CVE-2021-29265Public exploit

Kernel crash via unsynchronized USB/IP stub-up

Published Mar 26, 2021 · Updated Aug 3, 2024

Race condition in Linux kernel USB/IP before 5.11.7 allows local users to crash the system during USB device export operations. In usbip_sockfd_store, the stub-up sequence starts receive and transmit threads before synchronizing device status, socket, file-descriptor, and thread-pointer state, and it retains an invalid thread pointer when thread creation fails. Reaching the flaw requires local access to issue USB/IP attach or detach requests; successful exploitation causes a kernel crash without reported data disclosure or modification.

CVSS severity4.7
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux kernel USB/IP before 5.11.7 allows local users to crash the system during USB device export operations. In usbip_sockfd_store, the stub-up sequence starts receive and transmit threads before synchronizing device status, socket, file-descriptor, and thread-pointer state, and it retains an invalid thread pointer when thread creation fails. Reaching the flaw requires local access to issue USB/IP attach or detach requests; successful exploitation causes a kernel crash without reported data disclosure or modification.

The record

CVE
CVE-2021-29265
Published
Mar 26, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.7NIST NVDAV:L/AC:M/Au:N/C:N/I:N/A:C
4.7NIST NVDCVSS:3.1/AV:L/AC:H/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 exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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