{"id":"CVE-2026-72409","title":"net: mvneta: re-enable percpu interrupt on resume","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mvneta: re-enable percpu interrupt on resume\n\nOn Marvell MPIC platforms (Armada 370/XP/38x), mvneta uses a percpu\nIRQ disable/enable scheme for NAPI: the ISR (mvne…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < bf88cd3b649bc3e638f1e8a77649581852747a68","Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < 8c7a489aa71d2693752b2e794a68bf672d16c829","Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < 82c13027ed283b856017adee970dbfdffce5c6b8","Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < be626ac1faadd49c2cead9f9cd06ba8752d81563","Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < 1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6","Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < b84dd48f9da1eb132bdc06a944423cd5a1641ef1","Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < 5bdb33ff6e58bdc43632e98b30723eb65352d671","Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < fd398d6480987e4c84fff0aaab6b9d6642a93343","Linux 4.4"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T18:49:13.017025Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:55:22.213Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72409","references":[{"url":"https://git.kernel.org/stable/c/bf88cd3b649bc3e638f1e8a77649581852747a68"},{"url":"https://git.kernel.org/stable/c/8c7a489aa71d2693752b2e794a68bf672d16c829"},{"url":"https://git.kernel.org/stable/c/82c13027ed283b856017adee970dbfdffce5c6b8"},{"url":"https://git.kernel.org/stable/c/be626ac1faadd49c2cead9f9cd06ba8752d81563"},{"url":"https://git.kernel.org/stable/c/1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6"},{"url":"https://git.kernel.org/stable/c/b84dd48f9da1eb132bdc06a944423cd5a1641ef1"},{"url":"https://git.kernel.org/stable/c/5bdb33ff6e58bdc43632e98b30723eb65352d671"},{"url":"https://git.kernel.org/stable/c/fd398d6480987e4c84fff0aaab6b9d6642a93343"}],"tags":["cve.org"],"epss":0.00716,"epssPercentile":0.52839,"ingestedAt":"2026-10-16T19:46:24.399Z","slug":"CVE-2026-72409","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: mvneta: re-enable percpu interrupt on resume\n\nOn Marvell MPIC platforms (Armada 370/XP/38x), mvneta uses a percpu\nIRQ disable/enable scheme for NAPI: the ISR (mvneta_percpu_isr) calls\ndisable_percpu_irq() to mask the MPIC per-CPU interrupt and schedules\nNAPI poll, which calls enable_percpu_irq() on completion to unmask.\n\nIf suspend occurs while NAPI poll is pending (between\ndisable_percpu_irq in the ISR and enable_percpu_irq in poll\ncompletion), the interrupt is never re-enabled:\n\n  1. mvneta_percpu_isr: disable_percpu_irq() + napi_schedule()\n     => MPIC masked, percpu_enabled cpumask bit cleared\n  2. NAPI poll does not complete before suspend proceeds\n     (on PREEMPT_RT this is highly likely since softirqs run in\n     ksoftirqd which gets frozen; on non-RT it can happen when\n     softirq processing is deferred to ksoftirqd)\n  3. mvneta_stop_dev => napi_disable(): cancels the pending poll\n     without executing the completion path\n  4. suspend_device_irqs => IRQCHIP_MASK_ON_SUSPEND: masks MPIC\n     (already masked, but records IRQS_SUSPENDED)\n  5. Resume: mpic_resume checks irq_percpu_is_enabled() => false\n     (bit was cleared in step 1) => skips unmask\n  6. mvneta_start_dev only restores device-level INTR_NEW_MASK,\n     does not touch the MPIC per-CPU mask\n\nResult: MPIC per-CPU interrupt stays masked permanently. The NIC\ngenerates interrupts (INTR_NEW_CAUSE != 0) but the CPU never\nreceives them, causing complete loss of network connectivity.\n\nFix by calling on_each_cpu(mvneta_percpu_enable) in the resume path\nto unconditionally unmask the MPIC per-CPU interrupt regardless of\npre-suspend state.\n\n## Affected\n\n- `Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < bf88cd3b649bc3e638f1e8a77649581852747a68`\n- `Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < 8c7a489aa71d2693752b2e794a68bf672d16c829`\n- `Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < 82c13027ed283b856017adee970dbfdffce5c6b8`\n- `Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < be626ac1faadd49c2cead9f9cd06ba8752d81563`\n- `Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < 1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6`\n- `Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < b84dd48f9da1eb132bdc06a944423cd5a1641ef1`\n- `Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < 5bdb33ff6e58bdc43632e98b30723eb65352d671`\n- `Linux >= 12bb03b436dad56692e9a103ed26156156bef5d2 < fd398d6480987e4c84fff0aaab6b9d6642a93343`\n- `Linux 4.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}