CVE-2021-47267

Kernel crash via null SuperSpeedPlus descriptor

Published May 21, 2024 · Updated May 11, 2026

Null pointer dereference in the Linux kernel USB gadget core allows physically proximate attackers to crash affected devices. The usb_assign_descriptors function leaves the SuperSpeedPlus descriptor pointer NULL when a gadget driver supplies none, and later 10 Gbps enumeration dereferences it. Exploitation requires a gadget using the affected API at its default maximum speed and a 10 Gbps-capable device port, cable, and host port; the resulting kernel crash interrupts the device.

CVSS severity6.3
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in the Linux kernel USB gadget core allows physically proximate attackers to crash affected devices. The usb_assign_descriptors function leaves the SuperSpeedPlus descriptor pointer NULL when a gadget driver supplies none, and later 10 Gbps enumeration dereferences it. Exploitation requires a gadget using the affected API at its default maximum speed and a 10 Gbps-capable device port, cable, and host port; the resulting kernel crash interrupts the device.

The record

CVE
CVE-2021-47267
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
physical
Privileges
Unavailable

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

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Is a vulnerable build present?

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

  1. Affected versionversion=10287baec761d33f0a82d84b46e37a44030350d8 <032e288097a553db5653af552dd8035cd2a0ba96
  2. Affected versionversion=10287baec761d33f0a82d84b46e37a44030350d8 <45f9a2fe737dc0a5df270787f2231aee8985cd59
  3. Affected versionversion=10287baec761d33f0a82d84b46e37a44030350d8 <5ef23506695b01d5d56a13a092a97f2478069d75
  4. Affected versionversion=10287baec761d33f0a82d84b46e37a44030350d8 <70cd19cb5bd94bbb5bacfc9c1e4ee0071699a604
  5. Affected versionversion=10287baec761d33f0a82d84b46e37a44030350d8 <b972eff874637402ddc4a7dd11fb22538a0b6d28
  6. Affected versionversion=10287baec761d33f0a82d84b46e37a44030350d8 <ca6bc277430d90375452b60b047763a090b7673e
  7. Affected versionversion=10287baec761d33f0a82d84b46e37a44030350d8 <fd24be23abf3e94260be0f00bb42c7e91d495f87
  8. Affected versionversion=3.8

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=10287baec761d33f0a82d84b46e37a44030350d8 <032e288097a553db5653af552dd8035cd2a0ba96; version=10287baec761d33f0a82d84b46e37a44030350d8 <45f9a2fe737dc0a5df270787f2231aee8985cd59; version=10287baec761d33f0a82d84b46e37a44030350d8 <5ef23506695b01d5d56a13a092a97f2478069d75; version=10287baec761d33f0a82d84b46e37a44030350d8 <70cd19cb5bd94bbb5bacfc9c1e4ee0071699a604; version=10287baec761d33f0a82d84b46e37a44030350d8 <b972eff874637402ddc4a7dd11fb22538a0b6d28; version=10287baec761d33f0a82d84b46e37a44030350d8 <ca6bc277430d90375452b60b047763a090b7673e; version=10287baec761d33f0a82d84b46e37a44030350d8 <fd24be23abf3e94260be0f00bb42c7e91d495f87; version=3.8

Published CVSS scores

6.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorphysical
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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