CVE-2026-80923

Use-after-free via dangling debug TTY driver

Published Sep 9, 2026 · Updated Sep 9, 2026

Use-after-free in the Linux kernel allows attackers to cause an unspecified impact via xHCI debug TTY module unloading. If tty_register_driver() fails, dbc_tty_init() releases the driver but leaves dbc_tty_driver pointing to freed memory, and dbc_tty_exit() later passes that dangling pointer to tty_unregister_driver(). The failure must precede module unload; the Linux kernel CVE team has not published a more specific security consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
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 allows attackers to cause an unspecified impact via xHCI debug TTY module unloading. If tty_register_driver() fails, dbc_tty_init() releases the driver but leaves dbc_tty_driver pointing to freed memory, and dbc_tty_exit() later passes that dangling pointer to tty_unregister_driver(). The failure must precede module unload; the Linux kernel CVE team has not published a more specific security consequence.

The record

CVE
CVE-2026-80923
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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?

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  1. Affected versionversion=4521f16139409cdf9462c7325d43454462cff6c3 <01b7bc0938061f2fd46e0094f6483d8c6c02f7d3
  2. Affected versionversion=4521f16139409cdf9462c7325d43454462cff6c3 <0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922
  3. Affected versionversion=4521f16139409cdf9462c7325d43454462cff6c3 <0e469b94fbba8eb03666da41dd1082b793c50c1a
  4. Affected versionversion=4521f16139409cdf9462c7325d43454462cff6c3 <33ed35ca629477f57e0dd1d77d6df96cf5a9eb55
  5. Affected versionversion=4521f16139409cdf9462c7325d43454462cff6c3 <43635ff6401ca0e0ed21875379eeded921321525
  6. Affected versionversion=4521f16139409cdf9462c7325d43454462cff6c3 <943f976c93e70563b132f5585ff68b08c89641a2
  7. Affected versionversion=4521f16139409cdf9462c7325d43454462cff6c3 <a916fa66a43e10f63198b6ce978badffc678821a
  8. Affected versionversion=4521f16139409cdf9462c7325d43454462cff6c3 <eaca2814f32b9872a332326324b9e83e01f156d2
  9. Affected versionversion=5.9

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4521f16139409cdf9462c7325d43454462cff6c3 <01b7bc0938061f2fd46e0094f6483d8c6c02f7d3; version=4521f16139409cdf9462c7325d43454462cff6c3 <0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922; version=4521f16139409cdf9462c7325d43454462cff6c3 <0e469b94fbba8eb03666da41dd1082b793c50c1a; version=4521f16139409cdf9462c7325d43454462cff6c3 <33ed35ca629477f57e0dd1d77d6df96cf5a9eb55; version=4521f16139409cdf9462c7325d43454462cff6c3 <43635ff6401ca0e0ed21875379eeded921321525; version=4521f16139409cdf9462c7325d43454462cff6c3 <943f976c93e70563b132f5585ff68b08c89641a2; version=4521f16139409cdf9462c7325d43454462cff6c3 <a916fa66a43e10f63198b6ce978badffc678821a; version=4521f16139409cdf9462c7325d43454462cff6c3 <eaca2814f32b9872a332326324b9e83e01f156d2; version=5.9

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

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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)
VectorUnavailable
PrivilegesUnavailable
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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