CVE-2021-47272

Kernel panic via dangling DWC3 gadget pointer

Published May 21, 2024 · Updated May 11, 2026

A denial-of-service flaw in the DWC3 gadget code in Linux allows local users to trigger a kernel panic through USB role changes. After a failed FunctionFS gadget rebind, dwc3_gadget_exit() dereferences a dangling dwc->gadget pointer and frees unmapped DMA memory. The trigger requires a DWC3 dual-role controller, a ConfigFS FunctionFS gadget, a stopped FunctionFS application, and repeated peripheral-to-host mode switching.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A denial-of-service flaw in the DWC3 gadget code in Linux allows local users to trigger a kernel panic through USB role changes. After a failed FunctionFS gadget rebind, dwc3_gadget_exit() dereferences a dangling dwc->gadget pointer and frees unmapped DMA memory. The trigger requires a DWC3 dual-role controller, a ConfigFS FunctionFS gadget, a stopped FunctionFS application, and repeated peripheral-to-host mode switching.

The record

CVE
CVE-2021-47272
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=5.10
  2. Affected versionversion=e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0 <03715ea2e3dbbc56947137ce3b4ac18a726b2f87
  3. Affected versionversion=e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0 <4aad390363d2b9b3e92428dd34d27bb7ea8f1ee8
  4. Affected versionversion=e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0 <851dee5a5da56564a70290713aee665403bb0b24

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0 <03715ea2e3dbbc56947137ce3b4ac18a726b2f87; version=e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0 <4aad390363d2b9b3e92428dd34d27bb7ea8f1ee8; version=e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0 <851dee5a5da56564a70290713aee665403bb0b24

Published CVSS scores

5.5NIST NVDCVSS: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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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

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Your stack

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