CVE-2026-10636Network attack vector

Device crash via post-send packet dereference

Published Jun 16, 2026 · Updated Jun 16, 2026

Use-after-free in Zephyr RTOS 2.6.0 through 4.4.0 allows remote attackers to crash devices via crafted IPv4 IGMP queries. igmp_send() calls net_pkt_iface(pkt) after net_send_data() can release the packet's last reference, so it reads freed slab memory and can write through a dangling interface pointer when per-interface statistics are enabled. The unauthenticated path requires IPv4 IGMP handling; ordinary queries can trigger a sporadic crash or statistics corruption, while a controllable write also requires asynchronous transmission and concurrent slab reuse.

CVSS severity3.7
Low
EPSS probability0.31%
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 2.6.0 through 4.4.0 allows remote attackers to crash devices via crafted IPv4 IGMP queries. igmp_send() calls net_pkt_iface(pkt) after net_send_data() can release the packet's last reference, so it reads freed slab memory and can write through a dangling interface pointer when per-interface statistics are enabled. The unauthenticated path requires IPv4 IGMP handling; ordinary queries can trigger a sporadic crash or statistics corruption, while a controllable write also requires asynchronous transmission and concurrent slab reuse.

The record

CVE
CVE-2026-10636
Published
Jun 16, 2026
Updated
Jun 16, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-416, T1499
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=2.6.0 <4.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=2.6.0 <4.5.0

Published CVSS scores

3.7Zephyr ProjectCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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
T1499Endpoint Denial of Service

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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