CVE-2026-74733 Linux CVE debrief

Who should care

Linux system administrators, developers, and users who rely on the gpio: pca953x driver should assess their exposure and apply patches or updates as necessary. This includes operators managing Linux-based systems, platform administrators, vulnerability management teams, and security teams responsible for monitoring and protecting Linux environments.

Why it matters

A vulnerability in the Linux kernel's gpio: pca953x driver could allow an attacker to cause an incorrect register to be read or written, potentially leading to privilege escalation or denial of service.

• Privilege escalation or denial of service may occur if an attacker exploits this vulnerability.
• System administrators should verify Linux kernel versions and apply updates to prevent potential exploitation.
• Developers should review and apply patches from Linux vendors for the gpio: pca953x driver vulnerability.

Technical summary

The Linux kernel's gpio: pca953x driver has a vulnerability that could allow an attacker to cause an incorrect register to be read or written. This is due to the pca953x_irq_bus_sync_unlock function not properly holding the i2c_lock when calling regmap functions. The vulnerability affects various Linux versions, including those prior to 6.10, 6.18.57, 7.1.9, and 7.2. Affected product deployments should be reviewed for exposure, and patches or updates should be applied as necessary to prevent potential exploitation.

Defensive priority

High

Recommended defensive actions

• Review and apply patches from Linux vendors for the gpio: pca953x driver vulnerability
• Verify Linux kernel versions and apply updates as necessary
• Monitor system logs for unusual activity related to gpio: pca953x driver
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details about the vulnerability, including its existence in the Linux kernel's gpio: pca953x driver and the potential for incorrect register access. However, specific details about exploitation or victim impact are not provided.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.