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CVE-2021-47198

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix use-after-free in lpfc_unreg_rpi() routine An error is detected with the following report when unloading the dr…

Published Apr 10, 2024CWE-416EPSS 0.22%

Overview

CVE-2021-47198 is a high-severity vulnerability. It was published on April 10, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

scsi: lpfc: Fix use-after-free in lpfc_unreg_rpi() routine

An error is detected with the following report when unloading the driver:

"KASAN: use-after-free in lpfc_unreg_rpi+0x1b1b"

The NLP_REG_LOGIN_SEND nlp_flag is set in lpfc_reg_fab_ctrl_node(), but the

flag is not cleared upon completion of the login.

This allows a second call to lpfc_unreg_rpi() to proceed with nlp_rpi set

to LPFC_RPI_ALLOW_ERROR. This results in a use after free access when used

as an rpi_ids array index.

Fix by clearing the NLP_REG_LOGIN_SEND nlp_flag in

lpfc_mbx_cmpl_fc_reg_login().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/79b20beccea3a3938a8500acef4e6b9d7c66142fRefgit.kernel.org/stable/c/dbebf865b3239595c1d4dba063b122862583b52aRefgit.kernel.org/stable/c/79b20beccea3a3938a8500acef4e6b9d7c66142fRefgit.kernel.org/stable/c/dbebf865b3239595c1d4dba063b122862583b52a

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47198?

CVE-2021-47198 is a high-severity vulnerability. It was published on April 10, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47198?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47198?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47198?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47198 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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