CVE-2026-10634

Device crash via unlocked TCP list iteration

Published Jun 15, 2026 · Updated Jun 15, 2026

Use-after-free in Zephyr Project Zephyr RTOS 2.5.0 through 4.4.0 allows attackers to crash devices during concurrent TCP teardown. net_tcp_foreach() drops tcp_lock around its callback, allowing tcp_conn_release() to free the iterator's cached next slab node before it is dereferenced. Reachability requires list iteration through the network shell or interface shutdown while ordinary peer traffic releases a connection; reused slab memory can also expose data or trigger another fault.

CVSS severity4.8
Medium
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

Use-after-free in Zephyr Project Zephyr RTOS 2.5.0 through 4.4.0 allows attackers to crash devices during concurrent TCP teardown. net_tcp_foreach() drops tcp_lock around its callback, allowing tcp_conn_release() to free the iterator's cached next slab node before it is dereferenced. Reachability requires list iteration through the network shell or interface shutdown while ordinary peer traffic releases a connection; reused slab memory can also expose data or trigger another fault.

The record

CVE
CVE-2026-10634
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-416, T1499
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 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=2.5.0 <4.5.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=2.5.0 <4.5.0

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
4.8Zephyr ProjectCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:N/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
Privilegesauthenticated
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.

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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