CVE-2025-40318

Kernel memory corruption via Bluetooth dequeue race

Published Dec 8, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel 6.9 Bluetooth HCI command synchronization allows physically proximate attackers to corrupt kernel memory. A race lets hci_cmd_sync_dequeue_once() look up and cancel an entry in separate lock sections while hci_cmd_sync_work() deletes it, causing double list_del(). Bluetooth reachability and winning the race are required; the resulting use-after-free can crash the kernel or corrupt kernel memory.

CVSS severity8.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel 6.9 Bluetooth HCI command synchronization allows physically proximate attackers to corrupt kernel memory. A race lets hci_cmd_sync_dequeue_once() look up and cancel an entry in separate lock sections while hci_cmd_sync_work() deletes it, causing double list_del(). Bluetooth reachability and winning the race are required; the resulting use-after-free can crash the kernel or corrupt kernel memory.

The record

CVE
CVE-2025-40318
Published
Dec 8, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1499f79995c7ee58e3bfeeff75f6d1b37dcda881 <932c0a4f77ac13e526fdd5b42914d29c9821d389
  2. Affected versionversion=357603f4d396d85fbf0045512efaf1d7f7394ed7
  3. Affected versionversion=505ea2b295929e7be2b4e1bc86ee31cb7862fb01 <09b0cd1297b4dbfe736aeaa0ceeab2265f47f772
  4. Affected versionversion=505ea2b295929e7be2b4e1bc86ee31cb7862fb01 <9cd536970192b72257afcdfba0bfc09993e6f19c
  5. Affected versionversion=505ea2b295929e7be2b4e1bc86ee31cb7862fb01 <ae76cf6c2c842944c6514c57df54d728f1916553
  6. Affected versionversion=6.1.120 <6.1.159
  7. Affected versionversion=6.6.51 <6.6.117
  8. Affected versionversion=6.8.9 <6.9
  9. Affected versionversion=6.9
  10. Affected versionversion=f00f36db76eb8fd10d13e80e2590f23b5beaa54d <0a94f7e017438935c09ef833a1aa908ad9875213

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1499f79995c7ee58e3bfeeff75f6d1b37dcda881 <932c0a4f77ac13e526fdd5b42914d29c9821d389; version=357603f4d396d85fbf0045512efaf1d7f7394ed7; version=505ea2b295929e7be2b4e1bc86ee31cb7862fb01 <09b0cd1297b4dbfe736aeaa0ceeab2265f47f772; version=505ea2b295929e7be2b4e1bc86ee31cb7862fb01 <9cd536970192b72257afcdfba0bfc09993e6f19c; version=505ea2b295929e7be2b4e1bc86ee31cb7862fb01 <ae76cf6c2c842944c6514c57df54d728f1916553; version=6.1.120 <6.1.159; version=6.6.51 <6.6.117; version=6.8.9 <6.9; version=6.9; version=f00f36db76eb8fd10d13e80e2590f23b5beaa54d <0a94f7e017438935c09ef833a1aa908ad9875213

Published CVSS scores

8.8LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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