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CVE-2021-47001

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Fix cwnd update ordering After a reconnect, the reply handler is opening the cwnd (and thus enabling more RPC Calls t…

Published Feb 28, 2024EPSS 0.75%

Overview

CVE-2021-47001 is a high-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

xprtrdma: Fix cwnd update ordering

After a reconnect, the reply handler is opening the cwnd (and thus

enabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs()

can post enough Receive WRs to receive their replies. This causes an

RNR and the new connection is lost immediately.

The race is most clearly exposed when KASAN and disconnect injection

are enabled. This slows down rpcrdma_rep_create() enough to allow

the send side to post a bunch of RPC Calls before the Receive

completion handler can invoke ib_post_recv().

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/19b5fa9489b5706bc878c3a522a7f771079e2fa0Refgit.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77cRefgit.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95Refgit.kernel.org/stable/c/eddae8be7944096419c2ae29477a45f767d0fcd4Refgit.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0Refgit.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77cRefgit.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95Refgit.kernel.org/stable/c/eddae8be7944096419c2ae29477a45f767d0fcd4Refsecurity.netapp.com/advisory/ntap-20250411-0001/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47001?

CVE-2021-47001 is a high-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-47001?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47001?

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-2021-47001?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47001 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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