CVE-2026-43019

Local kernel memory corruption via unlocked hci_conn access

Published May 1, 2026 · Updated May 1, 2026

Use-after-free in the Bluetooth hci_conn code in Linux Kernel allows local users to read, modify, or corrupt kernel memory. The set_cig_params_sync function looks up an hci_conn and reads its configuration under only an RCU lock, allowing concurrent deletion or modification because the hdev lock is absent. Exploitation requires low-privileged local access and a race during Bluetooth LE isochronous CIG configuration, resulting in kernel memory compromise or a system crash.

CVSS severity7.8
High
EPSS probability0.13%
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 the Bluetooth hci_conn code in Linux Kernel allows local users to read, modify, or corrupt kernel memory. The set_cig_params_sync function looks up an hci_conn and reads its configuration under only an RCU lock, allowing concurrent deletion or modification because the hdev lock is absent. Exploitation requires low-privileged local access and a race during Bluetooth LE isochronous CIG configuration, resulting in kernel memory compromise or a system crash.

The record

CVE
CVE-2026-43019
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=3a273cd0f47dd672d37736e623849374f9ab9ce9
  2. Affected versionversion=6.6
  3. Affected versionversion=a091289218202bc09d9b9caa8afcde1018584aec <66d432e9b45bae7881ffcdb12cd8fd0bf254ef02
  4. Affected versionversion=a091289218202bc09d9b9caa8afcde1018584aec <7d568fede8eac91161a60b710aa920abe9b0fb9f
  5. Affected versionversion=a091289218202bc09d9b9caa8afcde1018584aec <a2639a7f0f5bf7d73f337f8f077c19415c62ed2c
  6. Affected versionversion=a091289218202bc09d9b9caa8afcde1018584aec <bad65b4b0a96139f023eadc28a33125963208449
  7. Affected versionversion=d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3a273cd0f47dd672d37736e623849374f9ab9ce9; version=6.6; version=a091289218202bc09d9b9caa8afcde1018584aec <66d432e9b45bae7881ffcdb12cd8fd0bf254ef02; version=a091289218202bc09d9b9caa8afcde1018584aec <7d568fede8eac91161a60b710aa920abe9b0fb9f; version=a091289218202bc09d9b9caa8afcde1018584aec <a2639a7f0f5bf7d73f337f8f077c19415c62ed2c; version=a091289218202bc09d9b9caa8afcde1018584aec <bad65b4b0a96139f023eadc28a33125963208449; version=d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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