What is CVE-2021-47001?

CVE-2021-47001 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10, affecting Linux kernel versions from 5.4.13 onward and patched in 5.10.38, 5.11.22, 5.12.5 and others. CVE-2021-47001 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

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

CVE-2021-47001 has a CVSS score of 4.7 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-47001?

Yes, CVE-2021-47001 has been patched. Fixed versions include 5.10.38, 5.11.22, 5.12.5 and others. If you are running Linux kernel 5.4.13 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47001 actively exploited?

CVE-2021-47001 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47001

Medium

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().

Package Linux Kernel

Published 2024-02-28

Last modified 2025-04-11

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

4.7

out of 10

Medium

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 5.4.13, 5.5 and later are affected. Fixed in 5.10.38, 5.11.22, 5.12.5, 5.13 and their respective stable series.

Affected from

≥ 5.4.13 ≥ 5.5

Fixed in

✓ 5.10.38 5.10.x ✓ 5.11.22 5.11.x ✓ 5.12.5 5.12.x ✓ 5.13

References

5 total

Kernel Git
https://git.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0

Patch
Kernel Git
https://git.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77c

Patch
Kernel Git
https://git.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95

Patch
Kernel Git
https://git.kernel.org/stable/c/eddae8be7944096419c2ae29477a45f767d0fcd4

Patch
Security
https://security.netapp.com/advisory/ntap-20250411-0001/

Details

CVE ID CVE-2021-47001

Severity Medium

CVSS score 4.7 / 10

CVSS version 3.1

Published 2024-02-28

Modified 2025-04-11

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47001?

CVE-2021-47001 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10 . It affects Linux kernel versions from 5.4.13 onward and has been patched in 5.10.38, 5.11.22, 5.12.5 and others. CVE-2021-47001 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47001?

CVE-2021-47001 has a CVSS score of 4.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-47001?

Yes. CVE-2021-47001 has been patched. Fixed versions include 5.10.38, 5.11.22, 5.12.5 and others. If you are running Linux kernel 5.4.13 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47001 actively exploited?

No. CVE-2021-47001 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.