CVE-2026-10648

Device crash via reset of NULL packet buffer

Published Jun 29, 2026 · Updated Jun 29, 2026

NULL-pointer dereference in Zephyr RTOS 4.4.0 allows local users to crash devices through crafted MCUmgr serial traffic. mcumgr_serial_process_frag() resets the result of nonblocking smp_packet_alloc() before checking for NULL after the four-entry packet pool is exhausted. Repeated new packets over enabled UART, raw-UART, or shell-console transports exhaust the shared pool and trigger a device fault, with no reported confidentiality or integrity impact.

CVSS severity6.2
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in Zephyr RTOS 4.4.0 allows local users to crash devices through crafted MCUmgr serial traffic. mcumgr_serial_process_frag() resets the result of nonblocking smp_packet_alloc() before checking for NULL after the four-entry packet pool is exhausted. Repeated new packets over enabled UART, raw-UART, or shell-console transports exhaust the shared pool and trigger a device fault, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2026-10648
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-476, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 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=4.4.0 <4.5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=4.4.0 <4.5.0

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.2Zephyr ProjectCVSS:3.1/AV:L/AC:L/PR:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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