gpio: sch: use raw_spinlock_t in the irq startup path

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64428
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:26 UTC
Updated2026-07-25 10:17:26 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: gpio: sch: use raw_spinlock_t in the irq startup path sch_irq_unmask() enables the GPIO IRQ and then updates the controller state through sch_irq_mask_unmask(), which takes sch->lock with spin_lock_irqsave(). The callback can be reached from irq_startup() while setting up a requested IRQ. That path is not sleepable, but on PREEMPT_RT a regular spinlock_t becomes a sleeping lock. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the request_threaded_irq() -> __setup_irq() -> irq_startup() -> sch_irq_unmask() -> sch_irq_mask_unmask() carrier and used the original spin_lock_irqsave(&sch->lock) edge. Lockdep reported: BUG: sleeping function called from invalid context hardirqs last disabled at ... __setup_irq.constprop.0 ... [vuln_msv] sch_rt_spin_lock_irqsave+0x1c/0x30 [vuln_msv] sch_irq_mask_unmask.constprop.0+0x31/0x70 [vuln_msv] __setup_irq.constprop.0+0xd/0x30 [vuln_msv] Convert the SCH controller lock to raw_spinlock_t. The same lock is also used by the GPIO direction and value callbacks, but those critical sections only update MMIO-backed GPIO registers and do not contain sleepable operations. Keeping this register lock non-sleeping is therefore appropriate for the irqchip callbacks and does not change the GPIO-side locking contract.

Risk And Classification

EPSS: 0.002150000 probability, percentile 0.119930000 (date 2026-07-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 3b1aa05ec27eeccc889ecaa3f2d9baa9f453e50d git Not specified
CNA Linux Linux affected 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 4f03a15cc73c83740fc355ee22b336492d17b4da git Not specified
CNA Linux Linux affected 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 7a550256d68bbdfa0903ab1c4595c04a6815493a git Not specified
CNA Linux Linux affected 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 a235cec779bb39ec8f961a935b28a2ce278c6c64 git Not specified
CNA Linux Linux affected 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 4508366ab7dd0c2917a51a9c2e23cc1b9d35157a git Not specified
CNA Linux Linux affected 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 41cad91a09d69e8fff4e936db29b1054b4e9f9f7 git Not specified
CNA Linux Linux affected 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a235cec779bb39ec8f961a935b28a2ce278c6c64 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3b1aa05ec27eeccc889ecaa3f2d9baa9f453e50d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4508366ab7dd0c2917a51a9c2e23cc1b9d35157a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/41cad91a09d69e8fff4e936db29b1054b4e9f9f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a550256d68bbdfa0903ab1c4595c04a6815493a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4f03a15cc73c83740fc355ee22b336492d17b4da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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