CVE-2026-64346

Local system crash via UDC lifetime race

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the Linux Kernel USB gadget UDC allows local users to crash the system through concurrent configfs and mode-switch operations. The race lets usb_del_gadget() free the udc structure while gadget_match_driver() still dereferences it, producing a NULL pointer dereference. Low-privilege local access capable of driving configfs alongside a USB mode switch is required, and the documented consequence is a kernel crash.

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

What happened

Use-after-free in the Linux Kernel USB gadget UDC allows local users to crash the system through concurrent configfs and mode-switch operations. The race lets usb_del_gadget() free the udc structure while gadget_match_driver() still dereferences it, producing a NULL pointer dereference. Low-privilege local access capable of driving configfs alongside a USB mode switch is required, and the documented consequence is a kernel crash.

The record

CVE
CVE-2026-64346
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=0 <5.15.212
  2. Affected versionversion=0 <6.1.178
  3. Affected versionversion=0 <6.12.96
  4. Affected versionversion=0 <6.18.39
  5. Affected versionversion=0 <6.6.145
  6. Affected versionversion=0 <7.1.4
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <50eeb8e8a4f389efc91b93cff14a683e714ec194
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <54fa390aae393eb130f307a85562e3001cc39a52
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea
  10. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7a5214dae906d9f58e07bc4995e8181ee74439f4
  11. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b52476a83d9e12df00765359d728a875b128bef1
  12. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d026f71df141c9b064ff32a78af5391a31ef75c2
  13. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f845852a5a8914277031f47d8de0f350fef52405

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0 <5.15.212; version=0 <6.1.178; version=0 <6.12.96; version=0 <6.18.39; version=0 <6.6.145; version=0 <7.1.4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <50eeb8e8a4f389efc91b93cff14a683e714ec194; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <54fa390aae393eb130f307a85562e3001cc39a52; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7a5214dae906d9f58e07bc4995e8181ee74439f4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b52476a83d9e12df00765359d728a875b128bef1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d026f71df141c9b064ff32a78af5391a31ef75c2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f845852a5a8914277031f47d8de0f350fef52405

Published CVSS scores

5.5Red HatCVSS: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

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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