CVE-2026-72409net: mvneta: re-enable percpu interrupt on resume
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 12bb03b436dad56692e9a103ed26156156bef5d2 before bf88cd3b649bc3e638f1e8a77649581852747a68; 12bb03b436dad56692e9a103ed26156156bef5d2 builds before 8c7a489aa71d2693752b2e794a68bf672d16c829; from 12bb03b436dad56692e9a103ed26156156bef5d2 before 82c13027ed283b856017adee970dbfdffce5c6b8; from 12bb03b436dad56692e9a103ed26156156bef5d2 before be626ac1faadd49c2cead9f9cd06ba8752d81563; 12bb03b436dad56692e9a103ed26156156bef5d2 builds before 1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6; from 12bb03b436dad56692e9a103ed26156156bef5d2 before b84dd48f9da1eb132bdc06a944423cd5a1641ef1; 12bb03b436dad56692e9a103ed26156156bef5d2 builds before 5bdb33ff6e58bdc43632e98b30723eb65352d671; from 12bb03b436dad56692e9a103ed26156156bef5d2 before fd398d6480987e4c84fff0aaab6b9d6642a93343 | CNA record |
References
- https://git.kernel.org/stable/c/bf88cd3b649bc3e638f1e8a77649581852747a68
- https://git.kernel.org/stable/c/8c7a489aa71d2693752b2e794a68bf672d16c829
- https://git.kernel.org/stable/c/82c13027ed283b856017adee970dbfdffce5c6b8
- https://git.kernel.org/stable/c/be626ac1faadd49c2cead9f9cd06ba8752d81563
- https://git.kernel.org/stable/c/1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6
- https://git.kernel.org/stable/c/b84dd48f9da1eb132bdc06a944423cd5a1641ef1
- https://git.kernel.org/stable/c/5bdb33ff6e58bdc43632e98b30723eb65352d671
- https://git.kernel.org/stable/c/fd398d6480987e4c84fff0aaab6b9d6642a93343
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.