NVD / CVE Program· CNA Linux

CVE-2026-64406: Bluetooth: fix UAF in bt_accept_dequeue()

Noroxi assessment

Priority: Monitor (action score 32/100)

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: 0.27% (FIRST EPSS).
Someone on the same network segment 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 0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0, 26168db1ce5a9766cde021b18e590a101c056614, 4bd0b274054f2679f28b70222b607bb0afc3ab9a; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1.

Low priority for now. Upgrade to Linux Linux 0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0, 26168db1ce5a9766cde021b18e590a101c056614, 4bd0b274054f2679f28b70222b607bb0afc3ab9a; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1 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: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.

HighCVSS 8.0 · v3.1—No exploit Fix available

Memory safety

Published: Jul 25, 2026
Updated: Oct 19, 2026
EPSS: 0.2% · 20th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 32 / 40 · 8.0 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 8.0; 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 kernel5.10.259 and later · before 5.10.261
linux linux kernel5.15.210 and later · before 5.15.212
linux linux kernel6.1.175 and later · before 6.1.178
linux linux kernel6.6.142 and later · before 6.6.145
linux linux kernel6.12.92 and later · before 6.12.96
linux linux kernel6.18.34 and later · before 6.18.39
linux linux kernel7.0.11 and later · before 7.1
linux linux kernel7.1.1 and later · before 7.1.4
linux linux kernel7.1
linux linux kernel7.2

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
- a5ca86a6097a8b030ca3226cd300b17ed330f966, 7.1affected
- 751de6ec671fe75ad9cf65a0638d2a06b6a5984d and later · before c0577c55219be42b6ea2ea8db11e85bfab6f4e8daffected · git
- 407217734835d21d4e0105ebf347860dc1806f88 and later · before 96ad400d5132eb333f28f6f1e2d58f0728ca9547affected · git
- 7eebd4c2c86f573af87ff165d08a83432eb0b919 and later · before 0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0affected · git
- 5d86d2f1b4d9a508c441d3e45277ae1a73cfed57 and later · before c66a95e60b65d876a927123b0ed36bd6177d9ca6affected · git
- 87c543e2f78d0871f271df92dab98901bbd5b6f5 and later · before 6303ed4bbe0095f4cc195225479bf506e010d1dbaffected · git
- added1213395071470a900cc845a042fb51882a6 and later · before 26168db1ce5a9766cde021b18e590a101c056614affected · git
- ab1513597c6cf17cd1ad2a21e3b045421b48e022 and later · before 50c662bdcd51b03033a0abed6716bfd377ba1049affected · git
- ab1513597c6cf17cd1ad2a21e3b045421b48e022 and later · before 4bd0b274054f2679f28b70222b607bb0afc3ab9aaffected · git
- 5.10.259 and later · before 5.10.261affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.180-1	6.1.180-1
Debian:12	linux-6.12	before 6.12.100-1~deb12u1	6.12.100-1~deb12u1
Debian:13	linux	before 6.12.96-1	6.12.96-1
Debian:14	linux	before 7.1.4-1	7.1.4-1

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-2026-64404Jul 25, 2026 · Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()
22Monitor
← EarlierCVE-2026-64405Jul 25, 2026 · Bluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()
22Monitor
Later →CVE-2026-64408Jul 25, 2026 · Bluetooth: bnep: pin L2CAP connection during netdev registration
35Monitor

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	0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0	Vendor (CNA)
Linux Linux	26168db1ce5a9766cde021b18e590a101c056614	Vendor (CNA)
Linux Linux	4bd0b274054f2679f28b70222b607bb0afc3ab9a	Vendor (CNA)
Linux Linux	5.10.261	Vendor (CNA)
Linux Linux	5.15.212	Vendor (CNA)
Linux Linux	50c662bdcd51b03033a0abed6716bfd377ba1049	Vendor (CNA)
Linux Linux	6.1.178	Vendor (CNA)
Linux Linux	6.12.96	Vendor (CNA)
Linux Linux	6.18.39	Vendor (CNA)
Linux Linux	6.6.145	Vendor (CNA)
Linux Linux	6303ed4bbe0095f4cc195225479bf506e010d1db	Vendor (CNA)
Linux Linux	7.1	Vendor (CNA)
Linux Linux	96ad400d5132eb333f28f6f1e2d58f0728ca9547	Vendor (CNA)
Linux Linux	c0577c55219be42b6ea2ea8db11e85bfab6f4e8d	Vendor (CNA)
Linux Linux	c66a95e60b65d876a927123b0ed36bd6177d9ca6	Vendor (CNA)
azl3 kernel 6.6.144.1-1 on Azure Linux 3.0	6.6.145.2-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.180-1 · Debian:12	Package registry (OSV)
debian:linux-6.12	6.12.100-1~deb12u1 · Debian:12	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.

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).

Technical details

Attack conditions

Someone on the same network segment 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: Adjacent
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:A/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, 10:11 PM UTC

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

References

git.kernel.org/stable/c/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0

Show all references (7 more)

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

All records