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CVE-2025-38720

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

net: hibmcge: fix rtnl deadlock issue

Currently, the hibmcge netdev acquires the rtnl_lock in pci_error_handlers.reset_prepare() and releases it in pci_error_handlers.reset_done().

However, in the PCI framework: pci_reset_bus - __pci_reset_slot - pci_slot_save_and_disable_locked - pci_dev_save_and_disable - err_handler->reset_prepare(dev);

This will iterate through all devices under the current bus and execute err_handler->reset_prepare(), causing two devices of the hibmcge driver to sequentially request the rtnl_lock, leading to a deadlock.

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Since the driver now executes netif_device_detach() before the reset process, it will not concurrently with other netdev APIs, so there is no need to hold the rtnl_lock now.

Therefore, this patch removes the rtnl_lock during the reset process and adjusts the position of HBG_NIC_STATE_RESETTING to ensure that multiple resets are not executed concurrently.

Detalles técnicos trazas, registros y código del informe original
In pci_slot_save_and_disable_locked():
	list_for_each_entry(dev, &slot->bus->devices, bus_list) {
		if (!dev->slot || dev->slot!= slot)
			continue;
		pci_dev_save_and_disable(dev);
		if (dev->subordinate)
			pci_bus_save_and_disable_locked(dev->subordinate);
	}

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-38720",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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          "programFiles": [
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  "published": "2025-09-04T16:15:41.710",
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          "value": "CWE-667"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hibmcge: fix rtnl deadlock issue\n\nCurrently, the hibmcge netdev acquires the rtnl_lock in\npci_error_handlers.reset_prepare() and releases it in\npci_error_handlers.reset_done().\n\nHowever, in the PCI framework:\npci_reset_bus - __pci_reset_slot - pci_slot_save_and_disable_locked -\n pci_dev_save_and_disable - err_handler->reset_prepare(dev);\n\nIn pci_slot_save_and_disable_locked():\n\tlist_for_each_entry(dev, &slot->bus->devices, bus_list) {\n\t\tif (!dev->slot || dev->slot!= slot)\n\t\t\tcontinue;\n\t\tpci_dev_save_and_disable(dev);\n\t\tif (dev->subordinate)\n\t\t\tpci_bus_save_and_disable_locked(dev->subordinate);\n\t}\n\nThis will iterate through all devices under the current bus and execute\nerr_handler->reset_prepare(), causing two devices of the hibmcge driver\nto sequentially request the rtnl_lock, leading to a deadlock.\n\nSince the driver now executes netif_device_detach()\nbefore the reset process, it will not concurrently with\nother netdev APIs, so there is no need to hold the rtnl_lock now.\n\nTherefore, this patch removes the rtnl_lock during the reset process and\nadjusts the position of HBG_NIC_STATE_RESETTING to ensure\nthat multiple resets are not executed concurrently."
    }
  ],
  "lastModified": "2026-06-17T09:17:44.040",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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}