CVE-2026-43343

USB gadget reconfiguration denial via leaked reference

Published May 8, 2026 · Updated May 8, 2026

Reference-count cleanup failure in affected Linux Kernel branches allows local users to block USB gadget configfs attribute changes. geth_alloc increments the f_subset function reference count, but geth_free does not decrement it after the function is unlinked, leaving cleanup unbalanced. Exploitation requires local ability to manage USB gadget functions through configfs, and the reported consequence is limited to blocking subsequent attribute configuration.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reference-count cleanup failure in affected Linux Kernel branches allows local users to block USB gadget configfs attribute changes. geth_alloc increments the f_subset function reference count, but geth_free does not decrement it after the function is unlinked, leaving cleanup unbalanced. Exploitation requires local ability to manage USB gadget functions through configfs, and the reported consequence is limited to blocking subsequent attribute configuration.

The record

CVE
CVE-2026-43343
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=02832e56f88a981474ee4c7c141f46fc1b4454f4 <23e4851ce348a329d974e84e828155dda9f52122
  2. Affected versionversion=02832e56f88a981474ee4c7c141f46fc1b4454f4 <3d436670b47415da042452618fb5d8e317ab095f
  3. Affected versionversion=02832e56f88a981474ee4c7c141f46fc1b4454f4 <3f5bfc550a40d7493b1cf09540ed6b412b3b82be
  4. Affected versionversion=02832e56f88a981474ee4c7c141f46fc1b4454f4 <75776a055b656873319c3830fed471daef3ceb23
  5. Affected versionversion=02832e56f88a981474ee4c7c141f46fc1b4454f4 <a932b171554714b1bca313b853c7aa9f2930f9aa
  6. Affected versionversion=02832e56f88a981474ee4c7c141f46fc1b4454f4 <caa27923aacd8a5869207842f2ab1657c6c0c7bc
  7. Affected versionversion=02832e56f88a981474ee4c7c141f46fc1b4454f4 <cc8ec610cd14c093a19371691a7ce1ee5421e829
  8. Affected versionversion=02832e56f88a981474ee4c7c141f46fc1b4454f4 <d7d702407b61e96286a15b6e715572f541a8d41c
  9. Affected versionversion=3.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=02832e56f88a981474ee4c7c141f46fc1b4454f4 <23e4851ce348a329d974e84e828155dda9f52122; version=02832e56f88a981474ee4c7c141f46fc1b4454f4 <3d436670b47415da042452618fb5d8e317ab095f; version=02832e56f88a981474ee4c7c141f46fc1b4454f4 <3f5bfc550a40d7493b1cf09540ed6b412b3b82be; version=02832e56f88a981474ee4c7c141f46fc1b4454f4 <75776a055b656873319c3830fed471daef3ceb23; version=02832e56f88a981474ee4c7c141f46fc1b4454f4 <a932b171554714b1bca313b853c7aa9f2930f9aa; version=02832e56f88a981474ee4c7c141f46fc1b4454f4 <caa27923aacd8a5869207842f2ab1657c6c0c7bc; version=02832e56f88a981474ee4c7c141f46fc1b4454f4 <cc8ec610cd14c093a19371691a7ce1ee5421e829; version=02832e56f88a981474ee4c7c141f46fc1b4454f4 <d7d702407b61e96286a15b6e715572f541a8d41c; version=3.11

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 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

No sourced classifications are available.

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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