NVD / CVE Program· CNA Linux

CVE-2026-43019: Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync

Noroxi assessment

Priority: Monitor (action score 31/100)

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: 0.10% (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 6.5, 6.6, 66d432e9b45bae7881ffcdb12cd8fd0bf254ef02.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 6.5, 6.6, 66d432e9b45bae7881ffcdb12cd8fd0bf254ef02 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_conn: fix potential UAF in set_cig_params_sync hci_conn lookup and field access must be covered by hdev lock in set_cig_params_sync, otherwise it's possible it is freed concurrently. Take hdev lock to prevent hci_conn from being deleted or modified concurrently. Just RCU lock is not suitable here, as we also want to avoid "tearing" in the configuration.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: May 1, 2026
Updated: Oct 19, 2026
EPSS: 0.1% · 0th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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.

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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel6.6 and later · before 6.12.81
linux linux kernel6.13 and later · before 6.18.22
linux linux kernel6.19 and later · before 6.19.12
linux linux kernel6.4.16
linux linux kernel6.5.3
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
- 3a273cd0f47dd672d37736e623849374f9ab9ce9, d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062, 6.6affected
- a091289218202bc09d9b9caa8afcde1018584aec and later · before 7502c1cf303b69f71d085f5ff7251b0e1b0f09dfaffected · git
- a091289218202bc09d9b9caa8afcde1018584aec and later · before 66d432e9b45bae7881ffcdb12cd8fd0bf254ef02affected · git
- a091289218202bc09d9b9caa8afcde1018584aec and later · before 7d568fede8eac91161a60b710aa920abe9b0fb9faffected · git
- a091289218202bc09d9b9caa8afcde1018584aec and later · before bad65b4b0a96139f023eadc28a33125963208449affected · git
- a091289218202bc09d9b9caa8afcde1018584aec and later · before a2639a7f0f5bf7d73f337f8f077c19415c62ed2caffected · git
- 6.4.16 and later · before 6.5affected · semver
- 6.5.3 and later · before 6.6affected · semver
- before 6.6not affected · semver
- 6.6.143 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:13	linux	before 6.12.85-1	6.12.85-1
Debian:14	linux	before 6.19.12-1	6.19.12-1
SUSE:Linux Micro 6.0	kernel-default	before 6.4.0-50.1	6.4.0-50.1
SUSE:Linux Micro 6.0	kernel-kvmsmall	before 6.4.0-50.1	6.4.0-50.1
SUSE:Linux Micro 6.0	kernel-rt	before 6.4.0-50.1	6.4.0-50.1
SUSE:Linux Micro 6.0	kernel-source	before 6.4.0-50.2	6.4.0-50.2
SUSE:Linux Micro 6.0	kernel-source-rt	before 6.4.0-50.2	6.4.0-50.2

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-2026-43016May 1, 2026 · bpf: sockmap: Fix use-after-free of sk->sk_socket in sk_psock_verdict_data_ready().
31Monitor
← EarlierCVE-2026-43018May 1, 2026 · Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt
35Monitor
Later →CVE-2026-43022May 1, 2026 · Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists
22Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
Linux Linux	6.5	Vendor (CNA)
Linux Linux	6.6	Vendor (CNA)
Linux Linux	66d432e9b45bae7881ffcdb12cd8fd0bf254ef02	Vendor (CNA)
Linux Linux	7502c1cf303b69f71d085f5ff7251b0e1b0f09df	Vendor (CNA)
Linux Linux	7d568fede8eac91161a60b710aa920abe9b0fb9f	Vendor (CNA)
Linux Linux	a2639a7f0f5bf7d73f337f8f077c19415c62ed2c	Vendor (CNA)
Linux Linux	bad65b4b0a96139f023eadc28a33125963208449	Vendor (CNA)
debian:linux	6.12.85-1 · Debian:13	Package registry (OSV)
suse:kernel-default	6.4.0-50.1 · SUSE:Linux Micro 6.0	Package registry (OSV)
suse:kernel-kvmsmall	6.4.0-50.1 · SUSE:Linux Micro 6.0	Package registry (OSV)
suse:kernel-rt	6.4.0-50.1 · SUSE:Linux Micro 6.0	Package registry (OSV)
suse:kernel-source	6.4.0-50.2 · SUSE:Linux Micro 6.0	Package registry (OSV)
suse:kernel-source-rt	6.4.0-50.2 · SUSE:Linux Micro 6.0	Package 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.

TR-26-0143 · May 4, 2026(Linux Kernel Güvenlik Bildirimi)

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

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

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:09 PM UTC

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

References

git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02

Show all references (4 more)

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

All records