gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock (CVE-2026-74733) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-74733

gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock

Answer in brief

CVE-2026-74733 records a Unknown severity vulnerability in gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 22, 2026Updated Aug 22, 2026Source checked Aug 22, 2026First seen by HOL Aug 22, 2026Material review Aug 22, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=bfc6444b57dc7186b6acc964705d7516cbaf3904 <e6a2f5f845f50b0c4299bace5111f56d3390a090 \|\| >=bfc6444b57dc7186b6acc964705d7516cbaf3904 <9dc325327babe7f159e84cbe9380a45342da0585 \|\| 58a5c93bd1a6e949267400080f07e57ffe05ec34 \|\| e2ecdddca80dd845df42376e4b0197fe97018ba2 \|\| de7cffa53149c7b48bd1bb29b02390c9f05b7f41 \|\| >=6.1.101 <6.2 \|\| >=6.6.42 <6.7 \|\| >=6.9.11 <6.10	e6a2f5f845f50b0c4299bace5111f56d3390a090, 9dc325327babe7f159e84cbe9380a45342da0585, 6.2, 6.7, 6.10
Linux/Linuxgeneric	6.10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to e6a2f5f845f50b0c4299bace5111f56d3390a090 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 22, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock Locking is disabled in the regmap config as this driver uses its own lock. This means that all calls to regmap functions (read or write) must hold the i2c_lock. The function pca953x_irq_bus_sync_unlock() did not do this, and it was therefore possible that multiple threads could cause an incorrect register to be read/written. A previous patch partly fixed this, but only protected the write to the interrupt mask register, and not the read from the direction register.

Quoted source text, attributed separately from HOL analysis.