CVE-2026-80854Hinoki check available

Kernel crash via premature f_tcm session teardown

Published Sep 4, 2026 · Updated Sep 4, 2026

Use-after-free in Linux kernel f_tcm 3.5 through affected branch revisions allows local users to crash the kernel during LUN teardown. usbg_port_unlink decrements tpg_port_count before core_dev_del_lun drains active LUN references, letting concurrent nexus removal free sess_cmd_map while usbg_cmd work remains active. Reaching the flaw requires local gadget-management access and a last-LUN unlink race with nexus removal; the demonstrated consequence is a target-core BUG/Oops.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux kernel f_tcm 3.5 through affected branch revisions allows local users to crash the kernel during LUN teardown. usbg_port_unlink decrements tpg_port_count before core_dev_del_lun drains active LUN references, letting concurrent nexus removal free sess_cmd_map while usbg_cmd work remains active. Reaching the flaw requires local gadget-management access and a last-LUN unlink race with nexus removal; the demonstrated consequence is a target-core BUG/Oops.

The record

CVE
CVE-2026-80854
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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 <178f59a0bccd3f66cdfa5184310f31a58b7257c4
  3. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <2efbfd42441d3ef8137aff2d59e9835e1d5ae780
  4. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95
  5. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <ad6f0375d2e93a1d8c015463e5e92dfcb26e311b
  6. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <bbd6aa311a9f4dd17822c7557451458d3d2e980b
  7. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <c1f359d9a5efed458946063de65ddbeaacc4f165
  8. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <c39d0916da47d94909391876c9e5bd429ea7b1b9
  9. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <c494c5562ca69b61a82f566e3b87a445d2c28929
  10. Affected versionversion=c52661d60f636d17e26ad834457db333bd1df494 <eaa96a8458f54d6cf0954242ab8b1df2a6fccafa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=c52661d60f636d17e26ad834457db333bd1df494 <178f59a0bccd3f66cdfa5184310f31a58b7257c4; version=c52661d60f636d17e26ad834457db333bd1df494 <2efbfd42441d3ef8137aff2d59e9835e1d5ae780; version=c52661d60f636d17e26ad834457db333bd1df494 <85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95; version=c52661d60f636d17e26ad834457db333bd1df494 <ad6f0375d2e93a1d8c015463e5e92dfcb26e311b; version=c52661d60f636d17e26ad834457db333bd1df494 <bbd6aa311a9f4dd17822c7557451458d3d2e980b; version=c52661d60f636d17e26ad834457db333bd1df494 <c1f359d9a5efed458946063de65ddbeaacc4f165; version=c52661d60f636d17e26ad834457db333bd1df494 <c39d0916da47d94909391876c9e5bd429ea7b1b9; version=c52661d60f636d17e26ad834457db333bd1df494 <c494c5562ca69b61a82f566e3b87a445d2c28929; version=c52661d60f636d17e26ad834457db333bd1df494 <eaa96a8458f54d6cf0954242ab8b1df2a6fccafa

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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