CVE-2024-50205

Local service interruption via zero step division

Published Nov 8, 2024 · Updated May 12, 2026

Divide-by-zero in the ALSA FireWire library in affected Linux kernels allows local users to interrupt service during PCM setup. apply_constraint_to_size() initializes step to zero and divides by it when no amdtp_rate_table interval satisfies snd_interval_test(). A low-privileged local user must reach the ALSA FireWire PCM constraint path; the resulting kernel fault affects availability without reported data access or modification.

CVSS severity5.5
Medium
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

Divide-by-zero in the ALSA FireWire library in affected Linux kernels allows local users to interrupt service during PCM setup. apply_constraint_to_size() initializes step to zero and divides by it when no amdtp_rate_table interval satisfies snd_interval_test(). A low-privileged local user must reach the ALSA FireWire PCM constraint path; the resulting kernel fault affects availability without reported data access or modification.

The record

CVE
CVE-2024-50205
Published
Nov 8, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-369, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 8, 2024CVE publishedPublication date reported by the CVE source.
  2. May 12, 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=4.20; version=826b5de90c0bca4e9de6231da9e1730480621588 <3452d39c4704aa12504e4190298c721fb01083c3; version=826b5de90c0bca4e9de6231da9e1730480621588 <4bdc21506f12b2d432b1f2667e5ff4c75eee58e3; version=826b5de90c0bca4e9de6231da9e1730480621588 <5e431f85c87bbffd93a9830d5a576586f9855291; version=826b5de90c0bca4e9de6231da9e1730480621588 <72cafe63b35d06b5cfbaf807e90ae657907858da; version=826b5de90c0bca4e9de6231da9e1730480621588 <7d4eb9e22131ec154e638cbd56629195c9bcbe9a; version=826b5de90c0bca4e9de6231da9e1730480621588 <d2826873db70a6719cdd9212a6739f3e6234cfc4; version=826b5de90c0bca4e9de6231da9e1730480621588 <d575414361630b8b0523912532fcd7c79e43468c

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/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.

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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

CWE-369Divide By Zero
T1499Endpoint Denial of Service

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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