CVE-2026-43062

Bluetooth channel disruption via response type confusion

Published May 5, 2026 · Updated May 5, 2026

Type confusion in the Bluetooth L2CAP ECRED handler in Linux Kernel allows physically proximate attackers to disrupt channel state. l2cap_ecred_reconf_rsp() treats a two-byte reconfiguration response as an eight-byte connection response, rejecting valid short packets and reading the result from attacker-controlled offset 6 instead of offset 0. A nearby Bluetooth LE peer must establish an ECRED exchange; the demonstrated consequence is incorrect reconfiguration or channel teardown, not memory disclosure or a kernel crash.

CVSS severity7.1
High
EPSS probability0.21%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in the Bluetooth L2CAP ECRED handler in Linux Kernel allows physically proximate attackers to disrupt channel state. l2cap_ecred_reconf_rsp() treats a two-byte reconfiguration response as an eight-byte connection response, rejecting valid short packets and reading the result from attacker-controlled offset 6 instead of offset 0. A nearby Bluetooth LE peer must establish an ECRED exchange; the demonstrated consequence is incorrect reconfiguration or channel teardown, not memory disclosure or a kernel crash.

The record

CVE
CVE-2026-43062
Published
May 5, 2026
Updated
May 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2026CVE publishedPublication date reported by the CVE source.
  2. May 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=15f02b91056253e8cdc592888f431da0731337b8 <111f74547eee8cfedfb854284e80f35c8a491186
  2. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <15145675690cab2de1056e7ed68e59cbd0452529
  3. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <21d3ba696918d6373233aac0b9d51fcabdedddc0
  4. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <3b94e62caa1dc1198d0d55d97bd710da1dee15d7
  5. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <5a1ea296f8589ce8f1e3141b2b123b34ad010e19
  6. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <d90150c72d2e6a8a3079e88755dafcfbe91c746d
  7. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <dd3b221e21079ade8263fbb7176f3d55ad75d3b6
  8. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <f110b8f58b254bf997cec1bd60701b7798e9bb82
  9. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=15f02b91056253e8cdc592888f431da0731337b8 <111f74547eee8cfedfb854284e80f35c8a491186; version=15f02b91056253e8cdc592888f431da0731337b8 <15145675690cab2de1056e7ed68e59cbd0452529; version=15f02b91056253e8cdc592888f431da0731337b8 <21d3ba696918d6373233aac0b9d51fcabdedddc0; version=15f02b91056253e8cdc592888f431da0731337b8 <3b94e62caa1dc1198d0d55d97bd710da1dee15d7; version=15f02b91056253e8cdc592888f431da0731337b8 <5a1ea296f8589ce8f1e3141b2b123b34ad010e19; version=15f02b91056253e8cdc592888f431da0731337b8 <d90150c72d2e6a8a3079e88755dafcfbe91c746d; version=15f02b91056253e8cdc592888f431da0731337b8 <dd3b221e21079ade8263fbb7176f3d55ad75d3b6; version=15f02b91056253e8cdc592888f431da0731337b8 <f110b8f58b254bf997cec1bd60701b7798e9bb82; version=5.7

Published CVSS scores

7.1Linux kernel CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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