CVE-2026-64276

Kernel heap read and write via undersized keymap

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds access in the Linux Kernel allows local users to read or write kernel heap memory through evdev keycode ioctls. rmi_f30_map_gpios() allocates at most six keymap entries while keycodemax and rmi_f30_attention() use the device-reported GPIO/LED count of up to 31. Reachability requires an affected Synaptics RMI4 F30 device with GPIO support and permission to open its event node; crafted indices trigger two-byte heap reads or writes.

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 the Linux Kernel allows local users to read or write kernel heap memory through evdev keycode ioctls. rmi_f30_map_gpios() allocates at most six keymap entries while keycodemax and rmi_f30_attention() use the device-reported GPIO/LED count of up to 31. Reachability requires an affected Synaptics RMI4 F30 device with GPIO support and permission to open its event node; crafted indices trigger two-byte heap reads or writes.

The record

CVE
CVE-2026-64276
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
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=3e64fcbdbd10e46dede502d507dbcc104837cd59 <26c895928d7118436a24f564587cb4aefc40cdd8
  2. Affected versionversion=3e64fcbdbd10e46dede502d507dbcc104837cd59 <4e3689c26854356f41fbaa1eafa382e58ac79e00
  3. Affected versionversion=3e64fcbdbd10e46dede502d507dbcc104837cd59 <8c6d18d61bb6fe0e6edf848413391c590552e8a9
  4. Affected versionversion=3e64fcbdbd10e46dede502d507dbcc104837cd59 <bfe622efecd4ff0a792d0ecd1a8dce535a902f50
  5. Affected versionversion=3e64fcbdbd10e46dede502d507dbcc104837cd59 <d162a1ead7de404d8b41a093c83ed0db6487cded
  6. Affected versionversion=3e64fcbdbd10e46dede502d507dbcc104837cd59 <d577e46785d45484b2ab7e7309c49b18764bf56c
  7. Affected versionversion=3e64fcbdbd10e46dede502d507dbcc104837cd59 <e849c6f51e6877104c765da084e001ec37c8e119
  8. Affected versionversion=3e64fcbdbd10e46dede502d507dbcc104837cd59 <f0be9eba946e9200b43265e0a748d38bd0a56954
  9. Affected versionversion=4.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3e64fcbdbd10e46dede502d507dbcc104837cd59 <26c895928d7118436a24f564587cb4aefc40cdd8; version=3e64fcbdbd10e46dede502d507dbcc104837cd59 <4e3689c26854356f41fbaa1eafa382e58ac79e00; version=3e64fcbdbd10e46dede502d507dbcc104837cd59 <8c6d18d61bb6fe0e6edf848413391c590552e8a9; version=3e64fcbdbd10e46dede502d507dbcc104837cd59 <bfe622efecd4ff0a792d0ecd1a8dce535a902f50; version=3e64fcbdbd10e46dede502d507dbcc104837cd59 <d162a1ead7de404d8b41a093c83ed0db6487cded; version=3e64fcbdbd10e46dede502d507dbcc104837cd59 <d577e46785d45484b2ab7e7309c49b18764bf56c; version=3e64fcbdbd10e46dede502d507dbcc104837cd59 <e849c6f51e6877104c765da084e001ec37c8e119; version=3e64fcbdbd10e46dede502d507dbcc104837cd59 <f0be9eba946e9200b43265e0a748d38bd0a56954; version=4.14

Published CVSS scores

7.8Linux kernel CVE teamCVSS: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

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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