CVE-2026-74733

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbfc6444b57dc7186b6acc964705d7516cbaf3904 < e6a2f5f845f50b0c4299bace5111f56d3390a090affected
LinuxLinuxbfc6444b57dc7186b6acc964705d7516cbaf3904 < 9dc325327babe7f159e84cbe9380a45342da0585affected
LinuxLinux58a5c93bd1a6e949267400080f07e57ffe05ec34affected
LinuxLinuxe2ecdddca80dd845df42376e4b0197fe97018ba2affected
LinuxLinuxde7cffa53149c7b48bd1bb29b02390c9f05b7f41affected
LinuxLinux6.1.101 < 6.2affected
LinuxLinux6.6.42 < 6.7affected
LinuxLinux6.9.11 < 6.10affected
LinuxLinux6.10affected
LinuxLinux0 < 6.10unaffected
LinuxLinux7.1.9 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References