{"id":"CVE-2026-64428","state":"PUBLISHED","title":"gpio: sch: use raw_spinlock_t in the irq startup path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: sch: use raw_spinlock_t in the irq startup path\n\nsch_irq_unmask() enables the GPIO IRQ and then updates the controller\nstate through sch_irq_mask_unmask(), which takes sch->lock with\nspin_lock_irqsave().  The callback can be reached from irq_startup()\nwhile setting up a requested IRQ.  That path is not sleepable, but on\nPREEMPT_RT a regular spinlock_t becomes a sleeping lock.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the request_threaded_irq() -> __setup_irq() ->\nirq_startup() -> sch_irq_unmask() -> sch_irq_mask_unmask() carrier and\nused the original spin_lock_irqsave(&sch->lock) edge.  Lockdep reported:\n\n  BUG: sleeping function called from invalid context\n  hardirqs last disabled at ... __setup_irq.constprop.0 ... [vuln_msv]\n  sch_rt_spin_lock_irqsave+0x1c/0x30 [vuln_msv]\n  sch_irq_mask_unmask.constprop.0+0x31/0x70 [vuln_msv]\n  __setup_irq.constprop.0+0xd/0x30 [vuln_msv]\n\nConvert the SCH controller lock to raw_spinlock_t.  The same lock is\nalso used by the GPIO direction and value callbacks, but those critical\nsections only update MMIO-backed GPIO registers and do not contain\nsleepable operations.  Keeping this register lock non-sleeping is\ntherefore appropriate for the irqchip callbacks and does not change the\nGPIO-side locking contract.","publishedAt":"2026-07-25T08:51:05.460Z","updatedAt":"2026-08-17T04:55:28.748Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"3b1aa05ec27eeccc889ecaa3f2d9baa9f453e50d","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"4f03a15cc73c83740fc355ee22b336492d17b4da","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"7a550256d68bbdfa0903ab1c4595c04a6815493a","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"a235cec779bb39ec8f961a935b28a2ce278c6c64","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"4508366ab7dd0c2917a51a9c2e23cc1b9d35157a","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"41cad91a09d69e8fff4e936db29b1054b4e9f9f7","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpio/gpio-sch.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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-sch.c"]}],"references":["https://git.kernel.org/stable/c/3b1aa05ec27eeccc889ecaa3f2d9baa9f453e50d","https://git.kernel.org/stable/c/4f03a15cc73c83740fc355ee22b336492d17b4da","https://git.kernel.org/stable/c/7a550256d68bbdfa0903ab1c4595c04a6815493a","https://git.kernel.org/stable/c/a235cec779bb39ec8f961a935b28a2ce278c6c64","https://git.kernel.org/stable/c/4508366ab7dd0c2917a51a9c2e23cc1b9d35157a","https://git.kernel.org/stable/c/41cad91a09d69e8fff4e936db29b1054b4e9f9f7","https://git.kernel.org/stable/c/286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64428.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64428","state":"PUBLISHED","datePublished":"2026-07-25T08:51:05.460Z","dateUpdated":"2026-08-17T04:55:28.748Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.787Z"},"containers":{"cna":{"title":"gpio: sch: use raw_spinlock_t in the irq startup path","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: sch: use raw_spinlock_t in the irq startup path\n\nsch_irq_unmask() enables the GPIO IRQ and then updates the controller\nstate through sch_irq_mask_unmask(), which takes sch->lock with\nspin_lock_irqsave().  The callback can be reached from irq_startup()\nwhile setting up a requested IRQ.  That path is not sleepable, but on\nPREEMPT_RT a regular spinlock_t becomes a sleeping lock.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the request_threaded_irq() -> __setup_irq() ->\nirq_startup() -> sch_irq_unmask() -> sch_irq_mask_unmask() carrier and\nused the original spin_lock_irqsave(&sch->lock) edge.  Lockdep reported:\n\n  BUG: sleeping function called from invalid context\n  hardirqs last disabled at ... __setup_irq.constprop.0 ... [vuln_msv]\n  sch_rt_spin_lock_irqsave+0x1c/0x30 [vuln_msv]\n  sch_irq_mask_unmask.constprop.0+0x31/0x70 [vuln_msv]\n  __setup_irq.constprop.0+0xd/0x30 [vuln_msv]\n\nConvert the SCH controller lock to raw_spinlock_t.  The same lock is\nalso used by the GPIO direction and value callbacks, but those critical\nsections only update MMIO-backed GPIO registers and do not contain\nsleepable operations.  Keeping this register lock non-sleeping is\ntherefore appropriate for the irqchip callbacks and does not change the\nGPIO-side locking contract."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"3b1aa05ec27eeccc889ecaa3f2d9baa9f453e50d","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"4f03a15cc73c83740fc355ee22b336492d17b4da","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"7a550256d68bbdfa0903ab1c4595c04a6815493a","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"a235cec779bb39ec8f961a935b28a2ce278c6c64","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"4508366ab7dd0c2917a51a9c2e23cc1b9d35157a","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"41cad91a09d69e8fff4e936db29b1054b4e9f9f7","versionType":"git"},{"version":"7a81638485c1a62a87b4c391ecc9c651a4a9dc19","status":"affected","lessThan":"286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpio/gpio-sch.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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-sch.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/3b1aa05ec27eeccc889ecaa3f2d9baa9f453e50d"},{"url":"https://git.kernel.org/stable/c/4f03a15cc73c83740fc355ee22b336492d17b4da"},{"url":"https://git.kernel.org/stable/c/7a550256d68bbdfa0903ab1c4595c04a6815493a"},{"url":"https://git.kernel.org/stable/c/a235cec779bb39ec8f961a935b28a2ce278c6c64"},{"url":"https://git.kernel.org/stable/c/4508366ab7dd0c2917a51a9c2e23cc1b9d35157a"},{"url":"https://git.kernel.org/stable/c/41cad91a09d69e8fff4e936db29b1054b4e9f9f7"},{"url":"https://git.kernel.org/stable/c/286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:55:28.748Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}