CVE-2024-35997

CPU lock-up via pending-flag interrupt loop

Published May 20, 2024 · Updated May 12, 2026

Improper locking in Linux kernel i2c-hid allows local users to lock up a CPU by racing an I2C transfer with a device interrupt. The i2c_hid_xfer function sets I2C_HID_READ_PENDING, causing i2c_hid_irq to return without service while repeated interrupts prevent the flag-clearing task from running. Reachability requires an affected kernel using the i2c-hid driver and an interrupt during the pending transfer; the bounded consequence is a CPU lock-up and service interruption.

CVSS severity5.5
Medium
EPSS probability0.18%
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 Linux kernel i2c-hid allows local users to lock up a CPU by racing an I2C transfer with a device interrupt. The i2c_hid_xfer function sets I2C_HID_READ_PENDING, causing i2c_hid_irq to return without service while repeated interrupts prevent the flag-clearing task from running. Reachability requires an affected kernel using the i2c-hid driver and an interrupt during the pending transfer; the bounded consequence is a CPU lock-up and service interruption.

The record

CVE
CVE-2024-35997
Published
May 20, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 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=3.8; version=4a200c3b9a40242652b5734630bdd0bcf3aca75f <0561b65fbd53d3e788c5b0222d9112ca016fd6a1; version=4a200c3b9a40242652b5734630bdd0bcf3aca75f <21bfca822cfc1e71796124e93b46e0d9fa584401; version=4a200c3b9a40242652b5734630bdd0bcf3aca75f <29e94f295bad5be59cf4271a93e22cdcf5536722; version=4a200c3b9a40242652b5734630bdd0bcf3aca75f <418c5575d56410c6e186ab727bf32ae32447d497; version=4a200c3b9a40242652b5734630bdd0bcf3aca75f <5095b93021b899f54c9355bebf36d78854c33a22; version=4a200c3b9a40242652b5734630bdd0bcf3aca75f <9c0f59e47a90c54d0153f8ddc0f80d7a36207d0e; version=4a200c3b9a40242652b5734630bdd0bcf3aca75f <b65fb50e04a95eec34a9d1bc138454a98a5578d8; version=4a200c3b9a40242652b5734630bdd0bcf3aca75f <c448a9fd50f77e8fb9156ff64848aa4295eb3003
The Linux Kernel Organization · Linux Kernelversion=0 <0561b65fbd53; version=3.8; version=4a200c3b9a40 <21bfca822cfc; version=4a200c3b9a40 <29e94f295bad; version=4a200c3b9a40 <418c5575d564; version=4a200c3b9a40 <5095b93021b8; version=4a200c3b9a40 <=9c0f59e47a90; version=4a200c3b9a40 <b65fb50e04a9; version=4a200c3b9a40 <c448a9fd50f7

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Siemens ProductCERTCVSS: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-667Improper Locking
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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