CVE-2026-74733: gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock

lowCVSS 3CVE-2026-74733

CSIRTS triage

vendor: Linux product: Linux KernelOther

What: A locking issue in the pca953x GPIO driver where regmap lock state is not properly managed in the IRQ bus synchronization function.
Who is affected: Systems using the pca953x GPIO controller driver.
Urgency: Low priority; no active exploitation reported and CVSS score is minimal.
Action: Apply kernel patches addressing CVE-2026-74733 when available through distribution updates.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: low — CVSS 3
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74733

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-747330.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74733	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highCVE-2026-74733: In the Linux kernel, the following vulnerability has been resolved: gpio: pca953x: fix pca953x…nvd

Recent advisories for gpio

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-74733: In the Linux kernel, the following vulnerability has been resolved: gpio: pca953x: fix pca953x…nvd · 2026-08-22
unknownCVE-2026-74468: In the Linux kernel, the following vulnerability has been resolved: gpio: pch: use raw_spinloc…nvd · 2026-08-15
unknownCVE-2026-72324: In the Linux kernel, the following vulnerability has been resolved: gpio: mvebu: free generic …nvd · 2026-08-15
unknownCVE-2026-72063: In the Linux kernel, the following vulnerability has been resolved: gpio: tegra: do not call p…nvd · 2026-08-15
unknownCVE-2026-72062: In the Linux kernel, the following vulnerability has been resolved: gpio: mt7621: avoid corrup…nvd · 2026-08-15
mediumCVE-2024-42253: gpio: pca953x: fix pca953x_irq_bus_sync_unlock racemsrc · 2026-08-06