CVE-2026-64405

Kernel crash via stale Bluetooth command state

Published Jul 25, 2026 · Updated Jul 25, 2026

NULL-pointer dereference in Linux Kernel Bluetooth connection handling allows attackers to crash the kernel during connection cancellation. hci_abort_conn() passes hdev->sent_cmd to hci_skb_event() while req_status remains HCI_REQ_PEND even though sent_cmd can be NULL, causing a general protection fault in hci_rx_work(). Triggering the crash requires a pending Bluetooth connection to enter this inconsistent command state; the reported consequence is a kernel service interruption.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in Linux Kernel Bluetooth connection handling allows attackers to crash the kernel during connection cancellation. hci_abort_conn() passes hdev->sent_cmd to hci_skb_event() while req_status remains HCI_REQ_PEND even though sent_cmd can be NULL, causing a general protection fault in hci_rx_work(). Triggering the crash requires a pending Bluetooth connection to enter this inconsistent command state; the reported consequence is a kernel service interruption.

The record

CVE
CVE-2026-64405
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=4ab81f16c68a602b2b69e333ae08d8748a9398de
  2. Affected versionversion=6083089ab00631617f9eac678df3ab050a9d837a <903227b6168bb99fd57d4e3c9c1b5014986198e0
  3. Affected versionversion=6.1.83 <6.1.118
  4. Affected versionversion=6.4.16 <6.5
  5. Affected versionversion=6.5.3 <6.6
  6. Affected versionversion=6.6
  7. Affected versionversion=a13f316e90fdb1fb6df6582e845aa9b3270f3581 <12917f591cea1af36087dba5b9ec888652f0b42a
  8. Affected versionversion=a13f316e90fdb1fb6df6582e845aa9b3270f3581 <61701912c58a05f6a043f097cc177a964abef348
  9. Affected versionversion=a13f316e90fdb1fb6df6582e845aa9b3270f3581 <70c397b62ee015e19b3924d9da741c8dda017819
  10. Affected versionversion=a13f316e90fdb1fb6df6582e845aa9b3270f3581 <83b22d7f7c384564fa42c3cf19bec715c693d7a2
  11. Affected versionversion=a13f316e90fdb1fb6df6582e845aa9b3270f3581 <b42cb640a0493d16b61ddd267420274be15efdc1
  12. Affected versionversion=e4511a67fcdba9729d1c7cfc6d2e645c765ce801

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4ab81f16c68a602b2b69e333ae08d8748a9398de; version=6083089ab00631617f9eac678df3ab050a9d837a <903227b6168bb99fd57d4e3c9c1b5014986198e0; version=6.1.83 <6.1.118; version=6.4.16 <6.5; version=6.5.3 <6.6; version=6.6; version=a13f316e90fdb1fb6df6582e845aa9b3270f3581 <12917f591cea1af36087dba5b9ec888652f0b42a; version=a13f316e90fdb1fb6df6582e845aa9b3270f3581 <61701912c58a05f6a043f097cc177a964abef348; version=a13f316e90fdb1fb6df6582e845aa9b3270f3581 <70c397b62ee015e19b3924d9da741c8dda017819; version=a13f316e90fdb1fb6df6582e845aa9b3270f3581 <83b22d7f7c384564fa42c3cf19bec715c693d7a2; version=a13f316e90fdb1fb6df6582e845aa9b3270f3581 <b42cb640a0493d16b61ddd267420274be15efdc1; version=e4511a67fcdba9729d1c7cfc6d2e645c765ce801

Published CVSS scores

5.5Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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