CVE-2026-11812

Firmware-update interruption via unsynchronized shared context

Published Aug 10, 2026 · Updated Aug 10, 2026

Race condition in UpdateHub in Zephyr RTOS 2.0.0 through 4.4.1 allows local users to interrupt firmware updates via concurrent operations. The subsystem shares one file-scope context without locking, so concurrent flows can make prepare_fds write past fds[1] into adjacent socket state. Triggering requires permission to invoke an update operation and winning a race against the background handler; the demonstrated consequence is update-path state corruption and denial of service.

CVSS severity2.5
Low
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in UpdateHub in Zephyr RTOS 2.0.0 through 4.4.1 allows local users to interrupt firmware updates via concurrent operations. The subsystem shares one file-scope context without locking, so concurrent flows can make prepare_fds write past fds[1] into adjacent socket state. Triggering requires permission to invoke an update operation and winning a race against the background handler; the demonstrated consequence is update-path state corruption and denial of service.

The record

CVE
CVE-2026-11812
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=2.0.0 <=4.4.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=2.0.0 <=4.4.1

Published CVSS scores

2.5Zephyr ProjectCVSS:3.1/AV:L/AC:H/PR:L/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.

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

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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