CVE-2026-10639Network attack vector

Remote crash via post-send packet interface access

Published Jun 16, 2026 · Updated Jun 16, 2026

Use-after-free in Zephyr RTOS 1.14.0 through 4.4.0 allows remote attackers to corrupt statistics or crash devices via ICMPv4 echo requests. The handler transfers ownership of the echo-reply packet to net_try_send_data(), then reads net_pkt_iface(reply) after the TX path can free and recycle it. CONFIG_NET_STATISTICS_ICMP must be enabled; an unauthenticated ping can race packet reuse, corrupt per-interface statistics, or crash the device.

CVSS severity4.8
Medium
EPSS probability0.23%
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 Zephyr RTOS 1.14.0 through 4.4.0 allows remote attackers to corrupt statistics or crash devices via ICMPv4 echo requests. The handler transfers ownership of the echo-reply packet to net_try_send_data(), then reads net_pkt_iface(reply) after the TX path can free and recycle it. CONFIG_NET_STATISTICS_ICMP must be enabled; an unauthenticated ping can race packet reuse, corrupt per-interface statistics, or crash the device.

The record

CVE
CVE-2026-10639
Published
Jun 16, 2026
Updated
Jun 16, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 16, 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=1.14.0 <4.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=1.14.0 <4.5.0

Published CVSS scores

4.8Zephyr ProjectCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

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

CWE-416Use After Free
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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