What is CVE-2021-47170?

CVE-2021-47170 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 3.3 onward and patched in 4.19.193, 5.4.124, 5.10.42 and others. CVE-2021-47170 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47170?

CVE-2021-47170 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:N/I:N/A:H.

Is there a patch available for CVE-2021-47170?

Yes, CVE-2021-47170 has been patched. Fixed versions include 4.19.193, 5.4.124, 5.10.42 and others. If you are running Linux kernel 3.3 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47170 actively exploited?

CVE-2021-47170 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47170

Medium

In the Linux kernel, the following vulnerability has been resolved: USB: usbfs: Don't WARN about excessively large memory allocations Syzbot found that the kernel generates a WARNing if the user tries to submit a bulk transfer through usbfs with a buffer that is way too large. This isn't a bug in the kernel; it's merely an invalid request from the user and the usbfs code does handle it correctly. In theory the same thing can happen with async transfers, or with the packet descriptor table for isochronous transfers. To prevent the MM subsystem from complaining about these bad allocation requests, add the __GFP_NOWARN flag to the kmalloc calls for these buffers.

Package Linux Kernel

Published 2024-03-25

Last modified 2025-03-17

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

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-770

CVE-2021-47170 is classified as CWE-770

See CWE-770 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 3.3 and later are affected. Fixed in 4.19.193, 5.4.124, 5.10.42, 5.12.9, 5.13 and their respective stable series.

Affected from

≥ 3.3

Fixed in

✓ 4.19.193 4.19.x ✓ 5.4.124 5.4.x ✓ 5.10.42 5.10.x ✓ 5.12.9 5.12.x ✓ 5.13

References

5 total

Kernel Git
https://git.kernel.org/stable/c/2ab21d6e1411999b5fb43434f421f00bf50002eb

Patch
Kernel Git
https://git.kernel.org/stable/c/2c835fede13e03f2743a333e4370b5ed2db91e83

Patch
Kernel Git
https://git.kernel.org/stable/c/4f2629ea67e7225c3fd292c7fe4f5b3c9d6392de

Patch
Kernel Git
https://git.kernel.org/stable/c/8d83f109e920d2776991fa142bb904d985dca2ed

Patch
Kernel Git
https://git.kernel.org/stable/c/9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098

Patch

Details

CVE ID CVE-2021-47170

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-03-25

Modified 2025-03-17

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47170?

CVE-2021-47170 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 3.3 onward and has been patched in 4.19.193, 5.4.124, 5.10.42 and others. CVE-2021-47170 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47170?

CVE-2021-47170 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:N/I:N/A:H.
Is there a patch available for CVE-2021-47170?

Yes. CVE-2021-47170 has been patched. Fixed versions include 4.19.193, 5.4.124, 5.10.42 and others. If you are running Linux kernel 3.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47170 actively exploited?

No. CVE-2021-47170 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.