CVE-2021-47170

Service interruption via oversized usbfs allocation request

Published Mar 25, 2024 · Updated May 11, 2026

Resource-allocation handling in affected Linux kernels allows local users to trigger a kernel warning through an oversized usbfs request. The usbfs bulk, asynchronous-transfer, and isochronous-descriptor paths pass user-controlled allocation sizes to kmalloc without __GFP_NOWARN, so the memory manager warns on an invalid request that usbfs otherwise handles. Reachability requires local usbfs access; service interruption is limited to systems configured to panic on kernel warnings.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Resource-allocation handling in affected Linux kernels allows local users to trigger a kernel warning through an oversized usbfs request. The usbfs bulk, asynchronous-transfer, and isochronous-descriptor paths pass user-controlled allocation sizes to kmalloc without __GFP_NOWARN, so the memory manager warns on an invalid request that usbfs otherwise handles. Reachability requires local usbfs access; service interruption is limited to systems configured to panic on kernel warnings.

The record

CVE
CVE-2021-47170
Published
Mar 25, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-770, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.3
  2. Affected versionversion=add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 <2ab21d6e1411999b5fb43434f421f00bf50002eb
  3. Affected versionversion=add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 <2c835fede13e03f2743a333e4370b5ed2db91e83
  4. Affected versionversion=add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 <4f2629ea67e7225c3fd292c7fe4f5b3c9d6392de
  5. Affected versionversion=add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 <8d83f109e920d2776991fa142bb904d985dca2ed
  6. Affected versionversion=add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 <9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.3; version=add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 <2ab21d6e1411999b5fb43434f421f00bf50002eb; version=add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 <2c835fede13e03f2743a333e4370b5ed2db91e83; version=add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 <4f2629ea67e7225c3fd292c7fe4f5b3c9d6392de; version=add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 <8d83f109e920d2776991fa142bb904d985dca2ed; version=add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 <9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098

Published CVSS scores

4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo