CVE-2026-98290Public exploit

Potential RFCOMM hang via listener-cleanup lock inversion

Published Oct 6, 2026 · Updated Oct 6, 2026

A lock-order inversion in Linux kernel Bluetooth RFCOMM exposes listener cleanup to a possible service hang during connection handling. The rfcomm_sock_cleanup_listen() path closes queued child sockets while rfcomm_sock_close() holds a child socket lock and rfcomm_dlc_close() requests rfcomm_mutex, opposite the RFCOMM worker's lock order. The risk requires a listening RFCOMM socket with unaccepted children and overlapping cleanup and connection activity; the public reproducer establishes a lockdep warning, not a confirmed system-wide hang.

CVSS severityUnavailable
Unscored
EPSS probability0.26%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A lock-order inversion in Linux kernel Bluetooth RFCOMM exposes listener cleanup to a possible service hang during connection handling. The rfcomm_sock_cleanup_listen() path closes queued child sockets while rfcomm_sock_close() holds a child socket lock and rfcomm_dlc_close() requests rfcomm_mutex, opposite the RFCOMM worker's lock order. The risk requires a listening RFCOMM socket with unaccepted children and overlapping cleanup and connection activity; the public reproducer establishes a lockdep warning, not a confirmed system-wide hang.

The record

CVE
CVE-2026-98290
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=5.15
  2. Affected versionversion=b7ce436a5d798bc59e71797952566608a4b4626b <18174b166547ef41973cc19feb5ef9cab39a8def
  3. Affected versionversion=b7ce436a5d798bc59e71797952566608a4b4626b <4aafb47301a799d3e01230d6568c4e93524e1523
  4. Affected versionversion=b7ce436a5d798bc59e71797952566608a4b4626b <801fb950cae7048eb7d83b18857d1ca37b8cd5a4
  5. Affected versionversion=b7ce436a5d798bc59e71797952566608a4b4626b <bfce253f039eb5f58b810af267942a9f59207254
  6. Affected versionversion=b7ce436a5d798bc59e71797952566608a4b4626b <c6792c441767256030606eb82dca5d5fc360dd9a
  7. Affected versionversion=b7ce436a5d798bc59e71797952566608a4b4626b <c741977e413f5b49d306700820fb55ccb8269f5a
  8. Affected versionversion=b7ce436a5d798bc59e71797952566608a4b4626b <eb4adaa46e4c9e6efa7be3ce06398f4d7c39b57c

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=b7ce436a5d798bc59e71797952566608a4b4626b <18174b166547ef41973cc19feb5ef9cab39a8def; version=b7ce436a5d798bc59e71797952566608a4b4626b <4aafb47301a799d3e01230d6568c4e93524e1523; version=b7ce436a5d798bc59e71797952566608a4b4626b <801fb950cae7048eb7d83b18857d1ca37b8cd5a4; version=b7ce436a5d798bc59e71797952566608a4b4626b <bfce253f039eb5f58b810af267942a9f59207254; version=b7ce436a5d798bc59e71797952566608a4b4626b <c6792c441767256030606eb82dca5d5fc360dd9a; version=b7ce436a5d798bc59e71797952566608a4b4626b <c741977e413f5b49d306700820fb55ccb8269f5a; version=b7ce436a5d798bc59e71797952566608a4b4626b <eb4adaa46e4c9e6efa7be3ce06398f4d7c39b57c

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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Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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