FKIE_CVE-2026-72409

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-10-16 19:17
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5bdb33ff6e58bdc43632e98b30723eb65352d671
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82c13027ed283b856017adee970dbfdffce5c6b8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c7a489aa71d2693752b2e794a68bf672d16c829
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b84dd48f9da1eb132bdc06a944423cd5a1641ef1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be626ac1faadd49c2cead9f9cd06ba8752d81563
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf88cd3b649bc3e638f1e8a77649581852747a68
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fd398d6480987e4c84fff0aaab6b9d6642a93343
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/marvell/mvneta.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bf88cd3b649bc3e638f1e8a77649581852747a68",
              "status": "affected",
              "version": "12bb03b436dad56692e9a103ed26156156bef5d2",
              "versionType": "git"
            },
            {
              "lessThan": "8c7a489aa71d2693752b2e794a68bf672d16c829",
              "status": "affected",
              "version": "12bb03b436dad56692e9a103ed26156156bef5d2",
              "versionType": "git"
            },
            {
              "lessThan": "82c13027ed283b856017adee970dbfdffce5c6b8",
              "status": "affected",
              "version": "12bb03b436dad56692e9a103ed26156156bef5d2",
              "versionType": "git"
            },
            {
              "lessThan": "be626ac1faadd49c2cead9f9cd06ba8752d81563",
              "status": "affected",
              "version": "12bb03b436dad56692e9a103ed26156156bef5d2",
              "versionType": "git"
            },
            {
              "lessThan": "1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6",
              "status": "affected",
              "version": "12bb03b436dad56692e9a103ed26156156bef5d2",
              "versionType": "git"
            },
            {
              "lessThan": "b84dd48f9da1eb132bdc06a944423cd5a1641ef1",
              "status": "affected",
              "version": "12bb03b436dad56692e9a103ed26156156bef5d2",
              "versionType": "git"
            },
            {
              "lessThan": "5bdb33ff6e58bdc43632e98b30723eb65352d671",
              "status": "affected",
              "version": "12bb03b436dad56692e9a103ed26156156bef5d2",
              "versionType": "git"
            },
            {
              "lessThan": "fd398d6480987e4c84fff0aaab6b9d6642a93343",
              "status": "affected",
              "version": "12bb03b436dad56692e9a103ed26156156bef5d2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/marvell/mvneta.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.4"
            },
            {
              "lessThan": "4.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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."
    }
  ],
  "id": "CVE-2026-72409",
  "lastModified": "2026-10-16T19:17:28.580",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-72409",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T18:49:13.017025Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-15T06:22:14.493",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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