Linux Kernel GPIO subsystem Vulnerability Rated 7.8 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-74733

Key Details

CVE	CVE-2026-74733
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel
Exploitation prediction (EPSS)	0.17% probability of exploitation in the next 30 days (5% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-74733
CVE	https://www.cve.org/CVERecord?id=CVE-2026-74733

Source

Reference

NVD

CVE