{"id":"CVE-2026-72409","summary":"net: mvneta: re-enable percpu interrupt on resume","details":"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     =\u003e 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 =\u003e napi_disable(): cancels the pending poll\n     without executing the completion path\n  4. suspend_device_irqs =\u003e IRQCHIP_MASK_ON_SUSPEND: masks MPIC\n     (already masked, but records IRQS_SUSPENDED)\n  5. Resume: mpic_resume checks irq_percpu_is_enabled() =\u003e false\n     (bit was cleared in step 1) =\u003e 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.","modified":"2026-08-18T03:56:55.868319118Z","published":"2026-08-15T05:56:32.152Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72409.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5bdb33ff6e58bdc43632e98b30723eb65352d671"},{"type":"WEB","url":"https://git.kernel.org/stable/c/82c13027ed283b856017adee970dbfdffce5c6b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8c7a489aa71d2693752b2e794a68bf672d16c829"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b84dd48f9da1eb132bdc06a944423cd5a1641ef1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/be626ac1faadd49c2cead9f9cd06ba8752d81563"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bf88cd3b649bc3e638f1e8a77649581852747a68"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd398d6480987e4c84fff0aaab6b9d6642a93343"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72409.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72409"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"12bb03b436dad56692e9a103ed26156156bef5d2"},{"fixed":"bf88cd3b649bc3e638f1e8a77649581852747a68"},{"fixed":"8c7a489aa71d2693752b2e794a68bf672d16c829"},{"fixed":"82c13027ed283b856017adee970dbfdffce5c6b8"},{"fixed":"be626ac1faadd49c2cead9f9cd06ba8752d81563"},{"fixed":"1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6"},{"fixed":"b84dd48f9da1eb132bdc06a944423cd5a1641ef1"},{"fixed":"5bdb33ff6e58bdc43632e98b30723eb65352d671"},{"fixed":"fd398d6480987e4c84fff0aaab6b9d6642a93343"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72409.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.4.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72409.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}