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CVE-2026-72409

net: mvneta: re-enable percpu interrupt on resume

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

In 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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 12bb03b436dad56692e9a103ed26156156bef5d2 · fixed in bf88cd3b649bc3e638f1e8a77649581852747a68; From 12bb03b436dad56692e9a103ed26156156bef5d2 · fixed in 8c7a489aa71d2693752b2e794a68bf672d16c829; From 12bb03b436dad56692e9a103ed26156156bef5d2 · fixed in 82c13027ed283b856017adee970dbfdffce5c6b8; From 12bb03b436dad56692e9a103ed26156156bef5d2 · fixed in be626ac1faadd49c2cead9f9cd06ba8752d81563; From 12bb03b436dad56692e9a103ed26156156bef5d2 · fixed in 1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6; From 12bb03b436dad56692e9a103ed26156156bef5d2 · fixed in b84dd48f9da1eb132bdc06a944423cd5a1641ef1; From 12bb03b436dad56692e9a103ed26156156bef5d2 · fixed in 5bdb33ff6e58bdc43632e98b30723eb65352d671; From 12bb03b436dad56692e9a103ed26156156bef5d2 · fixed in fd398d6480987e4c84fff0aaab6b9d6642a93343

  • Linux Linux

    4.4

  • KernelLinux

    From 4.4.0 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org