Unauthenticated kernel code execution via SMB DataOffset
Published Apr 11, 2026 · Updated Apr 11, 2026
Out-of-bounds access in Sonos Era 300 firmware allows remote attackers to execute kernel code through a crafted SMB response. The SMB response handler uses the DataOffset field without confirming that the referenced data remains inside the allocated buffer. No authentication or user interaction is required, and successful exploitation grants kernel-context code execution on the speaker.
Summary
What happened
Out-of-bounds access in Sonos Era 300 firmware allows remote attackers to execute kernel code through a crafted SMB response. The SMB response handler uses the DataOffset field without confirming that the referenced data remains inside the allocated buffer. No authentication or user interaction is required, and successful exploitation grants kernel-context code execution on the speaker.
The record
- CVE
- CVE-2026-4149
- Published
- Apr 11, 2026
- Updated
- Apr 11, 2026
- Vendor
- Sonos
- Product
- Era 300
- Classifications
- CWE-119, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 11, 2026CVE publishedPublication date reported by the CVE source.
- Apr 11, 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.
- Affected versionversion=17.5 (build 91.0-70070)
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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