CVE-2024-40912

Local kernel hang via softirq lock reentry

Published Jul 12, 2024 · Updated May 23, 2026

Improper locking in mac80211 in Linux and Siemens SIMATIC S7-1500 TM MFP allows local users to hang the kernel during Wi-Fi station wakeup. ieee80211_sta_ps_deliver_wakeup() takes sta->ps_lock with spin_lock(), leaving same-CPU softirqs enabled so ieee80211_tx_h_unicast_ps_buf() can re-enter and wait forever on that lock. The trigger requires low-privileged local access and an affected mac80211 Wi-Fi path; the observed consequence is an RCU stall that interrupts service.

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 locking in mac80211 in Linux and Siemens SIMATIC S7-1500 TM MFP allows local users to hang the kernel during Wi-Fi station wakeup. ieee80211_sta_ps_deliver_wakeup() takes sta->ps_lock with spin_lock(), leaving same-CPU softirqs enabled so ieee80211_tx_h_unicast_ps_buf() can re-enter and wait forever on that lock. The trigger requires low-privileged local access and an affected mac80211 Wi-Fi path; the observed consequence is an RCU stall that interrupts service.

The record

CVE
CVE-2024-40912
Published
Jul 12, 2024
Updated
May 23, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-667, CWE-20, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=1d147bfa64293b2723c4fec50922168658e613ba <28ba44d680a30c51cf485a2f5a3b680e66ed3932; version=1d147bfa64293b2723c4fec50922168658e613ba <44c06bbde6443de206b30f513100b5670b23fc5e; version=1d147bfa64293b2723c4fec50922168658e613ba <456bbb8a31e425177dc0e8d4f98728a560c20e81; version=1d147bfa64293b2723c4fec50922168658e613ba <47d176755d5c0baf284eff039560f8c1ba0ea485; version=1d147bfa64293b2723c4fec50922168658e613ba <9c49b58b9a2bed707e7638576e54c4bccd97b9eb; version=1d147bfa64293b2723c4fec50922168658e613ba <d90bdff79f8e40adf889b5408bfcf521528b169f; version=1d147bfa64293b2723c4fec50922168658e613ba <e51637e0c66a6f72d134d9f95daa47ea62b43c7e; version=1d147bfa64293b2723c4fec50922168658e613ba <e7e916d693dcb5a297f40312600a82475f2e63bc; version=3.10.34 <3.11; version=3.12.15 <3.13; version=3.13.7 <3.14; version=3.14; version=3.2.56 <3.3; version=3.4.84 <3.5; version=46a5a5493360f995b834eb3b828eb59da4604509; version=58d4310586466840dab77e56e53f4508853a5268; version=a7ee1a84a81555b19ec3d02f104bfd70cf0b668a; version=ad64b463d919a18be70b281efb135231169caf4a; version=fcb6d3c79824d350893edfa7b50d6ba1f670c4ec

Published CVSS scores

4.7Siemens ProductCERTCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7OracleCVSS: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

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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-667Improper Locking
CWE-20Improper Input Validation
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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