:37+00:00",
"cve": "CVE-2026-64364",
"id": "CVE-2026-64364",
"initial_release_date": "2026-07-25T00:00:00+00:00",
"product_status:known_not_affected": "261",
"product_status:under_investigation": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: HID: multitouch: fix out-of-bounds bit access on mt_io_flags",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64364.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-03T00:45:33Z",
"cve": "CVE-2026-64364",
"id": "CVE-2026-64364",
"initial_release_date": "2026-07-25T16:00:55Z",
"product_status:known_affected": "31",
"product_status:known_not_affected": "347",
"product_status:recommended": "149",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64364",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64364.json",
"version": "9"
}
}
}
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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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