net: mvneta: re-enable percpu interrupt on resume

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72409
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:14 UTC
Updated2026-08-17 06:19:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: mvneta: re-enable percpu interrupt on resume On Marvell MPIC platforms (Armada 370/XP/38x), mvneta uses a percpu IRQ disable/enable scheme for NAPI: the ISR (mvneta_percpu_isr) calls disable_percpu_irq() to mask the MPIC per-CPU interrupt and schedules NAPI poll, which calls enable_percpu_irq() on completion to unmask. If suspend occurs while NAPI poll is pending (between disable_percpu_irq in the ISR and enable_percpu_irq in poll completion), the interrupt is never re-enabled: 1. mvneta_percpu_isr: disable_percpu_irq() + napi_schedule() => MPIC masked, percpu_enabled cpumask bit cleared 2. NAPI poll does not complete before suspend proceeds (on PREEMPT_RT this is highly likely since softirqs run in ksoftirqd which gets frozen; on non-RT it can happen when softirq processing is deferred to ksoftirqd) 3. mvneta_stop_dev => napi_disable(): cancels the pending poll without executing the completion path 4. suspend_device_irqs => IRQCHIP_MASK_ON_SUSPEND: masks MPIC (already masked, but records IRQS_SUSPENDED) 5. Resume: mpic_resume checks irq_percpu_is_enabled() => false (bit was cleared in step 1) => skips unmask 6. mvneta_start_dev only restores device-level INTR_NEW_MASK, does not touch the MPIC per-CPU mask Result: MPIC per-CPU interrupt stays masked permanently. The NIC generates interrupts (INTR_NEW_CAUSE != 0) but the CPU never receives them, causing complete loss of network connectivity. Fix by calling on_each_cpu(mvneta_percpu_enable) in the resume path to unconditionally unmask the MPIC per-CPU interrupt regardless of pre-suspend state.

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: 0.006860000 probability, percentile 0.496300000 (date 2026-08-17)

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 12bb03b436dad56692e9a103ed26156156bef5d2 bf88cd3b649bc3e638f1e8a77649581852747a68 git Not specified
CNA Linux Linux affected 12bb03b436dad56692e9a103ed26156156bef5d2 8c7a489aa71d2693752b2e794a68bf672d16c829 git Not specified
CNA Linux Linux affected 12bb03b436dad56692e9a103ed26156156bef5d2 82c13027ed283b856017adee970dbfdffce5c6b8 git Not specified
CNA Linux Linux affected 12bb03b436dad56692e9a103ed26156156bef5d2 be626ac1faadd49c2cead9f9cd06ba8752d81563 git Not specified
CNA Linux Linux affected 12bb03b436dad56692e9a103ed26156156bef5d2 1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6 git Not specified
CNA Linux Linux affected 12bb03b436dad56692e9a103ed26156156bef5d2 b84dd48f9da1eb132bdc06a944423cd5a1641ef1 git Not specified
CNA Linux Linux affected 12bb03b436dad56692e9a103ed26156156bef5d2 5bdb33ff6e58bdc43632e98b30723eb65352d671 git Not specified
CNA Linux Linux affected 12bb03b436dad56692e9a103ed26156156bef5d2 fd398d6480987e4c84fff0aaab6b9d6642a93343 git Not specified
CNA Linux Linux affected 4.4 Not specified
CNA Linux Linux unaffected 4.4 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* 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 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5bdb33ff6e58bdc43632e98b30723eb65352d671 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/be626ac1faadd49c2cead9f9cd06ba8752d81563 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8c7a489aa71d2693752b2e794a68bf672d16c829 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82c13027ed283b856017adee970dbfdffce5c6b8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b84dd48f9da1eb132bdc06a944423cd5a1641ef1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf88cd3b649bc3e638f1e8a77649581852747a68 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fd398d6480987e4c84fff0aaab6b9d6642a93343 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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