CVE-2021-47503

MediumCVSS 6.2/10Last modified Jun 17, 2026

Description

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:

pm8001_pci_probe() | `- pm8001_pci_alloc() | | | `- pm8001_alloc() | | | `- scsi_remove_host() | `- scsi_add_host()

Metrics

CVSS 3.1 6.2/10CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

VendorProductVersions
LinuxLinux>= 05c6c029a44d9f43715577e33e95eba87f44d285, < 1e434d2687e8bc0b3cdc9dd093c0e9047c0b4add; >= 05c6c029a44d9f43715577e33e95eba87f44d285, < f8dccc1bdea7e21b5ec06c957aef8831c772661c; >= 05c6c029a44d9f43715577e33e95eba87f44d285, < 653926205741add87a6cf452e21950eebc6ac10b
LinuxLinux5.10
linuxlinux_kernel>= 05c6c029a44d, < 1e434d2687e8
linuxlinux_kernel>= 05c6c029a44d, < f8dccc1bdea7
linuxlinux_kernel>= f8dccc1bdea7, < 653926205741
linuxlinux_kernel—
linuxlinux_kernel—
linuxlinux_kernel—
linuxlinux_kernel—
linuxlinux_kernel5.10

References

Timeline

Published
May 24, 2024
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2021-47503: Medium severity, CVSS 6.2 | Vulnix