FKIE_CVE-2022-50545

Vulnerability from fkie_nvd - Published: 2025-10-07 16:15 - Updated: 2026-02-04 19:13
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: r6040: Fix kmemleak in probe and remove There is a memory leaks reported by kmemleak: unreferenced object 0xffff888116111000 (size 2048): comm "modprobe", pid 817, jiffies 4294759745 (age 76.502s) hex dump (first 32 bytes): 00 c4 0a 04 81 88 ff ff 08 10 11 16 81 88 ff ff ................ 08 10 11 16 81 88 ff ff 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff815bcd82>] kmalloc_trace+0x22/0x60 [<ffffffff827e20ee>] phy_device_create+0x4e/0x90 [<ffffffff827e6072>] get_phy_device+0xd2/0x220 [<ffffffff827e7844>] mdiobus_scan+0xa4/0x2e0 [<ffffffff827e8be2>] __mdiobus_register+0x482/0x8b0 [<ffffffffa01f5d24>] r6040_init_one+0x714/0xd2c [r6040] ... The problem occurs in probe process as follows: r6040_init_one: mdiobus_register mdiobus_scan <- alloc and register phy_device, the reference count of phy_device is 3 r6040_mii_probe phy_connect <- connect to the first phy_device, so the reference count of the first phy_device is 4, others are 3 register_netdev <- fault inject succeeded, goto error handling path // error handling path err_out_mdio_unregister: mdiobus_unregister(lp->mii_bus); err_out_mdio: mdiobus_free(lp->mii_bus); <- the reference count of the first phy_device is 1, it is not released and other phy_devices are released // similarly, the remove process also has the same problem The root cause is traced to the phy_device is not disconnected when removes one r6040 device in r6040_remove_one() or on error handling path after r6040_mii probed successfully. In r6040_mii_probe(), a net ethernet device is connected to the first PHY device of mii_bus, in order to notify the connected driver when the link status changes, which is the default behavior of the PHY infrastructure to handle everything. Therefore the phy_device should be disconnected when removes one r6040 device or on error handling path. Fix it by adding phy_disconnect() when removes one r6040 device or on error handling path after r6040_mii probed successfully.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2ce242e1b9ad31c1f68496b3548e407a8cb2c07dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d5f83a62e8235d235534b3dc6f197d8a822c269Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5944c25c67de54e0aa53623e1e1af3bf8b16ed44Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7e43039a49c2da45edc1d9d7c9ede4003ab45a5fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9b5b50329e2e966831a7237dd6949e7b5362a49aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a04707f4596952049da05756c27398c34d9a1d36Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad2c8f25457ca9a81e7e958148cbc26600ce3071Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0a61359026b57a287a48fbb4ba1d097023eca3ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b4448816e6a565e08236a6009c6bf48c6836cdfdPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nr6040: Fix kmemleak in probe and remove\n\nThere is a memory leaks reported by kmemleak:\n\n  unreferenced object 0xffff888116111000 (size 2048):\n    comm \"modprobe\", pid 817, jiffies 4294759745 (age 76.502s)\n    hex dump (first 32 bytes):\n      00 c4 0a 04 81 88 ff ff 08 10 11 16 81 88 ff ff  ................\n      08 10 11 16 81 88 ff ff 00 00 00 00 00 00 00 00  ................\n    backtrace:\n      [\u003cffffffff815bcd82\u003e] kmalloc_trace+0x22/0x60\n      [\u003cffffffff827e20ee\u003e] phy_device_create+0x4e/0x90\n      [\u003cffffffff827e6072\u003e] get_phy_device+0xd2/0x220\n      [\u003cffffffff827e7844\u003e] mdiobus_scan+0xa4/0x2e0\n      [\u003cffffffff827e8be2\u003e] __mdiobus_register+0x482/0x8b0\n      [\u003cffffffffa01f5d24\u003e] r6040_init_one+0x714/0xd2c [r6040]\n      ...\n\nThe problem occurs in probe process as follows:\n  r6040_init_one:\n    mdiobus_register\n      mdiobus_scan    \u003c- alloc and register phy_device,\n                         the reference count of phy_device is 3\n    r6040_mii_probe\n      phy_connect     \u003c- connect to the first phy_device,\n                         so the reference count of the first\n                         phy_device is 4, others are 3\n    register_netdev   \u003c- fault inject succeeded, goto error handling path\n\n    // error handling path\n    err_out_mdio_unregister:\n      mdiobus_unregister(lp-\u003emii_bus);\n    err_out_mdio:\n      mdiobus_free(lp-\u003emii_bus);    \u003c- the reference count of the first\n                                       phy_device is 1, it is not released\n                                       and other phy_devices are released\n  // similarly, the remove process also has the same problem\n\nThe root cause is traced to the phy_device is not disconnected when\nremoves one r6040 device in r6040_remove_one() or on error handling path\nafter r6040_mii probed successfully. In r6040_mii_probe(), a net ethernet\ndevice is connected to the first PHY device of mii_bus, in order to\nnotify the connected driver when the link status changes, which is the\ndefault behavior of the PHY infrastructure to handle everything.\nTherefore the phy_device should be disconnected when removes one r6040\ndevice or on error handling path.\n\nFix it by adding phy_disconnect() when removes one r6040 device or on\nerror handling path after r6040_mii probed successfully."
    }
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  "id": "CVE-2022-50545",
  "lastModified": "2026-02-04T19:13:18.097",
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          "attackVector": "LOCAL",
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          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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        "source": "nvd@nist.gov",
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  "published": "2025-10-07T16:15:38.943",
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}


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