CVE-2024-42097

Kernel memory corruption via unchecked patch length

Published Jul 29, 2024 · Updated Aug 5, 2026

Improper input validation in Linux ALSA emux allows local users to read or corrupt kernel memory and crash the system through patch loading. The load_guspatch() path trusts patch.len without confirming that the caller supplied that many bytes, while load_data() inconsistently validates and skips the main information block. Exploitation requires local access to an emux hardware-dependent or MIDI sequencer device; malformed lengths can drive out-of-bounds operations and a kernel crash.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Linux ALSA emux allows local users to read or corrupt kernel memory and crash the system through patch loading. The load_guspatch() path trusts patch.len without confirming that the caller supplied that many bytes, while load_data() inconsistently validates and skips the main information block. Exploitation requires local access to an emux hardware-dependent or MIDI sequencer device; malformed lengths can drive out-of-bounds operations and a kernel crash.

The record

CVE
CVE-2024-42097
Published
Jul 29, 2024
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-20, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=0 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <40d7def67841343c10f8642a41031fecbb248bab; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <79d9a000f0220cdaba1682d2a23c0d0c61d620a3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7a18293fd8d8519c2f7a03753bc1583b18e3db69; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <87039b83fb7bfd7d0e0499aaa8e6c049906b4d14; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89b32ccb12ae67e630c6453d778ec30a592a212f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0ff2443fcbb472206d45a5d2a90cc694065804e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d23982ea9aa438f35a8c8a6305943e98a8db90f6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d8f5ce3cb9adf0c72e2ad6089aba02d7a32469c2; version=2.6.12

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7Siemens ProductCERTCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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