CVE-2021-47503

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

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()

Category

6.2
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/1e434d2687e8bc0b3cdc9dd093c0e9047c0b4add patch
https://git.kernel.org/stable/c/f8dccc1bdea7e21b5ec06c957aef8831c772661c patch
https://git.kernel.org/stable/c/653926205741add87a6cf452e21950eebc6ac10b patch

Frequently Asked Questions

What is the severity of CVE-2021-47503?
CVE-2021-47503 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47503?
To fix CVE-2021-47503, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47503 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47503 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47503?
CVE-2021-47503 affects Linux Linux, Linux Linux.
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