{"id":"CVE-2026-72409","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-72409","generatedAt":"2026-10-28T03:29:12.098Z","title":"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)…","description":"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 (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.","published":"2026-08-15T06:22:14.000Z","lastModified":"2026-10-16T19:17:29.000Z","status":"Received","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":[],"affected":[],"epss":{"score":0.00716,"percentile":0.53514,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.72%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5bdb33ff6e58bdc43632e98b30723eb65352d671","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/82c13027ed283b856017adee970dbfdffce5c6b8","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8c7a489aa71d2693752b2e794a68bf672d16c829","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b84dd48f9da1eb132bdc06a944423cd5a1641ef1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/be626ac1faadd49c2cead9f9cd06ba8752d81563","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bf88cd3b649bc3e638f1e8a77649581852747a68","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fd398d6480987e4c84fff0aaab6b9d6642a93343","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72409","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}