Input: synaptics-rmi4 - bound the F3A keymap to the GPIO count

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64277
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:08 UTC
Updated2026-07-30 15:00:27 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Input: synaptics-rmi4 - bound the F3A keymap to the GPIO count rmi_f3a_initialize() takes the GPIO count from the device query register (f3a->gpio_count = buf & RMI_F3A_GPIO_COUNT, range 0..127). rmi_f3a_map_gpios() then allocates gpio_key_map with min(gpio_count, TRACKSTICK_RANGE_END) == at most 6 entries, but rmi_f3a_attention() iterates the full gpio_count and dereferences gpio_key_map[i], and input->keycodemax is set to the full gpio_count while input->keycode points at the 6-entry allocation. A device that reports gpio_count > 6 therefore causes an out-of-bounds read of gpio_key_map[] on every attention interrupt, and out-of-bounds accesses through the input core's default keymap ioctls: EVIOCGKEYCODE reads past the buffer (leaking adjacent slab memory to user space) and EVIOCSKEYCODE writes a caller-controlled value past it, for any process able to open the evdev node, since input_default_getkeycode() and input_default_setkeycode() only bound the index against keycodemax. Size the keymap for the full gpio_count. The mapping loop is unchanged: it still assigns only the first min(gpio_count, TRACKSTICK_RANGE_END) entries; the remaining slots stay KEY_RESERVED (devm_kcalloc zero-fills) and are skipped when reporting.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001640000 probability, percentile 0.060520000 (date 2026-08-03)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9e4c596bfd004f447a652205163234dfd4aafa69 502ad7caaa1a445b734c827fa256e5311df67e3d git Not specified
CNA Linux Linux affected 9e4c596bfd004f447a652205163234dfd4aafa69 3480e24bc4e178aaa009edb25b6ee12df199e210 git Not specified
CNA Linux Linux affected 9e4c596bfd004f447a652205163234dfd4aafa69 35ed74d32d8260bdfb14a94caf402bf0866bdeec git Not specified
CNA Linux Linux affected 9e4c596bfd004f447a652205163234dfd4aafa69 ba57f430328534501962d60d651e385ffd7af9ca git Not specified
CNA Linux Linux affected 9e4c596bfd004f447a652205163234dfd4aafa69 850117b637bcb1dcc14be0cf09ac819a8707b42c git Not specified
CNA Linux Linux affected 9e4c596bfd004f447a652205163234dfd4aafa69 8db211aed83733073b0814adaeeab61d4521474e git Not specified
CNA Linux Linux affected 9e4c596bfd004f447a652205163234dfd4aafa69 64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42 git Not specified
CNA Linux Linux affected 9e4c596bfd004f447a652205163234dfd4aafa69 57c10915f2c16c90e0d46ad00876bf39ece40fc2 git Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8db211aed83733073b0814adaeeab61d4521474e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3480e24bc4e178aaa009edb25b6ee12df199e210 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ba57f430328534501962d60d651e385ffd7af9ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/502ad7caaa1a445b734c827fa256e5311df67e3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/850117b637bcb1dcc14be0cf09ac819a8707b42c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/57c10915f2c16c90e0d46ad00876bf39ece40fc2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35ed74d32d8260bdfb14a94caf402bf0866bdeec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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