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NVD / CVE Program· CNA Linux

CVE-2026-43022: Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.15% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0ad2ce230b38cd4b3f6732cc609e270461e626e5, 2969554bcfccb5c609f6b6cd4a014933f3a66dd0, 5cfa4f537a056c91ac6c09bc3ab58a4455217df7.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0ad2ce230b38cd4b3f6732cc609e270461e626e5, 2969554bcfccb5c609f6b6cd4a014933f3a66dd0, 5cfa4f537a056c91ac6c09bc3ab58a4455217df7 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: Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists hci_cmd_sync_queue_once() needs to indicate whether a queue item was added, so caller can know if callbacks are called, so it can avoid leaking resources. Change the function to return -EEXIST if queue item already exists. Modify all callsites to handle that.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 4th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-43022

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.9 and later · before 6.19.12
  • linux linux kernel6.1.120
  • linux linux kernel6.6.51
  • linux linux kernel6.8.9
  • linux linux kernel7.0

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

    • 357603f4d396d85fbf0045512efaf1d7f7394ed7, 6.9affected
    • f00f36db76eb8fd10d13e80e2590f23b5beaa54d and later · before da531f7108218ab6a779861e4646562fc769c9b3affected · git
    • 1499f79995c7ee58e3bfeeff75f6d1b37dcda881 and later · before dfee8da127bafa46530b72347bce3ccae736296daffected · git
    • 505ea2b295929e7be2b4e1bc86ee31cb7862fb01 and later · before 799e2e5fbf3f14874b5c6cc289a0dd68b2ca1979affected · git
    • 505ea2b295929e7be2b4e1bc86ee31cb7862fb01 and later · before 5cfa4f537a056c91ac6c09bc3ab58a4455217df7affected · git
    • 505ea2b295929e7be2b4e1bc86ee31cb7862fb01 and later · before 0ad2ce230b38cd4b3f6732cc609e270461e626e5affected · git
    • 505ea2b295929e7be2b4e1bc86ee31cb7862fb01 and later · before 2969554bcfccb5c609f6b6cd4a014933f3a66dd0affected · git
    • 6.1.120 and later · before 6.1.191affected · semver
    • 6.6.51 and later · before 6.6.160affected · semver
    • 6.8.9 and later · before 6.9affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.115-26.12.115-2
Debian:14linuxbefore 6.19.12-16.19.12-1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_18before 1-150700.15.3.11-150700.15.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-64kbbefore 6.4.0-150700.53.66.16.4.0-150700.53.66.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-defaultbefore 6.4.0-150700.53.66.16.4.0-150700.53.66.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-default-basebefore 6.4.0-150700.53.66.1.150700.17.39.16.4.0-150700.53.66.1.150700.17.39.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-sourcebefore 6.4.0-150700.53.66.16.4.0-150700.53.66.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-zfcpdumpbefore 6.4.0-150700.53.66.16.4.0-150700.53.66.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-docsbefore 6.4.0-150700.53.66.26.4.0-150700.53.66.2
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-obs-buildbefore 6.4.0-150700.53.66.16.4.0-150700.53.66.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-symsbefore 6.4.0-150700.53.66.16.4.0-150700.53.66.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP7kernel-azurebefore 6.4.0-150700.53.66.16.4.0-150700.53.66.1
SUSE:Linux Micro 6.0kernel-defaultbefore 6.4.0-49.16.4.0-49.1
SUSE:Linux Micro 6.0kernel-kvmsmallbefore 6.4.0-49.16.4.0-49.1
SUSE:Linux Micro 6.0kernel-rtbefore 6.4.0-49.16.4.0-49.1
SUSE:Linux Micro 6.0kernel-sourcebefore 6.4.0-49.16.4.0-49.1
SUSE:Linux Micro 6.0kernel-source-rtbefore 6.4.0-49.16.4.0-49.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43018May 1, 2026 · Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt
    35Monitor
  • ← EarlierCVE-2026-43019May 1, 2026 · Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync
    31Monitor
  • Later →CVE-2026-43023May 1, 2026 · Bluetooth: SCO: fix race conditions in sco_sock_connect()
    31Monitor

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 Linux0ad2ce230b38cd4b3f6732cc609e270461e626e5Vendor (CNA)
Linux Linux2969554bcfccb5c609f6b6cd4a014933f3a66dd0Vendor (CNA)
Linux Linux5cfa4f537a056c91ac6c09bc3ab58a4455217df7Vendor (CNA)
Linux Linux6.1.191Vendor (CNA)
Linux Linux6.6.160Vendor (CNA)
Linux Linux6.9Vendor (CNA)
Linux Linux799e2e5fbf3f14874b5c6cc289a0dd68b2ca1979Vendor (CNA)
Linux Linuxda531f7108218ab6a779861e4646562fc769c9b3Vendor (CNA)
Linux Linuxdfee8da127bafa46530b72347bce3ccae736296dVendor (CNA)
debian:linux6.12.115-2 · Debian:13Package registry (OSV)
debian:linux6.19.12-1 · Debian:14Package registry (OSV)
suse:kernel-64kb6.4.0-150700.53.66.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-default6.4.0-49.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-default-base6.4.0-150700.53.66.1.150700.17.39.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-docs6.4.0-150700.53.66.2 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-kvmsmall6.4.0-49.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7_Update_181-150700.15.3.1 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-obs-build6.4.0-150700.53.66.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-rt6.4.0-49.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source6.4.0-49.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source-rt6.4.0-49.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-syms6.4.0-150700.53.66.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-zfcpdump6.4.0-150700.53.66.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package 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.

No history yet (it accumulates with the daily EPSS job).

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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

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 (5 more)

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

All records