CVE-2021-47503 scsi: pm80xx: Do not call scsi_remove_host() in pm8001_alloc()

2024-05-2415:01:50

Linux

github.com

pm80xx

scsi

vulnerability

linux kernel

pm8001_alloc

scsi_remove_host

AI Score

6.7

Confidence

Low

EPSS

Percentile

15.5%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

scsi: pm80xx: Do not call scsi_remove_host() in pm8001_alloc()

Calling scsi_remove_host() before scsi_add_host() results in a crash:

BUG: kernel NULL pointer dereference, address: 0000000000000108
RIP: 0010:device_del+0x63/0x440
Call Trace:
device_unregister+0x17/0x60
scsi_remove_host+0xee/0x2a0
pm8001_pci_probe+0x6ef/0x1b90 [pm80xx]
local_pci_probe+0x3f/0x90

We cannot call scsi_remove_host() in pm8001_alloc() because scsi_add_host()
has not been called yet at that point in time.

Function call tree:

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "affected",
        "version": "05c6c029a44d",
        "lessThan": "1e434d2687e8 ",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "affected",
        "version": "05c6c029a44d",
        "lessThan": "f8dccc1bdea7 ",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "affected",
        "version": "f8dccc1bdea7 ",
        "lessThan": "653926205741 ",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.10",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "unaffected",
        "version": "5.10.85",
        "lessThan": "5.11",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "unaffected",
        "version": "5.15.8",
        "versionType": "custom",
        "lessThanOrEqual": "5.16"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "unaffected",
        "version": "5.16"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:5.10:-:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "affected",
        "version": "5.10"
      }
    ],
    "defaultStatus": "unknown"
  }
]