NTB: epf: Avoid calling pci_irq_vector() from hardirq context

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64430
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:27 UTC
Updated2026-07-27 05:16:49 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: NTB: epf: Avoid calling pci_irq_vector() from hardirq context ntb_epf_vec_isr() calls pci_irq_vector() in hardirq context to derive the vector number. pci_irq_vector() calls msi_get_virq() that takes a mutex and can therefore trigger "scheduling while atomic" splats: BUG: scheduling while atomic: kworker/u33:0/55/0x00010001 ... Call trace: ... schedule+0x38/0x110 schedule_preempt_disabled+0x28/0x50 __mutex_lock.constprop.0+0x848/0x908 __mutex_lock_slowpath+0x18/0x30 mutex_lock+0x4c/0x60 msi_domain_get_virq+0xe8/0x138 pci_irq_vector+0x2c/0x60 ntb_epf_vec_isr+0x28/0x120 [ntb_hw_epf] __handle_irq_event_percpu+0x70/0x3a8 handle_irq_event+0x48/0x100 handle_edge_irq+0x100/0x1c8 ... Cache the Linux IRQ number for vector 0 when vectors are allocated and use it as a base in the ISR. Running the ISR in a threaded IRQ handler would also avoid the problem, but that would be unnecessary here.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.004900000 probability, percentile 0.392940000 (date 2026-07-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb 33bba331a4a5fee8b6026fe72eca13cceeec1b7b git Not specified
CNA Linux Linux affected 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb aff271b12a1eb8c8b3da19223ae1a6abe1e8168b git Not specified
CNA Linux Linux affected 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb 1dba8444ac0100133d72374634f6d7451fff1ccc git Not specified
CNA Linux Linux affected 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb 174a97f21bf9c54fa37ec0f321692e862ea130a3 git Not specified
CNA Linux Linux affected 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb f71e8d9875069fa73e335f63f02ec6e52e3aaa51 git Not specified
CNA Linux Linux affected 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb 6350df503897d57c5634f71b0767d48c3b837583 git Not specified
CNA Linux Linux affected 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb 4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f git Not specified
CNA Linux Linux affected 5.12 Not specified
CNA Linux Linux unaffected 5.12 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 6.12.96 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/174a97f21bf9c54fa37ec0f321692e862ea130a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6350df503897d57c5634f71b0767d48c3b837583 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1dba8444ac0100133d72374634f6d7451fff1ccc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aff271b12a1eb8c8b3da19223ae1a6abe1e8168b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/33bba331a4a5fee8b6026fe72eca13cceeec1b7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f71e8d9875069fa73e335f63f02ec6e52e3aaa51 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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