What is CVE-2021-47070?

CVE-2021-47070 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Memory Leak flaw (CWE-401), affecting Linux kernel versions from 4.20 onward and patched in 5.10.241, 5.12.7 and 5.13. CVE-2021-47070 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47070?

CVE-2021-47070 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Is there a patch available for CVE-2021-47070?

Yes, CVE-2021-47070 has been patched. Fixed versions include 5.10.241, 5.12.7 and 5.13. If you are running Linux kernel 4.20 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47070 actively exploited?

CVE-2021-47070 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2021-47070

Medium

In the Linux kernel, the following vulnerability has been resolved: uio_hv_generic: Fix another memory leak in error handling paths Memory allocated by 'vmbus_alloc_ring()' at the beginning of the probe function is never freed in the error handling path. Add the missing 'vmbus_free_ring()' call. Note that it is already freed in the .remove function.

Package Linux Kernel

Published 2024-03-01

Last modified 2025-11-03

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Vector string

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

Weakness type

CWE-401

CVE-2021-47070 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.20 and later are affected. Fixed in 5.10.241, 5.12.7, 5.13 and their respective stable series.

Affected from

≥ 4.20

Fixed in

✓ 5.10.241 5.10.x ✓ 5.12.7 5.12.x ✓ 5.13

References

4 total

Kernel Git
https://git.kernel.org/stable/c/0b0226be3a52dadd965644bc52a807961c2c26df

Patch
Kernel Git
https://git.kernel.org/stable/c/5f59240cf25b2f7a0fdffc2701482a70310fec07

Patch
Kernel Git
https://git.kernel.org/stable/c/261bbd90cc53d2835343f056770156cf1e82cf03
Debian Security
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

Details

CVE ID CVE-2021-47070

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-03-01

Modified 2025-11-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47070?

CVE-2021-47070 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a Memory Leak flaw (CWE-401) . It affects Linux kernel versions from 4.20 onward and has been patched in 5.10.241, 5.12.7 and 5.13. CVE-2021-47070 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47070?

CVE-2021-47070 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Is there a patch available for CVE-2021-47070?

Yes. CVE-2021-47070 has been patched. Fixed versions include 5.10.241, 5.12.7 and 5.13. If you are running Linux kernel 4.20 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47070 actively exploited?

No. CVE-2021-47070 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.