CVE-2026-99189

Full vulnerability record from the local CVENow database.

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.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-28 11:17:39.847000

Last modified

2026-10-28 11:17:39.847000

View original CVE JSON

{
  "id": "CVE-2026-99189",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-28T11:17:39.847",
  "lastModified": "2026-10-28T11:17:39.847",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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->domain 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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/gpio/gpio-mxc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b",
              "lessThan": "261802c14e1a3281987ea8f106701e5ed9652f68",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b",
              "lessThan": "6c1e035d881579a6e4ed1ce5feabb13d23e80a82",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b",
              "lessThan": "38d44f78f041ffe60c8e2443b99434a199e7541d",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/gpio/gpio-mxc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.6",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.6",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.59",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.13",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/261802c14e1a3281987ea8f106701e5ed9652f68",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/38d44f78f041ffe60c8e2443b99434a199e7541d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6c1e035d881579a6e4ed1ce5feabb13d23e80a82",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}