CVE-2026-11742

Local heap disclosure and crash via queue race

Published Aug 7, 2026 · Updated Aug 7, 2026

Use-after-free in Zephyr RTOS 1.12.0 through 4.4.1 allows local users to read stale heap data or crash the device via a queue race. The k_queue_peek_head and k_queue_peek_tail implementations call z_queue_node_peek without the queue spinlock, allowing concurrent k_queue_get to free an alloc_node before its flag and data pointer are read. Exploitation requires low-privileged local access to a shared queue and winning a narrow race under SMP, preemption, or ISR concurrency; consequences include a one-pointer disclosure, dangling-pointer consumption, memory corruption, or a crash.

CVSS severityUnavailable
Unscored
EPSS probability0.09%
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 1.12.0 through 4.4.1 allows local users to read stale heap data or crash the device via a queue race. The k_queue_peek_head and k_queue_peek_tail implementations call z_queue_node_peek without the queue spinlock, allowing concurrent k_queue_get to free an alloc_node before its flag and data pointer are read. Exploitation requires low-privileged local access to a shared queue and winning a narrow race under SMP, preemption, or ISR concurrency; consequences include a one-pointer disclosure, dangling-pointer consumption, memory corruption, or a crash.

The record

CVE
CVE-2026-11742
Published
Aug 7, 2026
Updated
Aug 7, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 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=1.12.0 <4.4.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=1.12.0 <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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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