Is CVE-2021-47001 in the CISA KEV catalog?

No. CVE-2021-47001 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-47001?

CVE-2021-47001 has a CVSS v3 base score of 4.7 (MEDIUM).

What is the EPSS score for CVE-2021-47001?

CVE-2021-47001 has an EPSS score of 0.29% (20th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-47001?

Upgrade linux on debian 11 to 5.10.38-1 or later. Fixes are available for 58 affected products.

CVE & CISA-KEV Catalog

CVE-2021-47001

MEDIUM

4.7

CVSS v3

NVD

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().

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.38-1CVE-2021-47001

linuxUbuntu

Fixed in:5.4.0-204.224USN-7173-1

linux-awsUbuntu

Fixed in:5.4.0-1137.147USN-7173-2

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1137.147~18.04.1USN-7173-2

linux-azureUbuntu

Fixed in:5.4.0-1142.149USN-7195-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1142.149~18.04.1USN-7195-2

linux-bluefieldUbuntu

Fixed in:5.4.0-1097.104USN-7173-2

linux-gcpUbuntu

Fixed in:5.4.0-1141.150USN-7173-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1141.150~18.04.1USN-7173-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-204.224~18.04.1USN-7173-1

linux-ibmUbuntu

Fixed in:5.4.0-1084.89USN-7173-2

linux-ibm-5.4Ubuntu

Fixed in:5.4.0-1084.89~18.04.1USN-7173-2

linux-image-5.4.0-1048-iotUbuntu

Fixed in:5.4.0-1048.51USN-7413-1

linux-image-5.4.0-1056-xilinx-zynqmpUbuntu

Fixed in:5.4.0-1056.60USN-7173-2

linux-image-5.4.0-1084-ibmUbuntu

Fixed in:5.4.0-1084.89~18.04.1USN-7173-2

Fixed in:5.4.0-1084.89USN-7173-2

linux-image-5.4.0-1097-bluefieldUbuntu

Fixed in:5.4.0-1097.104USN-7173-2

linux-image-5.4.0-1121-raspiUbuntu

Fixed in:5.4.0-1121.133~18.04.1USN-7173-3

Fixed in:5.4.0-1121.133USN-7173-1

linux-image-5.4.0-1125-kvmUbuntu

Fixed in:5.4.0-1125.133USN-7173-1

linux-image-5.4.0-1136-oracleUbuntu

Fixed in:5.4.0-1136.145~18.04.1USN-7173-2

Fixed in:5.4.0-1136.145USN-7173-2

linux-image-5.4.0-1137-awsUbuntu

Fixed in:5.4.0-1137.147~18.04.1USN-7173-2

Fixed in:5.4.0-1137.147USN-7173-2

linux-image-5.4.0-1141-gcpUbuntu

Fixed in:5.4.0-1141.150~18.04.1USN-7173-1

Fixed in:5.4.0-1141.150USN-7173-1

linux-image-5.4.0-1142-azureUbuntu

Fixed in:5.4.0-1142.149~18.04.1USN-7195-2

Fixed in:5.4.0-1142.149USN-7195-1

linux-image-5.4.0-204-genericUbuntu

Fixed in:5.4.0-204.224~18.04.1USN-7173-1

Fixed in:5.4.0-204.224USN-7173-1

linux-image-5.4.0-204-generic-lpaeUbuntu

Fixed in:5.4.0-204.224USN-7173-1

linux-image-5.4.0-204-lowlatencyUbuntu

Fixed in:5.4.0-204.224~18.04.1USN-7173-1

Fixed in:5.4.0-204.224USN-7173-1

linux-image-awsUbuntu

Fixed in:5.4.0.1137.147~18.04.1USN-7173-2

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1137.134USN-7173-2

linux-image-azureUbuntu

Fixed in:5.4.0.1142.149~18.04.1USN-7195-2

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1142.136USN-7195-1

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1097.93USN-7173-2

linux-image-gcpUbuntu

Fixed in:5.4.0.1141.150~18.04.1USN-7173-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1141.143USN-7173-1

linux-image-genericUbuntu

Fixed in:5.4.0.204.200USN-7173-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.204.224~18.04.1USN-7173-1

linux-image-generic-lpaeUbuntu

Fixed in:5.4.0.204.200USN-7173-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1084.89~18.04.1USN-7173-2

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1084.113USN-7173-2

linux-image-kvmUbuntu

Fixed in:5.4.0.1125.121USN-7173-1

linux-image-lowlatencyUbuntu

Fixed in:5.4.0.204.200USN-7173-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.204.224~18.04.1USN-7173-1

linux-image-oemUbuntu

Fixed in:5.4.0.204.224~18.04.1USN-7173-1

Fixed in:5.4.0.204.200USN-7173-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.204.224~18.04.1USN-7173-1

Fixed in:5.4.0.204.200USN-7173-1

linux-image-oracleUbuntu

Fixed in:5.4.0.1136.145~18.04.1USN-7173-2

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1136.129USN-7173-2

linux-image-raspiUbuntu

Fixed in:5.4.0.1121.151USN-7173-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1121.133~18.04.1USN-7173-3

linux-image-raspi2Ubuntu

Fixed in:5.4.0.1121.151USN-7173-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.204.224~18.04.1USN-7173-1

linux-image-virtualUbuntu

Fixed in:5.4.0.204.200USN-7173-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.204.224~18.04.1USN-7173-1

linux-image-xilinx-zynqmpUbuntu

Fixed in:5.4.0.1056.56USN-7173-2

linux-iotUbuntu

Fixed in:5.4.0-1048.51USN-7413-1

linux-kvmUbuntu

Fixed in:5.4.0-1125.133USN-7173-1

linux-oracleUbuntu

Fixed in:5.4.0-1136.145USN-7173-2

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1136.145~18.04.1USN-7173-2

linux-raspiUbuntu

Fixed in:5.4.0-1121.133USN-7173-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1121.133~18.04.1USN-7173-3

linux-xilinx-zynqmpUbuntu

Fixed in:5.4.0-1056.60USN-7173-2

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.29%probability of exploitation in 30 days

20thpercentile

Low risk: more likely to be exploited than 20% of all known CVEs.

References

Patch4

Other references1

security.netapp.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-04-11.