CVE-2025-38720 (GCVE-0-2025-38720)
Vulnerability from cvelistv5
Published
2025-09-04 15:33
Modified
2025-09-04 15:33
Severity ?
Summary
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); 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); } 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. 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1343a8994ca7dba78f5dd818e89d68331c21c35d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c875503a9b9082928d7d3fc60b5400d16fbfae4e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d85a6346fd6f595c4914205762d0cdf35c004a5e
Impacted products
Vendor Product Version
Linux Linux Version: 3f5a61f6d504f55ed1a36cce044d5123d508721f
Version: 3f5a61f6d504f55ed1a36cce044d5123d508721f
Version: 3f5a61f6d504f55ed1a36cce044d5123d508721f
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   Linux Linux Version: 6.14
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/hisilicon/hibmcge/hbg_err.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.14"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.11",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003ereset_prepare(dev);\n\nIn pci_slot_save_and_disable_locked():\n\tlist_for_each_entry(dev, \u0026slot-\u003ebus-\u003edevices, bus_list) {\n\t\tif (!dev-\u003eslot || dev-\u003eslot!= slot)\n\t\t\tcontinue;\n\t\tpci_dev_save_and_disable(dev);\n\t\tif (dev-\u003esubordinate)\n\t\t\tpci_bus_save_and_disable_locked(dev-\u003esubordinate);\n\t}\n\nThis will iterate through all devices under the current bus and execute\nerr_handler-\u003ereset_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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-04T15:33:14.057Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d85a6346fd6f595c4914205762d0cdf35c004a5e"
        },
        {
          "url": "https://git.kernel.org/stable/c/1343a8994ca7dba78f5dd818e89d68331c21c35d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c875503a9b9082928d7d3fc60b5400d16fbfae4e"
        }
      ],
      "title": "net: hibmcge: fix rtnl deadlock issue",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38720",
    "datePublished": "2025-09-04T15:33:14.057Z",
    "dateReserved": "2025-04-16T04:51:24.033Z",
    "dateUpdated": "2025-09-04T15:33:14.057Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38720\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-04T16:15:41.710\",\"lastModified\":\"2025-09-05T17:47:24.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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-\u003ereset_prepare(dev);\\n\\nIn pci_slot_save_and_disable_locked():\\n\\tlist_for_each_entry(dev, \u0026slot-\u003ebus-\u003edevices, bus_list) {\\n\\t\\tif (!dev-\u003eslot || dev-\u003eslot!= slot)\\n\\t\\t\\tcontinue;\\n\\t\\tpci_dev_save_and_disable(dev);\\n\\t\\tif (dev-\u003esubordinate)\\n\\t\\t\\tpci_bus_save_and_disable_locked(dev-\u003esubordinate);\\n\\t}\\n\\nThis will iterate through all devices under the current bus and execute\\nerr_handler-\u003ereset_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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1343a8994ca7dba78f5dd818e89d68331c21c35d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c875503a9b9082928d7d3fc60b5400d16fbfae4e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d85a6346fd6f595c4914205762d0cdf35c004a5e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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