{"cve":"CVE-2022-48818","nvd":{"published":"2024-07-16T12:15:05.813","modified":"2026-06-17T05:16:16.517","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mv88e6xxx: don't use devres for mdiobus\n\nAs explained in commits:\n74b6d7d13307 (\"net: dsa: realtek: register the MDIO bus under devres\")\n5135e96a3dd2 (\"net: dsa: don't allocate the slave_mii_bus using devres\")\n\nmdiobus_free() will panic when called from devm_mdiobus_free() <-\ndevres_release_all() <- __device_release_driver(), and that mdiobus was\nnot previously unregistered.\n\nThe mv88e6xxx is an MDIO device, so the initial set of constraints that\nI thought would cause this (I2C or SPI buses which call ->remove on\n->shutdown) do not apply. But there is one more which applies here.\n\nIf the DSA master itself is on a bus that calls ->remove from ->shutdown\n(like dpaa2-eth, which is on the fsl-mc bus), there is a device link\nbetween the switch and the DSA master, and device_links_unbind_consumers()\nwill unbind the Marvell switch driver on shutdown.\n\nsystemd-shutdown[1]: Powering off.\nmv88e6085 0x0000000008b96000:00 sw_gl0: Link is Down\nfsl-mc dpbp.9: Removing from iommu group 7\nfsl-mc dpbp.8: Removing from iommu group 7\n------------[ cut here ]------------\nkernel BUG at drivers/net/phy/mdio_bus.c:677!\nInternal error: Oops - BUG: 0 [#1] PREEMPT SMP\nModules linked in:\nCPU: 0 PID: 1 Comm: systemd-shutdow Not tainted 5.16.5-00040-gdc05f73788e5 #15\npc : mdiobus_free+0x44/0x50\nlr : devm_mdiobus_free+0x10/0x20\nCall trace:\n mdiobus_free+0x44/0x50\n devm_mdiobus_free+0x10/0x20\n devres_release_all+0xa0/0x100\n __device_release_driver+0x190/0x220\n device_release_driver_internal+0xac/0xb0\n device_links_unbind_consumers+0xd4/0x100\n __device_release_driver+0x4c/0x220\n device_release_driver_internal+0xac/0xb0\n device_links_unbind_consumers+0xd4/0x100\n __device_release_driver+0x94/0x220\n device_release_driver+0x28/0x40\n bus_remove_device+0x118/0x124\n device_del+0x174/0x420\n fsl_mc_device_remove+0x24/0x40\n __fsl_mc_device_remove+0xc/0x20\n device_for_each_child+0x58/0xa0\n dprc_remove+0x90/0xb0\n fsl_mc_driver_remove+0x20/0x5c\n __device_release_driver+0x21c/0x220\n device_release_driver+0x28/0x40\n bus_remove_device+0x118/0x124\n device_del+0x174/0x420\n fsl_mc_bus_remove+0x80/0x100\n fsl_mc_bus_shutdown+0xc/0x1c\n platform_shutdown+0x20/0x30\n device_shutdown+0x154/0x330\n kernel_power_off+0x34/0x6c\n __do_sys_reboot+0x15c/0x250\n __arm64_sys_reboot+0x20/0x30\n invoke_syscall.constprop.0+0x4c/0xe0\n do_el0_svc+0x4c/0x150\n el0_svc+0x24/0xb0\n el0t_64_sync_handler+0xa8/0xb0\n el0t_64_sync+0x178/0x17c\n\nSo the same treatment must be applied to all DSA switch drivers, which\nis: either use devres for both the mdiobus allocation and registration,\nor don't use devres at all.\n\nThe Marvell driver already has a good structure for mdiobus removal, so\njust plug in mdiobus_free and get rid of devres.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/1b451c3994a2d322f8e55032c62c8b47b7d95900","https://git.kernel.org/stable/c/8b626d45127d6f5ada7d815b83cfdc09e8cb1394","https://git.kernel.org/stable/c/8ccebe77df6e0d88c72ba5e69cf1835927e53b6c","https://git.kernel.org/stable/c/f53a2ce893b2c7884ef94471f170839170a4eba0","https://git.kernel.org/stable/c/1b451c3994a2d322f8e55032c62c8b47b7d95900"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:52:42.518321223+00:00"},"epss":{"cve":"CVE-2022-48818","score":0.00275,"percentile":0.20007,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}