Bug 2467068 (CVE-2026-43181)

Summary: CVE-2026-43181 kernel: gpio: sysfs: fix chip removal with GPIOs exported over sysfs
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's GPIO (General Purpose Input/Output) and sysfs subsystems. When a GPIO is exported through sysfs and its parent controller is removed, the system fails to properly unexport the GPIO attribute. This oversight prevents the final reference to the GPIO descriptor from being dropped, leading to a resource leak. Repeated exploitation of this flaw could result in resource exhaustion, potentially causing a Denial of Service (DoS) condition.
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Description OSIDB Bzimport 2026-05-06 13:02:33 UTC 
In the Linux kernel, the following vulnerability has been resolved:

gpio: sysfs: fix chip removal with GPIOs exported over sysfs

Currently if we export a GPIO over sysfs and unbind the parent GPIO
controller, the exported attribute will remain under /sys/class/gpio
because once we remove the parent device, we can no longer associate the
descriptor with it in gpiod_unexport() and never drop the final
reference.

Rework the teardown code: provide an unlocked variant of
gpiod_unexport() and remove all exported GPIOs with the sysfs_lock taken
before unregistering the parent device itself. This is done to prevent
any new exports happening before we unregister the device completely.
Comment 1 Keith Grant 2026-05-06 20:18:58 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050639-CVE-2026-43181-2c8c@gregkh/T