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CVE-2026-72409 (GCVE-0-2026-72409)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
net: mvneta: re-enable percpu interrupt on resume
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 12bb03b436dad56692e9a103ed26156156bef5d2 , < bf88cd3b649bc3e638f1e8a77649581852747a68 (git)
Affected: 12bb03b436dad56692e9a103ed26156156bef5d2 , < 8c7a489aa71d2693752b2e794a68bf672d16c829 (git)
Affected: 12bb03b436dad56692e9a103ed26156156bef5d2 , < 82c13027ed283b856017adee970dbfdffce5c6b8 (git)
Affected: 12bb03b436dad56692e9a103ed26156156bef5d2 , < be626ac1faadd49c2cead9f9cd06ba8752d81563 (git)
Affected: 12bb03b436dad56692e9a103ed26156156bef5d2 , < 1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6 (git)
Affected: 12bb03b436dad56692e9a103ed26156156bef5d2 , < b84dd48f9da1eb132bdc06a944423cd5a1641ef1 (git)
Affected: 12bb03b436dad56692e9a103ed26156156bef5d2 , < 5bdb33ff6e58bdc43632e98b30723eb65352d671 (git)
Affected: 12bb03b436dad56692e9a103ed26156156bef5d2 , < fd398d6480987e4c84fff0aaab6b9d6642a93343 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.4
Unaffected: 0 , < 4.4 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "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."
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              "value": "AV:N - Remote traffic on internet-facing Marvell Armada 370/XP/38x routers, NAS, and gateways drives mvneta_percpu_isr/NAPI (race step 1); the highest-impact scenario pairs sustained RX/TX load with automatic suspend/resume, so the attack is initiated from the network.\nAC:L - On PREEMPT_RT (called highly likely in the fix) or when softirq is deferred to ksoftirqd, an attacker can sustain traffic to keep NAPI pending across suspend; no uncontrollable memory layout or rare one-shot victim state is required beyond routine PM cycles.\nPR:N - Sending packets to the mvneta interface requires no credentials; in the strongest scenario suspend/resume is driven by automatic system power management rather than privileged manual action, so no account or capability on the victim is needed.\nUI:N - No victim user action is required beyond normal operation; remote traffic and automatic suspend/resume (or scheduled PM) suffice without anyone mounting devices or confirming prompts.\nS:U - The bug leaves the MPIC per-CPU IRQ permanently masked on the same host kernel/driver boundary; it does not cross VM, container, or IOMMU security domains.\nC:N - This is a driver/IRQ state-management logic error with no out-of-bounds access, use-after-free, or memory disclosure; interrupts stay masked but no kernel memory is read.\nI:N - No data structures or packets are corrupted; the failure mode is a permanently masked interrupt with no write primitive or control-flow hijack potential.\nA:H - After resume the MPIC per-CPU interrupt remains permanently masked, so the NIC never delivers packets despite hardware activity, causing complete and lasting loss of network connectivity until reboot."
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    "dateReserved": "2026-08-09T03:40:39.926Z",
    "dateUpdated": "2026-08-17T05:43:49.648Z",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/marvell/mvneta.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"12bb03b436dad56692e9a103ed26156156bef5d2\",\"lessThan\":\"bf88cd3b649bc3e638f1e8a77649581852747a68\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"12bb03b436dad56692e9a103ed26156156bef5d2\",\"lessThan\":\"8c7a489aa71d2693752b2e794a68bf672d16c829\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"12bb03b436dad56692e9a103ed26156156bef5d2\",\"lessThan\":\"82c13027ed283b856017adee970dbfdffce5c6b8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"12bb03b436dad56692e9a103ed26156156bef5d2\",\"lessThan\":\"be626ac1faadd49c2cead9f9cd06ba8752d81563\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"12bb03b436dad56692e9a103ed26156156bef5d2\",\"lessThan\":\"1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"12bb03b436dad56692e9a103ed26156156bef5d2\",\"lessThan\":\"b84dd48f9da1eb132bdc06a944423cd5a1641ef1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"12bb03b436dad56692e9a103ed26156156bef5d2\",\"lessThan\":\"5bdb33ff6e58bdc43632e98b30723eb65352d671\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"12bb03b436dad56692e9a103ed26156156bef5d2\",\"lessThan\":\"fd398d6480987e4c84fff0aaab6b9d6642a93343\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/marvell/mvneta.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"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\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:40:43+00:00",
      "cve": "CVE-2026-72409",
      "id": "CVE-2026-72409",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: mvneta: re-enable percpu interrupt on resume",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72409.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.