CVE-2026-64243

Kernel data exposure and crash via off-by-one index

Published Jul 24, 2026 · Updated Jul 24, 2026

Improper array-index validation in the ASoC simple-mux driver allows local users to expose kernel data or crash the system. simple_mux_control_put() accepts the zero-based enum value e->items, stores the invalid mux state, and passes it to the DAPM path as an index into the enum text array. Exploitation requires low-privileged local access to an affected ALSA control device; the resulting out-of-bounds access exposes kernel memory or interrupts service through a system crash.

CVSS severity7.1
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper array-index validation in the ASoC simple-mux driver allows local users to expose kernel data or crash the system. simple_mux_control_put() accepts the zero-based enum value e->items, stores the invalid mux state, and passes it to the DAPM path as an index into the enum text array. Exploitation requires low-privileged local access to an affected ALSA control device; the resulting out-of-bounds access exposes kernel memory or interrupts service through a system crash.

The record

CVE
CVE-2026-64243
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=342fbb7578d1741ff646d7b08e14e8753267b9fa <05ef77f02607a3dc5d7f9762cb990f76843315d4
  2. Affected versionversion=342fbb7578d1741ff646d7b08e14e8753267b9fa <164dcbec9632ca93ae313e6da6e4e05584fa0f02
  3. Affected versionversion=342fbb7578d1741ff646d7b08e14e8753267b9fa <2ff3ac6f7664fe5639cad01712ac5e021fa7939c
  4. Affected versionversion=342fbb7578d1741ff646d7b08e14e8753267b9fa <5fe860af8630cf7c78523cbd68e5a234743585aa
  5. Affected versionversion=342fbb7578d1741ff646d7b08e14e8753267b9fa <6fb653b62f169f6050fac45b56bf21ad097e19f6
  6. Affected versionversion=342fbb7578d1741ff646d7b08e14e8753267b9fa <d8cc3e747b002a8b965c529de79c0654675b9a1a
  7. Affected versionversion=342fbb7578d1741ff646d7b08e14e8753267b9fa <f63ad68e18d774a5d15cd7e405ead63f6b322679
  8. Affected versionversion=5.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=342fbb7578d1741ff646d7b08e14e8753267b9fa <05ef77f02607a3dc5d7f9762cb990f76843315d4; version=342fbb7578d1741ff646d7b08e14e8753267b9fa <164dcbec9632ca93ae313e6da6e4e05584fa0f02; version=342fbb7578d1741ff646d7b08e14e8753267b9fa <2ff3ac6f7664fe5639cad01712ac5e021fa7939c; version=342fbb7578d1741ff646d7b08e14e8753267b9fa <5fe860af8630cf7c78523cbd68e5a234743585aa; version=342fbb7578d1741ff646d7b08e14e8753267b9fa <6fb653b62f169f6050fac45b56bf21ad097e19f6; version=342fbb7578d1741ff646d7b08e14e8753267b9fa <d8cc3e747b002a8b965c529de79c0654675b9a1a; version=342fbb7578d1741ff646d7b08e14e8753267b9fa <f63ad68e18d774a5d15cd7e405ead63f6b322679; version=5.11

Published CVSS scores

7.1LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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

T1005Data from Local System

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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