GHSA-GHXR-2QFH-MXWC
Vulnerability from github – Published: 2026-10-28 12:31 – Updated: 2026-10-28 12:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-99189"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-28T11:17:39Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: mxc: fix race between chained IRQ handler install and probe completion\n\nmxc_update_irq_chained_handler() is called before the IRQ domain, the\ngeneric IRQ chip, and the port list entry are set up. If an interrupt\narrives in that window:\n\n - mx3_gpio_irq_handler() calls generic_handle_domain_irq() with\n port-\u003edomain still NULL.\n - mx2_gpio_irq_handler() walks mxc_gpio_ports, but the port has not\n been added to the list yet.\n\nAdditionally, if any of the subsequent probe steps\n(gpio_generic_chip_init(), devm_gpiochip_add_data(),\nirq_domain_create_legacy(), or mxc_gpio_init_gc()) fail, the error\npaths never unregister the chained handler, leaving a dangling handler\nthat points at freed memory.\n\nMove the handler installation after all its dependencies are ready and\nafter list_add_tail(), so the handler is never live while the data\nstructures it touches are incomplete, and is never installed if probe\nfails.",
"id": "GHSA-ghxr-2qfh-mxwc",
"modified": "2026-10-28T12:31:07Z",
"published": "2026-10-28T12:31:07Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99189"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/261802c14e1a3281987ea8f106701e5ed9652f68"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/38d44f78f041ffe60c8e2443b99434a199e7541d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6c1e035d881579a6e4ed1ce5feabb13d23e80a82"
}
],
"schema_version": "1.4.0",
"severity": []
}
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