Upstream information

CVE-2026-98809 at MITRE

Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sync: don't drain cmd_sync backlog on unregister

hci_unregister_dev() disables cmd_work and cmd_timer, then calls
hci_cmd_sync_clear(), whose cancel_work_sync() waits for
hci_cmd_sync_work() to return. That worker dequeues and runs every
entry on cmd_sync_work_list. With cmd_work disabled nothing reaches
the controller, so each queued HCI command waits the full
HCI_CMD_TIMEOUT (2s).

The backlog has no bound. Userspace can keep queuing MGMT commands
such as MGMT_OP_GET_CLOCK_INFO against a controller that doesn't
answer. Closing /dev/vhci then blocks in vhci_release() for
backlog * 2s:

INFO: task syz-executor:5749 blocked for more than 143 seconds.
cancel_work_sync
hci_cmd_sync_clear
hci_unregister_dev
vhci_release

In a local reproduction the backlog held more than 5000 entries,
which comes to hours of hang.

Stop the worker from taking new entries once HCI_UNREGISTER is set,
and wake any request still waiting with -ENODEV before cancelling
the work. The entries left over are destroyed with -ECANCELED by the
existing sweep in hci_cmd_sync_clear(). They stay on the list until
the work has stopped, so hci_cmd_sync_dequeue() and friends still see
them. A callback already running may still issue another command,
which delays unregister by at most one timeout per remaining command,
not by the whole backlog.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having low severity.

CVSS v3 Scores
CVSS detail SUSE
Base Score 3.3
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact Low
CVSSv3 Version 3.1

Note from the SUSE Security Team on the kernel-default package

SUSE will no longer fix all CVEs in the Linux Kernel anymore, but declare some bug classes as won't fix. Please refer to TID 21496 for more details.

SUSE Bugzilla entry: 1286775 [NEW]

No SUSE Security Announcements cross referenced.

List of packages in QA

Product(s) Package(s)
SUSE Linux Enterprise High Availability Extension 15 SP7
  • cluster-md-kmp-default >= 6.4.0-150700.53.90.1
  • dlm-kmp-default >= 6.4.0-150700.53.90.1
  • gfs2-kmp-default >= 6.4.0-150700.53.90.1
  • ocfs2-kmp-default >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Module for Basesystem 15 SP7
  • kernel-64kb >= 6.4.0-150700.53.90.1
  • kernel-64kb-devel >= 6.4.0-150700.53.90.1
  • kernel-default >= 6.4.0-150700.53.90.1
  • kernel-default-base >= 6.4.0-150700.53.90.1.150700.17.51.1
  • kernel-default-devel >= 6.4.0-150700.53.90.1
  • kernel-devel >= 6.4.0-150700.53.90.1
  • kernel-macros >= 6.4.0-150700.53.90.1
  • kernel-zfcpdump >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Server 15 SP7
  • kernel-64kb >= 6.4.0-150700.53.90.1
  • kernel-64kb-devel >= 6.4.0-150700.53.90.1
  • kernel-default >= 6.4.0-150700.53.90.1
  • kernel-default-base >= 6.4.0-150700.53.90.1.150700.17.51.1
  • kernel-default-devel >= 6.4.0-150700.53.90.1
  • kernel-devel >= 6.4.0-150700.53.90.1
  • kernel-macros >= 6.4.0-150700.53.90.1
  • kernel-zfcpdump >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Desktop 15 SP7
  • kernel-64kb >= 6.4.0-150700.53.90.1
  • kernel-64kb-devel >= 6.4.0-150700.53.90.1
  • kernel-default >= 6.4.0-150700.53.90.1
  • kernel-default-base >= 6.4.0-150700.53.90.1.150700.17.51.1
  • kernel-default-devel >= 6.4.0-150700.53.90.1
  • kernel-devel >= 6.4.0-150700.53.90.1
  • kernel-macros >= 6.4.0-150700.53.90.1
  • kernel-zfcpdump >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • kernel-64kb >= 6.4.0-150700.53.90.1
  • kernel-64kb-devel >= 6.4.0-150700.53.90.1
  • kernel-default >= 6.4.0-150700.53.90.1
  • kernel-default-base >= 6.4.0-150700.53.90.1.150700.17.51.1
  • kernel-default-devel >= 6.4.0-150700.53.90.1
  • kernel-devel >= 6.4.0-150700.53.90.1
  • kernel-macros >= 6.4.0-150700.53.90.1
  • kernel-zfcpdump >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Module for Development Tools 15 SP7
  • kernel-docs >= 6.4.0-150700.53.90.1
  • kernel-obs-build >= 6.4.0-150700.53.90.1
  • kernel-source >= 6.4.0-150700.53.90.1
  • kernel-syms >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Server 15 SP7
  • kernel-docs >= 6.4.0-150700.53.90.1
  • kernel-obs-build >= 6.4.0-150700.53.90.1
  • kernel-source >= 6.4.0-150700.53.90.1
  • kernel-syms >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Desktop 15 SP7
  • kernel-docs >= 6.4.0-150700.53.90.1
  • kernel-obs-build >= 6.4.0-150700.53.90.1
  • kernel-source >= 6.4.0-150700.53.90.1
  • kernel-syms >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • kernel-docs >= 6.4.0-150700.53.90.1
  • kernel-obs-build >= 6.4.0-150700.53.90.1
  • kernel-source >= 6.4.0-150700.53.90.1
  • kernel-syms >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Module for Legacy 15 SP7
  • reiserfs-kmp-default >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Server 15 SP7
  • reiserfs-kmp-default >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • reiserfs-kmp-default >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Module for Public Cloud 15 SP7
  • kernel-azure >= 6.4.0-150700.53.90.1
  • kernel-azure-devel >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Server 15 SP7
  • kernel-azure >= 6.4.0-150700.53.90.1
  • kernel-azure-devel >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • kernel-azure >= 6.4.0-150700.53.90.1
  • kernel-azure-devel >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Workstation Extension 15 SP7
  • kernel-default-extra >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Server 15 SP7
  • kernel-default-extra >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • kernel-default-extra >= 6.4.0-150700.53.90.1
SUSE Linux Enterprise Desktop 15 SP7
  • kernel-default-extra >= 6.4.0-150700.53.90.1

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP7 kernel-64kb In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-default In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-default-base In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-docs In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-obs-build In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-source In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-syms In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-zfcpdump In progress
SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-default In progress
SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-source Affected
SUSE Linux Enterprise High Availability Extension 16.0 kernel-default Not affected
SUSE Linux Enterprise High Availability Extension 16.0 kernel-source Not affected
SUSE Linux Enterprise Micro 5.4 kernel-default Not affected
SUSE Linux Enterprise Micro 5.4 kernel-rt Not affected
SUSE Linux Enterprise Micro 5.4 kernel-source Not affected
SUSE Linux Enterprise Micro 5.4 kernel-source-rt Not affected
SUSE Linux Enterprise Micro 5.5 kernel-default Not affected
SUSE Linux Enterprise Micro 5.5 kernel-source Not affected
SUSE Linux Enterprise Micro 5.5 kernel-source-rt Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-64kb In progress
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-default In progress
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-default-base In progress
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-source In progress
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-zfcpdump In progress
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-default Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-docs In progress
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-obs-build In progress
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-source In progress
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-syms In progress
SUSE Linux Enterprise Module for Legacy 15 SP7 kernel-default In progress
SUSE Linux Enterprise Module for Public Cloud 15 SP7 kernel-azure In progress
SUSE Linux Enterprise Real Time 15 SP7 kernel-source-rt In progress
SUSE Linux Enterprise Server 15 SP7 kernel-64kb In progress
SUSE Linux Enterprise Server 15 SP7 kernel-azure In progress
SUSE Linux Enterprise Server 15 SP7 kernel-default In progress
SUSE Linux Enterprise Server 15 SP7 kernel-default-base In progress
SUSE Linux Enterprise Server 15 SP7 kernel-docs In progress
SUSE Linux Enterprise Server 15 SP7 kernel-obs-build In progress
SUSE Linux Enterprise Server 15 SP7 kernel-source In progress
SUSE Linux Enterprise Server 15 SP7 kernel-syms In progress
SUSE Linux Enterprise Server 15 SP7 kernel-zfcpdump In progress
SUSE Linux Enterprise Server 16.0 kernel-default Not affected
SUSE Linux Enterprise Server 16.0 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-64kb In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-azure In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-default In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-default-base In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-docs In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-obs-build In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-source In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-syms In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-zfcpdump In progress
SUSE Linux Enterprise Server for SAP applications 16.0 kernel-default Not affected
SUSE Linux Enterprise Server for SAP applications 16.0 kernel-source Not affected
SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-default In progress
SUSE Linux Micro 6.0 kernel-default Affected
SUSE Linux Micro 6.0 kernel-source Affected
SUSE Linux Micro 6.0 kernel-source-rt Affected
SUSE Linux Micro 6.1 kernel-default Affected
SUSE Linux Micro 6.1 kernel-source Affected
SUSE Linux Micro 6.1 kernel-source-rt Affected
SUSE Linux Micro 6.2 kernel-default Not affected
SUSE Linux Micro 6.2 kernel-source Not affected
SUSE Linux Micro Extras 6.0 kernel-default Affected
SUSE Linux Micro Extras 6.0 kernel-source Affected
SUSE Linux Micro Extras 6.0 kernel-source-rt Affected
SUSE Linux Micro Extras 6.1 kernel-default Affected
SUSE Linux Micro Extras 6.1 kernel-source Affected
SUSE Real Time Module 15 SP7 kernel-source-rt In progress
openSUSE Leap 16.0 kernel-source Not affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-default Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-default Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-source Not affected
SUSE Linux Enterprise Server 12 SP5 kernel-source Not affected
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP5-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP6-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP6-LTSS kernel-source Affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 kernel-default Not affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-default Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-default Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-source Affected
Products past their end of life and not receiving proactive updates anymore.
SUSE CaaS Platform 4.0 kernel-source Not affected
SUSE Enterprise Storage 6 kernel-source Not affected
SUSE Enterprise Storage 7 kernel-source Not affected
SUSE Enterprise Storage 7.1 kernel-source Not affected
SUSE Linux Enterprise Desktop 11 SP4 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP3 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP6 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP1 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP3 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-source Not affected
SUSE Linux Enterprise Micro 5.0 kernel-default Not affected
SUSE Linux Enterprise Micro 5.1 kernel-default Not affected
SUSE Linux Enterprise Micro 5.2 kernel-default Not affected
SUSE Linux Enterprise Micro 5.2 kernel-source Not affected
SUSE Linux Enterprise Micro 5.3 kernel-default Not affected
SUSE Linux Enterprise Micro 5.3 kernel-rt Not affected
SUSE Linux Enterprise Micro 5.3 kernel-source Not affected
SUSE Linux Enterprise Micro 5.3 kernel-source-rt Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP3 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP6 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP3 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP6 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Real Time 15 SP3 kernel-source Not affected
SUSE Linux Enterprise Real Time 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Real Time 15 SP4 kernel-source-rt Not affected
SUSE Linux Enterprise Real Time 15 SP5 kernel-source-rt Not affected
SUSE Linux Enterprise Server 11 SP4 kernel-source Not affected
SUSE Linux Enterprise Server 11 SP4-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP1-BCL kernel-source Not affected
SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP1-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP2-BCL kernel-source Not affected
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP3 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP3-BCL kernel-source Not affected
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP6 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-source Not affected
SUSE Manager Proxy 4.0 kernel-source Not affected
SUSE Manager Proxy 4.1 kernel-source Not affected
SUSE Manager Proxy 4.2 kernel-source Not affected
SUSE Manager Proxy 4.3 kernel-source Not affected
SUSE Manager Proxy LTS 4.3 kernel-source Not affected
SUSE Manager Retail Branch Server 4.0 kernel-source Not affected
SUSE Manager Retail Branch Server 4.1 kernel-source Not affected
SUSE Manager Retail Branch Server 4.2 kernel-source Not affected
SUSE Manager Retail Branch Server 4.3 kernel-source Not affected
SUSE Manager Retail Branch Server LTS 4.3 kernel-source Not affected
SUSE Manager Server 4.0 kernel-source Not affected
SUSE Manager Server 4.1 kernel-source Not affected
SUSE Manager Server 4.2 kernel-source Not affected
SUSE Manager Server 4.3 kernel-source Not affected
SUSE Manager Server LTS 4.3 kernel-source Not affected
SUSE Real Time Module 15 SP4 kernel-source-rt Not affected
SUSE Real Time Module 15 SP5 kernel-source-rt Not affected
openSUSE Leap 15.3 kernel-source Not affected
openSUSE Leap 15.4 kernel-source Not affected
openSUSE Leap 15.4 kernel-source-rt Not affected
openSUSE Leap 15.5 kernel-source Not affected
openSUSE Leap 15.5 kernel-source-rt Not affected
openSUSE Leap 15.6 kernel-source Affected

SUSE Timeline for this CVE

CVE page created: Thu Oct 22 15:50:45 2026
CVE page last modified: Sat Oct 31 13:54:36 2026