CVE-2026-64428 (GCVE-0-2026-64428)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:55
VLAI
EPSS
VEX
Title
gpio: sch: use raw_spinlock_t in the irq startup path
Summary
In 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.
Severity
5.5 (Medium)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
7a81638485c1a62a87b4c391ecc9c651a4a9dc19 , < 3b1aa05ec27eeccc889ecaa3f2d9baa9f453e50d
(git)
Affected: 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 , < 4f03a15cc73c83740fc355ee22b336492d17b4da (git) Affected: 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 , < 7a550256d68bbdfa0903ab1c4595c04a6815493a (git) Affected: 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 , < a235cec779bb39ec8f961a935b28a2ce278c6c64 (git) Affected: 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 , < 4508366ab7dd0c2917a51a9c2e23cc1b9d35157a (git) Affected: 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 , < 41cad91a09d69e8fff4e936db29b1054b4e9f9f7 (git) Affected: 7a81638485c1a62a87b4c391ecc9c651a4a9dc19 , < 286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b (git) |
guessed | |
| Linux | Linux |
Affected:
5.13
Unaffected: 0 , < 5.13 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"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-\u003elock 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() -\u003e __setup_irq() -\u003e\nirq_startup() -\u003e sch_irq_unmask() -\u003e sch_irq_mask_unmask() carrier and\nused the original spin_lock_irqsave(\u0026sch-\u003elock) 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."
}
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"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-\u003elock 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() -\u003e __setup_irq() -\u003e\nirq_startup() -\u003e sch_irq_unmask() -\u003e sch_irq_mask_unmask() carrier and\nused the original spin_lock_irqsave(\u0026sch-\u003elock) 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."
}
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"id": "CVE-2026-64428",
"lastModified": "2026-09-04T14:54:27.377",
"metrics": {
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"baseScore": 5.5,
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"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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"version": "3.1"
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"id": "CVE-2026-64428",
"initial_release_date": "2026-07-25T00:00:00+00:00",
"product_status:known_affected": "14",
"product_status:known_not_affected": "260",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: gpio: sch: use raw_spinlock_t in the irq startup path",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64428.json",
"version": "3"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.