CVE-2025-38720 (GCVE-0-2025-38720)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:33 – Updated: 2025-09-29 05:56
VLAI?
Title
net: hibmcge: fix rtnl deadlock issue
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3f5a61f6d504f55ed1a36cce044d5123d508721f , < d85a6346fd6f595c4914205762d0cdf35c004a5e (git)
Affected: 3f5a61f6d504f55ed1a36cce044d5123d508721f , < 1343a8994ca7dba78f5dd818e89d68331c21c35d (git)
Affected: 3f5a61f6d504f55ed1a36cce044d5123d508721f , < c875503a9b9082928d7d3fc60b5400d16fbfae4e (git)
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    Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/hisilicon/hibmcge/hbg_err.c"
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          "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."
        }
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        "dateUpdated": "2025-09-29T05:56:44.628Z",
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      "title": "net: hibmcge: fix rtnl deadlock issue",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38720",
    "datePublished": "2025-09-04T15:33:14.057Z",
    "dateReserved": "2025-04-16T04:51:24.033Z",
    "dateUpdated": "2025-09-29T05:56:44.628Z",
    "state": "PUBLISHED"
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