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CVE-2025-40318· NVD / CVE Program· CNA Linux

Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once

Noroxi assessment

Priority: Monitor (action score 35/100)

  • 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. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 09b0cd1297b4dbfe736aeaa0ceeab2265f47f772, 0a94f7e017438935c09ef833a1aa908ad9875213, 6.1.159.

Low priority for now. Upgrade to Linux Linux 09b0cd1297b4dbfe736aeaa0ceeab2265f47f772, 0a94f7e017438935c09ef833a1aa908ad9875213, 6.1.159 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: fix race in hci_cmd_sync_dequeue_once hci_cmd_sync_dequeue_once() does lookup and then cancel the entry under two separate lock sections. Meanwhile, hci_cmd_sync_work() can also delete the same entry, leading to double list_del() and "UAF". Fix this by holding cmd_sync_work_lock across both lookup and cancel, so that the entry cannot be removed concurrently.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Dec 8, 2025
Updated
Oct 15, 2026
EPSS
0.2% · 18th percentile
CWE
—

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 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
8.8
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.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • 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.

—

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 0a94f7e017438935c09ef833a1aa908ad9875213affected · git
    • 1499f79995c7ee58e3bfeeff75f6d1b37dcda881 and later · before 932c0a4f77ac13e526fdd5b42914d29c9821d389affected · git
    • 505ea2b295929e7be2b4e1bc86ee31cb7862fb01 and later · before ae76cf6c2c842944c6514c57df54d728f1916553affected · git
    • 505ea2b295929e7be2b4e1bc86ee31cb7862fb01 and later · before 9cd536970192b72257afcdfba0bfc09993e6f19caffected · git
    • 505ea2b295929e7be2b4e1bc86ee31cb7862fb01 and later · before 09b0cd1297b4dbfe736aeaa0ceeab2265f47f772affected · git
    • 6.1.120 and later · before 6.1.159affected · semver
    • 6.6.51 and later · before 6.6.117affected · semver
    • 6.8.9 and later · before 6.9affected · semver
    • before 6.9not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-124.31.1.el10_16.12.0-124.31.1.el10_1
AlmaLinux:10kernel-docbefore 6.12.0-124.31.1.el10_16.12.0-124.31.1.el10_1
AlmaLinux:9kernelbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64kbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-corebefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-debugbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-develbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-corebefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-cross-headersbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-debugbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-debug-corebefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-debug-develbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-611.30.1.el9_75.14.0-611.30.1.el9_7

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-40316Dec 8, 2025 · drm/mediatek: Fix device use-after-free on unbind
    0Monitor
  • ← EarlierCVE-2025-40317Dec 8, 2025 · regmap: slimbus: fix bus_context pointer in regmap init calls
    31Monitor
  • Later →CVE-2025-40319Dec 8, 2025 · bpf: Sync pending IRQ work before freeing ring buffer
    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 Linux09b0cd1297b4dbfe736aeaa0ceeab2265f47f772Vendor (CNA)
Linux Linux0a94f7e017438935c09ef833a1aa908ad9875213Vendor (CNA)
Linux Linux6.1.159Vendor (CNA)
Linux Linux6.6.117Vendor (CNA)
Linux Linux6.9Vendor (CNA)
Linux Linux932c0a4f77ac13e526fdd5b42914d29c9821d389Vendor (CNA)
Linux Linux9cd536970192b72257afcdfba0bfc09993e6f19cVendor (CNA)
Linux Linuxae76cf6c2c842944c6514c57df54d728f1916553Vendor (CNA)
almalinux:kernel5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-abi-stablelists6.12.0-124.31.1.el10_1 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-doc6.12.0-124.31.1.el10_1 · AlmaLinux:10Package registry (OSV)
debian:linux6.1.159-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-570.81.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-570.81.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-570.81.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-570.81.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-570.81.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-570.81.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-570.81.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-570.81.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-570.81.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)

+4

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.
  • No account or password is required.
  • 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
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (4 more)

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

All records