CVE-2024-43879

Kernel warning via unhandled 2x996 RU allocation

Published Aug 21, 2024 · Updated May 12, 2026

Improper input validation in Linux cfg80211 allows local users to trigger a kernel warning through a 2x996 HE RU allocation. cfg80211_calculate_bitrate_he() rejects the defined NL80211_RATE_INFO_HE_RU_ALLOC_2x996 value instead of calculating it like 160 MHz bandwidth. Exploitation requires low-privileged local access and an HE wireless rate report using that allocation; the warning affects Linux and the Siemens GNU/Linux subsystem.

CVSS severity5.5
Medium
EPSS probability0.22%
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 cfg80211 allows local users to trigger a kernel warning through a 2x996 HE RU allocation. cfg80211_calculate_bitrate_he() rejects the defined NL80211_RATE_INFO_HE_RU_ALLOC_2x996 value instead of calculating it like 160 MHz bandwidth. Exploitation requires low-privileged local access and an HE wireless rate report using that allocation; the warning affects Linux and the Siemens GNU/Linux subsystem.

The record

CVE
CVE-2024-43879
Published
Aug 21, 2024
Updated
May 12, 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. Aug 21, 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=4.19; version=c4cbaf7973a794839af080f13748335976cf3f3f <16ad67e73309db0c20cc2a651992bd01c05e6b27; version=c4cbaf7973a794839af080f13748335976cf3f3f <19eaf4f2f5a981f55a265242ada2bf92b0c742dd; version=c4cbaf7973a794839af080f13748335976cf3f3f <2e201b3d162c6c49417c438ffb30b58c9f85769f; version=c4cbaf7973a794839af080f13748335976cf3f3f <45d20a1c54be4f3173862c7b950d4468447814c9; version=c4cbaf7973a794839af080f13748335976cf3f3f <576c64622649f3ec07e97bac8fec8b8a2ef4d086; version=c4cbaf7973a794839af080f13748335976cf3f3f <67b5f1054197e4f5553047759c15c1d67d4c8142; version=c4cbaf7973a794839af080f13748335976cf3f3f <b289ebb0516526cb4abae081b7ec29fd4fa1209d; version=c4cbaf7973a794839af080f13748335976cf3f3f <bcbd771cd5d68c0c52567556097d75f9fc4e7cd6

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS: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

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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-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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