CVE-2024-36896 USB: core: Fix access violation during port device removal

2024-05-3015:29:00

Linux

github.com

linux kernel

usb

vulnerability

access violation

port device removal

kasan

syzkaller

bug

hub

intfdev

AI Score

6.9

Confidence

Low

EPSS

Percentile

15.5%

SSVC

Exploitation

none

Automatable

yes

Technical Impact

partial

JSON

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

USB: core: Fix access violation during port device removal

Testing with KASAN and syzkaller revealed a bug in port.c:disable_store():
usb_hub_to_struct_hub() can return NULL if the hub that the port belongs to
is concurrently removed, but the function does not check for this
possibility before dereferencing the returned value.

It turns out that the first dereference is unnecessary, since hub->intfdev
is the parent of the port device, so it can be changed easily. Adding a
check for hub == NULL prevents further problems.

The same bug exists in the disable_show() routine, and it can be fixed the
same way.

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
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      {
        "status": "affected",
        "version": "f061f43d7418",
        "lessThan": "5f1d68ef5dda",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
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    ],
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        "version": "f061f43d7418",
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        "versionType": "custom"
      }
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    "defaultStatus": "unknown"
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    "defaultStatus": "unknown"
  },
  {
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    ],
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    "defaultStatus": "unknown"
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      }
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    "defaultStatus": "unknown"
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  {
    "cpes": [
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    "vendor": "linux",
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    "versions": [
      {
        "status": "unaffected",
        "version": "6.8.10",
        "lessThan": "6.9",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "unaffected",
        "version": "6.9"
      }
    ],
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  },
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:6.0:-:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
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        "version": "6.0"
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  },
  {
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      {
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        "version": "6.1.91",
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      }
    ],
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  }
]