{"id":"CVE-2026-99189","state":"PUBLISHED","title":"gpio: mxc: fix race between chained IRQ handler install and probe completion","description":"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.","publishedAt":"2026-10-28T10:35:46.366Z","updatedAt":"2026-10-28T10:35:46.366Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b","status":"affected","lessThan":"261802c14e1a3281987ea8f106701e5ed9652f68","versionType":"git"},{"version":"5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b","status":"affected","lessThan":"6c1e035d881579a6e4ed1ce5feabb13d23e80a82","versionType":"git"},{"version":"5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b","status":"affected","lessThan":"38d44f78f041ffe60c8e2443b99434a199e7541d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpio/gpio-mxc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpio/gpio-mxc.c"]}],"references":["https://git.kernel.org/stable/c/261802c14e1a3281987ea8f106701e5ed9652f68","https://git.kernel.org/stable/c/6c1e035d881579a6e4ed1ce5feabb13d23e80a82","https://git.kernel.org/stable/c/38d44f78f041ffe60c8e2443b99434a199e7541d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99189.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99189","state":"PUBLISHED","datePublished":"2026-10-28T10:35:46.366Z","dateUpdated":"2026-10-28T10:35:46.366Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.400Z"},"containers":{"cna":{"title":"gpio: mxc: fix race between chained IRQ handler install and probe completion","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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b","status":"affected","lessThan":"261802c14e1a3281987ea8f106701e5ed9652f68","versionType":"git"},{"version":"5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b","status":"affected","lessThan":"6c1e035d881579a6e4ed1ce5feabb13d23e80a82","versionType":"git"},{"version":"5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b","status":"affected","lessThan":"38d44f78f041ffe60c8e2443b99434a199e7541d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpio/gpio-mxc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpio/gpio-mxc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/261802c14e1a3281987ea8f106701e5ed9652f68"},{"url":"https://git.kernel.org/stable/c/6c1e035d881579a6e4ed1ce5feabb13d23e80a82"},{"url":"https://git.kernel.org/stable/c/38d44f78f041ffe60c8e2443b99434a199e7541d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-28T10:35:46.366Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}