ghsa-j78r-hv87-26mj
Vulnerability from github
Published
2025-05-01 15:31
Modified
2025-05-01 15:31
Details

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

net: mdio: fix undefined behavior in bit shift for __mdiobus_register

Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below:

UBSAN: shift-out-of-bounds in drivers/net/phy/mdio_bus.c:586:27 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c __mdiobus_register+0x49d/0x4e0 fixed_mdio_bus_init+0xd8/0x12d do_one_initcall+0x76/0x430 kernel_init_freeable+0x3b3/0x422 kernel_init+0x24/0x1e0 ret_from_fork+0x1f/0x30

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49907"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-01T15:16:15Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mdio: fix undefined behavior in bit shift for __mdiobus_register\n\nShifting signed 32-bit value by 31 bits is undefined, so changing\nsignificant bit to unsigned. The UBSAN warning calltrace like below:\n\nUBSAN: shift-out-of-bounds in drivers/net/phy/mdio_bus.c:586:27\nleft shift of 1 by 31 places cannot be represented in type \u0027int\u0027\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x7d/0xa5\n dump_stack+0x15/0x1b\n ubsan_epilogue+0xe/0x4e\n __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c\n __mdiobus_register+0x49d/0x4e0\n fixed_mdio_bus_init+0xd8/0x12d\n do_one_initcall+0x76/0x430\n kernel_init_freeable+0x3b3/0x422\n kernel_init+0x24/0x1e0\n ret_from_fork+0x1f/0x30\n \u003c/TASK\u003e",
  "id": "GHSA-j78r-hv87-26mj",
  "modified": "2025-05-01T15:31:52Z",
  "published": "2025-05-01T15:31:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49907"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40e4eb324c59e11fcb927aa46742d28aba6ecb8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4954b5359eb141499492fadfab891e28905509e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/634f066d02bdb22a26da7deb0c7617ab1a65fc9d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ce6f8f8f6316da6f92afe7490bc2f0b654d68e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7006176a3c863e3e353ce1b8a349ef5bb1b9320e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/985a88bf0b27193522bba7856b1763f428cef19d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3fafc974be37319679f36dc4e7cca7db1e02973"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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