gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock
CVE-2026-74733 · published 22 Aug 2026
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-74733?
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Who is affected
- Linux Linux: e2ecdddca80dd845df42376e4b0197fe97018ba2 to < 5d05c4252c09ce10624be2197853c80bf87424e4, bfc6444b57dc7186b6acc964705d7516cbaf3904 to < 41255e64eb9dd87b0b8675f4e47a9c67bcef6e39, bfc6444b57dc7186b6acc964705d7516cbaf3904 to < bf3f37c2d40b51deb79aea910f28999d7c8c6b5a, bfc6444b57dc7186b6acc964705d7516cbaf3904 to < e6a2f5f845f50b0c4299bace5111f56d3390a090
- Linux Linux: 6.10
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/5d05c4252c09ce10624be2197853c80bf87424e4
- git.kernel.org/stable/c/41255e64eb9dd87b0b8675f4e47a9c67bcef6e39
- git.kernel.org/stable/c/bf3f37c2d40b51deb79aea910f28999d7c8c6b5a
- git.kernel.org/stable/c/e6a2f5f845f50b0c4299bace5111f56d3390a090
- git.kernel.org/stable/c/9dc325327babe7f159e84cbe9380a45342da0585
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON