CVE-2026-64277

Local kernel memory access via undersized F3A keymap

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds access in affected Linux Kernel releases allows local users to read or write kernel memory through evdev keymap ioctls. rmi_f3a_map_gpios() allocates at most six gpio_key_map entries, while keycodemax and rmi_f3a_attention() use the device-reported GPIO count of up to 127. Access requires an affected RMI F3A device reporting more than six GPIOs and permission to open its evdev node; reads leak adjacent slab data and writes corrupt it.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in affected Linux Kernel releases allows local users to read or write kernel memory through evdev keymap ioctls. rmi_f3a_map_gpios() allocates at most six gpio_key_map entries, while keycodemax and rmi_f3a_attention() use the device-reported GPIO count of up to 127. Access requires an affected RMI F3A device reporting more than six GPIOs and permission to open its evdev node; reads leak adjacent slab data and writes corrupt it.

The record

CVE
CVE-2026-64277
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, CAPEC-540, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.10
  2. Affected versionversion=9e4c596bfd004f447a652205163234dfd4aafa69 <3480e24bc4e178aaa009edb25b6ee12df199e210
  3. Affected versionversion=9e4c596bfd004f447a652205163234dfd4aafa69 <35ed74d32d8260bdfb14a94caf402bf0866bdeec
  4. Affected versionversion=9e4c596bfd004f447a652205163234dfd4aafa69 <502ad7caaa1a445b734c827fa256e5311df67e3d
  5. Affected versionversion=9e4c596bfd004f447a652205163234dfd4aafa69 <57c10915f2c16c90e0d46ad00876bf39ece40fc2
  6. Affected versionversion=9e4c596bfd004f447a652205163234dfd4aafa69 <64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42
  7. Affected versionversion=9e4c596bfd004f447a652205163234dfd4aafa69 <850117b637bcb1dcc14be0cf09ac819a8707b42c
  8. Affected versionversion=9e4c596bfd004f447a652205163234dfd4aafa69 <8db211aed83733073b0814adaeeab61d4521474e
  9. Affected versionversion=9e4c596bfd004f447a652205163234dfd4aafa69 <ba57f430328534501962d60d651e385ffd7af9ca

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.10; version=9e4c596bfd004f447a652205163234dfd4aafa69 <3480e24bc4e178aaa009edb25b6ee12df199e210; version=9e4c596bfd004f447a652205163234dfd4aafa69 <35ed74d32d8260bdfb14a94caf402bf0866bdeec; version=9e4c596bfd004f447a652205163234dfd4aafa69 <502ad7caaa1a445b734c827fa256e5311df67e3d; version=9e4c596bfd004f447a652205163234dfd4aafa69 <57c10915f2c16c90e0d46ad00876bf39ece40fc2; version=9e4c596bfd004f447a652205163234dfd4aafa69 <64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42; version=9e4c596bfd004f447a652205163234dfd4aafa69 <850117b637bcb1dcc14be0cf09ac819a8707b42c; version=9e4c596bfd004f447a652205163234dfd4aafa69 <8db211aed83733073b0814adaeeab61d4521474e; version=9e4c596bfd004f447a652205163234dfd4aafa69 <ba57f430328534501962d60d651e385ffd7af9ca

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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