CVE-2026-64364
HID: multitouch: fix out-of-bounds bit access on mt_io_flags
Description
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.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the patch for HID: multitouch memory corruption.
- Update the Linux kernel to the latest stable version.
- Rebuild the kernel with the fix applied.
- Deploy the updated kernel to affected systems.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64364.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64364 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64364
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64364 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64364 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'fc488f675344931ffab6a51c43691065ec006567', 'lessThan': '12e90656e330ff8bbaf2f29c535fdb8a11cc6f55', 'versionType': 'git'}, {'status': 'affected', 'version': '77711d850bed75ae7142c3d1f22c1a8b4d049c33', 'lessThan': '152983d87387f6a8ae72b73474cfa55fbcf1ec75', 'versionType': 'git'}, {'status': 'affected', 'version': '6acfe25968913788d30ec0eedd80178c4ea3f1d0', 'lessThan': 'b5c037d6b807017e74a115288f81bc9cd5a5aab8', 'versionType': 'git'}, {'status': 'affected', 'version': 'd280c138e66be87d1fccfed42593f02fdb893905', 'lessThan': 'a6d5ce2e1a2d7bf189bde8a659d04b65f0b0725d', 'versionType': 'git'}, {'status': 'affected', 'version': 'f32fea4c0234c971c12e46d76612cdc2dd4bb046', 'lessThan': 'e24918ee67c4dc3d20d4670750e46e9b160365f4', 'versionType': 'git'}, {'status': 'affected', 'version': '46f781e0d151844589dc2125c8cce3300546f92a', 'lessThan': '37daa8c96bd563d03150e23f094cb60703594a6d', 'versionType': 'git'}, {'status': 'affected', 'version': '46f781e0d151844589dc2125c8cce3300546f92a', 'lessThan': '6493ebf9489efef0105078377b973ab33d51af22', 'versionType': 'git'}, {'status': 'affected', 'version': '46f781e0d151844589dc2125c8cce3300546f92a', 'lessThan': '8813b0612275cc61fe9e6603d0ee019247ade6be', 'versionType': 'git'}, {'status': 'affected', 'version': '59bd04163e6451b9c7275277882ed9f4abfa2051', 'versionType': 'git'}, {'status': 'affected', 'version': '5.10.246', 'lessThan': '5.10.261', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.15.196', 'lessThan': '5.15.212', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.1.158', 'lessThan': '6.1.178', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.114', 'lessThan': '6.6.145', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.55', 'lessThan': '6.12.97', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.17.5', 'lessThan': '6.18', 'versionType': 'semver'}], 'programFiles': ['drivers/hid/hid-multitouch.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/hid/hid-multitouch.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'fc488f675344931ffab6a51c43691065ec006567', 'lessThan': '12e90656e330ff8bbaf2f29c535fdb8a11cc6f55', 'versionType': 'git'}, {'status': 'affected', 'version': '77711d850bed75ae7142c3d1f22c1a8b4d049c33', 'lessThan': '152983d87387f6a8ae72b73474cfa55fbcf1ec75', 'versionType': 'git'}, {'status': 'affected', 'version': '6acfe25968913788d30ec0eedd80178c4ea3f1d0', 'lessThan': 'b5c037d6b807017e74a115288f81bc9cd5a5aab8', 'versionType': 'git'}, {'status': 'affected', 'version': 'd280c138e66be87d1fccfed42593f02fdb893905', 'lessThan': 'a6d5ce2e1a2d7bf189bde8a659d04b65f0b0725d', 'versionType': 'git'}, {'status': 'affected', 'version': 'f32fea4c0234c971c12e46d76612cdc2dd4bb046', 'lessThan': 'e24918ee67c4dc3d20d4670750e46e9b160365f4', 'versionType': 'git'}, {'status': 'affected', 'version': '46f781e0d151844589dc2125c8cce3300546f92a', 'lessThan': '37daa8c96bd563d03150e23f094cb60703594a6d', 'versionType': 'git'}, {'status': 'affected', 'version': '46f781e0d151844589dc2125c8cce3300546f92a', 'lessThan': '6493ebf9489efef0105078377b973ab33d51af22', 'versionType': 'git'}, {'status': 'affected', 'version': '46f781e0d151844589dc2125c8cce3300546f92a', 'lessThan': '8813b0612275cc61fe9e6603d0ee019247ade6be', 'versionType': 'git'}, {'status': 'affected', 'version': '59bd04163e6451b9c7275277882ed9f4abfa2051', 'versionType': 'git'}, {'status': 'affected', 'version': '5.10.246', 'lessThan': '5.10.261', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.15.196', 'lessThan': '5.15.212', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.1.158', 'lessThan': '6.1.178', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.114', 'lessThan': '6.6.145', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.55', 'lessThan': '6.12.97', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.17.5', 'lessThan': '6.18', 'versionType': 'semver'}], 'programFiles': ['drivers/hid/hid-multitouch.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/hid/hid-multitouch.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'fc488f675344931ffab6a51c43691065ec006567', 'lessThan': '12e90656e330ff8bbaf2f29c535fdb8a11cc6f55', 'versionType': 'git'}, {'status': 'affected', 'version': '77711d850bed75ae7142c3d1f22c1a8b4d049c33', 'lessThan': '152983d87387f6a8ae72b73474cfa55fbcf1ec75', 'versionType': 'git'}, {'status': 'affected', 'version': '6acfe25968913788d30ec0eedd80178c4ea3f1d0', 'lessThan': 'b5c037d6b807017e74a115288f81bc9cd5a5aab8', 'versionType': 'git'}, {'status': 'affected', 'version': 'd280c138e66be87d1fccfed42593f02fdb893905', 'lessThan': 'a6d5ce2e1a2d7bf189bde8a659d04b65f0b0725d', 'versionType': 'git'}, {'status': 'affected', 'version': 'f32fea4c0234c971c12e46d76612cdc2dd4bb046', 'lessThan': 'e24918ee67c4dc3d20d4670750e46e9b160365f4', 'versionType': 'git'}, {'status': 'affected', 'version': '46f781e0d151844589dc2125c8cce3300546f92a', 'lessThan': '37daa8c96bd563d03150e23f094cb60703594a6d', 'versionType': 'git'}, {'status': 'affected', 'version': '46f781e0d151844589dc2125c8cce3300546f92a', 'lessThan': '6493ebf9489efef0105078377b973ab33d51af22', 'versionType': 'git'}, {'status': 'affected', 'version': '46f781e0d151844589dc2125c8cce3300546f92a', 'lessThan': '8813b0612275cc61fe9e6603d0ee019247ade6be', 'versionType': 'git'}, {'status': 'affected', 'version': '59bd04163e6451b9c7275277882ed9f4abfa2051', 'versionType': 'git'}, {'status': 'affected', 'version': '5.10.246', 'lessThan': '5.10.261', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.15.196', 'lessThan': '5.15.212', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.1.158', 'lessThan': '6.1.178', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.114', 'lessThan': '6.6.145', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.55', 'lessThan': '6.12.97', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.17.5', 'lessThan': '6.18', 'versionType': 'semver'}], 'programFiles': ['drivers/hid/hid-multitouch.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/hid/hid-multitouch.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/12e90656e330ff8bbaf2f29c535fdb8a11cc6f55 Added Reference https://git.kernel.org/stable/c/152983d87387f6a8ae72b73474cfa55fbcf1ec75 Added Reference https://git.kernel.org/stable/c/37daa8c96bd563d03150e23f094cb60703594a6d Added Reference https://git.kernel.org/stable/c/6493ebf9489efef0105078377b973ab33d51af22 Added Reference https://git.kernel.org/stable/c/8813b0612275cc61fe9e6603d0ee019247ade6be Added Reference https://git.kernel.org/stable/c/a6d5ce2e1a2d7bf189bde8a659d04b65f0b0725d Added Reference https://git.kernel.org/stable/c/b5c037d6b807017e74a115288f81bc9cd5a5aab8 Added Reference https://git.kernel.org/stable/c/e24918ee67c4dc3d20d4670750e46e9b160365f4