CVE-2026-31728

System hard lockup via USB gadget race

Published May 1, 2026 · Updated May 1, 2026

Race condition in Linux Kernel USB gadget Ethernet code allows local users to hang the system by overlapping disconnect and stop operations. gether_disconnect() leaves dev->port_usb linked until teardown ends, so concurrent eth_stop() dereferences a cleared endpoint descriptor while holding dev->lock. Triggering requires local low-privileged access and precise timing; the NULL dereference strands the competing thread on the lock and hard-locks the system.

CVSS severity4.7
Medium
EPSS probability0.09%
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 gadget Ethernet code allows local users to hang the system by overlapping disconnect and stop operations. gether_disconnect() leaves dev->port_usb linked until teardown ends, so concurrent eth_stop() dereferences a cleared endpoint descriptor while holding dev->lock. Triggering requires local low-privileged access and precise timing; the NULL dereference strands the competing thread on the lock and hard-locks the system.

The record

CVE
CVE-2026-31728
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=2.6.27
  2. Affected versionversion=2b3d942c4878084a37991a65e66512c02b8fa2ad <6ad77458637b78ec655e3da5f112c862e6690a9d
  3. Affected versionversion=2b3d942c4878084a37991a65e66512c02b8fa2ad <8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8
  4. Affected versionversion=2b3d942c4878084a37991a65e66512c02b8fa2ad <a259ba0bce3b192c04334499690372a250f7d0b1
  5. Affected versionversion=2b3d942c4878084a37991a65e66512c02b8fa2ad <bbb09bb89ffa571475f66daca9482b974cd29d6a
  6. Affected versionversion=2b3d942c4878084a37991a65e66512c02b8fa2ad <e1e7a66584bf0aff3becb73c19fa31527889fc9e
  7. Affected versionversion=2b3d942c4878084a37991a65e66512c02b8fa2ad <e1eabb072c75681f78312c484ccfffb7430f206e
  8. Affected versionversion=2b3d942c4878084a37991a65e66512c02b8fa2ad <f02980594deef751e42133714aee25228f1494c6
  9. Affected versionversion=2b3d942c4878084a37991a65e66512c02b8fa2ad <f6813c2b2ae78def76b69e0f9d72f80e4a1c4aca

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.27; version=2b3d942c4878084a37991a65e66512c02b8fa2ad <6ad77458637b78ec655e3da5f112c862e6690a9d; version=2b3d942c4878084a37991a65e66512c02b8fa2ad <8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8; version=2b3d942c4878084a37991a65e66512c02b8fa2ad <a259ba0bce3b192c04334499690372a250f7d0b1; version=2b3d942c4878084a37991a65e66512c02b8fa2ad <bbb09bb89ffa571475f66daca9482b974cd29d6a; version=2b3d942c4878084a37991a65e66512c02b8fa2ad <e1e7a66584bf0aff3becb73c19fa31527889fc9e; version=2b3d942c4878084a37991a65e66512c02b8fa2ad <e1eabb072c75681f78312c484ccfffb7430f206e; version=2b3d942c4878084a37991a65e66512c02b8fa2ad <f02980594deef751e42133714aee25228f1494c6; version=2b3d942c4878084a37991a65e66512c02b8fa2ad <f6813c2b2ae78def76b69e0f9d72f80e4a1c4aca

Published CVSS scores

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.

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

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

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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

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Your stack

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