CVE-2026-99189 gpio: mxc: fix race between chained IRQ handler install and probe completion
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99189?
CVE-2026-99189 is a vulnerability in Linux, published on 28 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
gpio: mxc: fix race between chained IRQ handler install and probe completion
mxc_update_irq_chained_handler() is called before the IRQ domain, the generic IRQ chip, and the port list entry are set up. If an interrupt arrives in that window:
- mx3_gpio_irq_handler() calls generic_handle_domain_irq() with port->domain still NULL. - mx2_gpio_irq_handler() walks mxc_gpio_ports, but the port has not been added to the list yet.
Additionally, if any of the subsequent probe steps (gpio_generic_chip_init(), devm_gpiochip_add_data(), irq_domain_create_legacy(), or mxc_gpio_init_gc()) fail, the error paths never unregister the chained handler, leaving a dangling handler that points at freed memory.
Move the handler installation after all its dependencies are ready and after list_add_tail(), so the handler is never live while the data structures it touches are incomplete, and is never installed if probe fails.
Which versions are affected by CVE-2026-99189?
How do I fix CVE-2026-99189?
Upgrade to a fixed version.
Is CVE-2026-99189 being exploited?
There is no known exploitation of CVE-2026-99189 in the wild and no public exploit code.
Sources
Also known as AZL-111353, BELL-CVE-2026-99189, DEBIAN-CVE-2026-99189, GHSA-ghxr-2qfh-mxwc, UBUNTU-CVE-2026-99189.