CVE-2026-10660

Memory corruption via shared BLE reassembly buffer

Published Jul 11, 2026 · Updated Jul 11, 2026

Out-of-bounds write in Zephyr RTOS 3.6.0 through 4.4.0 allows physically proximate attackers to corrupt memory over BLE. The notify_handler function appends Broadcast Receive State notifications from multiple connections to one 512-byte file-static buffer without checking tailroom. Exploitation requires concurrent Scan Delegator connections and a sufficiently large ATT MTU, causing cross-connection data corruption, a crash, or memory corruption.

CVSS severity6.4
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Zephyr RTOS 3.6.0 through 4.4.0 allows physically proximate attackers to corrupt memory over BLE. The notify_handler function appends Broadcast Receive State notifications from multiple connections to one 512-byte file-static buffer without checking tailroom. Exploitation requires concurrent Scan Delegator connections and a sufficiently large ATT MTU, causing cross-connection data corruption, a crash, or memory corruption.

The record

CVE
CVE-2026-10660
Published
Jul 11, 2026
Updated
Jul 11, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-787, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 11, 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=3.6.0 <4.5.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=3.6.0 <4.5.0

Published CVSS scores

6.4Zephyr ProjectCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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