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CVE-2026-74733

HIGHCVSS 7.8/10EPSS 0.18%

Last modified

CVE-2026-74733 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.18%

7.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 58a5c93bd1a6e949267400080f07e57ffe05ec34, < 58ed56c093a857c19f04cf3db1f02d2e793aec88; >= e2ecdddca80dd845df42376e4b0197fe97018ba2, < 5d05c4252c09ce10624be2197853c80bf87424e4; >= bfc6444b57dc7186b6acc964705d7516cbaf3904, < 41255e64eb9dd87b0b8675f4e47a9c67bcef6e39; >= bfc6444b57dc7186b6acc964705d7516cbaf3904, < bf3f37c2d40b51deb79aea910f28999d7c8c6b5a; >= bfc6444b57dc7186b6acc964705d7516cbaf3904, < e6a2f5f845f50b0c4299bace5111f56d3390a090; >= bfc6444b57dc7186b6acc964705d7516cbaf3904, < 9dc325327babe7f159e84cbe9380a45342da0585; de7cffa53149c7b48bd1bb29b02390c9f05b7f41; >= 6.1.101, < 6.1.191; >= 6.6.42, < 6.6.160; >= 6.9.11, < 6.10
LinuxLinux6.10

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74733?
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.
How severe is CVE-2026-74733?
CVE-2026-74733 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74733?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST