CVE-2024-42253

Device-register corruption via unlocked interrupt synchronization

Published Aug 8, 2024 · Updated Aug 5, 2026

Improper locking in the Linux kernel PCA953x GPIO driver allows local users to corrupt device register writes during a race. pca953x_irq_bus_sync_unlock() updates the interrupt latch and mask without holding i2c_lock, so a concurrent request can redirect latch data into the output register. Reaching the race requires local low-privileged access and a compatible GPIO device; observed failures occurred about once per thousand reboots on i.MX8MP.

CVSS severity7.8
High
EPSS probability0.17%
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 the Linux kernel PCA953x GPIO driver allows local users to corrupt device register writes during a race. pca953x_irq_bus_sync_unlock() updates the interrupt latch and mask without holding i2c_lock, so a concurrent request can redirect latch data into the output register. Reaching the race requires local low-privileged access and a compatible GPIO device; observed failures occurred about once per thousand reboots on i.MX8MP.

The record

CVE
CVE-2024-42253
Published
Aug 8, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 8, 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?

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  1. Affected versionversion=44896beae605b93f2232301befccb7ef42953198 <58a5c93bd1a6e949267400080f07e57ffe05ec34
  2. Affected versionversion=44896beae605b93f2232301befccb7ef42953198 <bfc6444b57dc7186b6acc964705d7516cbaf3904
  3. Affected versionversion=44896beae605b93f2232301befccb7ef42953198 <de7cffa53149c7b48bd1bb29b02390c9f05b7f41
  4. Affected versionversion=44896beae605b93f2232301befccb7ef42953198 <e2ecdddca80dd845df42376e4b0197fe97018ba2
  5. Affected versionversion=4.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=44896beae605b93f2232301befccb7ef42953198 <58a5c93bd1a6e949267400080f07e57ffe05ec34; version=44896beae605b93f2232301befccb7ef42953198 <bfc6444b57dc7186b6acc964705d7516cbaf3904; version=44896beae605b93f2232301befccb7ef42953198 <de7cffa53149c7b48bd1bb29b02390c9f05b7f41; version=44896beae605b93f2232301befccb7ef42953198 <e2ecdddca80dd845df42376e4b0197fe97018ba2; version=4.7

Published CVSS scores

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

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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