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CVE-2026-80923· NVD / CVE Program· CNA Linux

xhci: dbgtty: Fix unregister on tty_register_driver() failure

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Fixed version: Linux Linux 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3, 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922, 0e469b94fbba8eb03666da41dd1082b793c50c1a; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3, 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922, 0e469b94fbba8eb03666da41dd1082b793c50c1a; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: xhci: dbgtty: Fix unregister on tty_register_driver() failure If tty_register_driver() fails, it drops the reference, but fails to set the global dbc_tty_driver to NULL, causing the unregister to be called again when module exits. On module unload dbc_tty_exit() only gates its cleanup on the driver pointer being non-NULL, so it operates on the already-freed driver: module_init(xhci_hcd_init) xhci_hcd_init() xhci_dbc_init() [return value ignored] dbc_tty_init() tty_register_driver() fails tty_driver_kref_put() -> driver freed (dbc_tty_driver left dangling) ... module_exit(xhci_hcd_fini) xhci_hcd_fini() xhci_dbc_exit() dbc_tty_exit() if (dbc_tty_driver) -> true (dangling) tty_unregister_driver() -> use-after-free

—No exploit Fix available
Published
Sep 9, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.9affected
    • 4521f16139409cdf9462c7325d43454462cff6c3 and later · before 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3affected · git
    • 4521f16139409cdf9462c7325d43454462cff6c3 and later · before 43635ff6401ca0e0ed21875379eeded921321525affected · git
    • 4521f16139409cdf9462c7325d43454462cff6c3 and later · before eaca2814f32b9872a332326324b9e83e01f156d2affected · git
    • 4521f16139409cdf9462c7325d43454462cff6c3 and later · before 943f976c93e70563b132f5585ff68b08c89641a2affected · git
    • 4521f16139409cdf9462c7325d43454462cff6c3 and later · before 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922affected · git
    • 4521f16139409cdf9462c7325d43454462cff6c3 and later · before 33ed35ca629477f57e0dd1d77d6df96cf5a9eb55affected · git
    • 4521f16139409cdf9462c7325d43454462cff6c3 and later · before 0e469b94fbba8eb03666da41dd1082b793c50c1aaffected · git
    • 4521f16139409cdf9462c7325d43454462cff6c3 and later · before a916fa66a43e10f63198b6ce978badffc678821aaffected · git
    • before 5.9not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.1.13-17.1.13-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80921Sep 9, 2026 · KVM: s390: vsie: zero stale crypto bits
    35Monitor
  • ← EarlierCVE-2026-80922Sep 9, 2026 · crypto: qcom-rng - Allow zero as a random number
    0Monitor
  • Later →CVE-2026-80924Sep 9, 2026 · crypto: krb5 - use kfree_sensitive() for derived key buffers
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux01b7bc0938061f2fd46e0094f6483d8c6c02f7d3Vendor (CNA)
Linux Linux0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922Vendor (CNA)
Linux Linux0e469b94fbba8eb03666da41dd1082b793c50c1aVendor (CNA)
Linux Linux33ed35ca629477f57e0dd1d77d6df96cf5a9eb55Vendor (CNA)
Linux Linux43635ff6401ca0e0ed21875379eeded921321525Vendor (CNA)
Linux Linux943f976c93e70563b132f5585ff68b08c89641a2Vendor (CNA)
Linux Linuxa916fa66a43e10f63198b6ce978badffc678821aVendor (CNA)
Linux Linuxeaca2814f32b9872a332326324b9e83e01f156d2Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records