CVE-2026-68367

Local system crash via delayed teardown race

Published Aug 10, 2026 · Updated Aug 10, 2026

Use-after-free in the Linux kernel USB gadget f_tcm driver allows local users to crash the system during function teardown. tcm_set_alt queues delayed endpoint setup with a raw f_uas pointer, while configfs unlink can unbind and free that state before tcm_delayed_set_alt dereferences it. Exploitation requires local control of a bound USB Gadget TCM function; systems not using that target mode are unaffected.

CVSS severity5.5
Medium
EPSS probability0.18%
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 f_tcm driver allows local users to crash the system during function teardown. tcm_set_alt queues delayed endpoint setup with a raw f_uas pointer, while configfs unlink can unbind and free that state before tcm_delayed_set_alt dereferences it. Exploitation requires local control of a bound USB Gadget TCM function; systems not using that target mode are unaffected.

The record

CVE
CVE-2026-68367
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-364, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=3.5
  2. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <3118bb872c7dff653294f193d5328a476619e04d
  3. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <4c6c6a5588b9a2f8437fb794e852d05fa60ebe53
  4. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <79e2d75725c85607f8a9d87ae9cace62a19f767d
  5. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <a6eb5a0ae7cd313cfd7df78decd8f43b64c68703
  6. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <f282242906c12fd476b86757afba51f211d4f959

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=c52661d60f636d17e26ad834457db333bd1df494 <3118bb872c7dff653294f193d5328a476619e04d; version=c52661d60f636d17e26ad834457db333bd1df494 <4c6c6a5588b9a2f8437fb794e852d05fa60ebe53; version=c52661d60f636d17e26ad834457db333bd1df494 <79e2d75725c85607f8a9d87ae9cace62a19f767d; version=c52661d60f636d17e26ad834457db333bd1df494 <a6eb5a0ae7cd313cfd7df78decd8f43b64c68703; version=c52661d60f636d17e26ad834457db333bd1df494 <f282242906c12fd476b86757afba51f211d4f959

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-364Signal Handler Race Condition
T1499.004Endpoint Denial of Service: Application 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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