Linux kernel gpio:pca953x regmap sync unlock concurrency flaw
CVE-2026-74733 Published on August 22, 2026
gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock
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.
Products Associated with CVE-2026-74733
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Affected Versions
Linux:- Version bfc6444b57dc7186b6acc964705d7516cbaf3904 and below e6a2f5f845f50b0c4299bace5111f56d3390a090 is affected.
- Version bfc6444b57dc7186b6acc964705d7516cbaf3904 and below 9dc325327babe7f159e84cbe9380a45342da0585 is affected.
- Version 58a5c93bd1a6e949267400080f07e57ffe05ec34 is affected.
- Version e2ecdddca80dd845df42376e4b0197fe97018ba2 is affected.
- Version de7cffa53149c7b48bd1bb29b02390c9f05b7f41 is affected.
- Version 6.1.101 and below 6.2 is affected.
- Version 6.6.42 and below 6.7 is affected.
- Version 6.9.11 and below 6.10 is affected.
- Version 6.10 is affected.
- Before 6.10 is unaffected.
- Version 7.1.9, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.