CVE-2026-15892Network attack vector

Denial of service via rejected-request heap leak

Published Sep 13, 2026 · Updated Sep 13, 2026

Heap exhaustion in Zephyr RTOS 3.5.0 through 4.4.1 allows remote attackers to interrupt device services via rejected SMP settings requests. The settings_mgmt_read(), settings_mgmt_write(), and settings_mgmt_delete() handlers return directly after access-hook rejection, bypassing cleanup of heap-allocated request buffers. Exploitation requires reachable SMP, heap-backed settings buffers, the access hook, and MGMT_CB_ERROR_RC rejection; repeated requests exhaust memory until reboot without corruption or disclosure.

CVSS severityUnavailable
Unscored
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

Heap exhaustion in Zephyr RTOS 3.5.0 through 4.4.1 allows remote attackers to interrupt device services via rejected SMP settings requests. The settings_mgmt_read(), settings_mgmt_write(), and settings_mgmt_delete() handlers return directly after access-hook rejection, bypassing cleanup of heap-allocated request buffers. Exploitation requires reachable SMP, heap-backed settings buffers, the access hook, and MGMT_CB_ERROR_RC rejection; repeated requests exhaust memory until reboot without corruption or disclosure.

The record

CVE
CVE-2026-15892
Published
Sep 13, 2026
Updated
Sep 13, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 13, 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=3.5.0 <4.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=3.5.0 <4.4.2

Published CVSS scores

No CVSS assessment is available in this record.

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)
Vectornetwork
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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