Memory corruption via L2CAP command-length underflow
Published Jul 21, 2026 · Updated Jul 21, 2026
Out-of-bounds access in Zephyr RTOS 4.2.0 through 4.3.0 and 4.4.0 through 4.4.1 allows physically proximate attackers to corrupt memory. The BR/EDR configuration handlers compare a command's minimum size with the remaining pooled PDU buffer instead of its declared length, allowing trailing bytes to underflow a 16-bit option length and drive the parser beyond the buffer. Exploitation requires Classic Bluetooth L2CAP support, an ACL connection, and a valid local destination channel; it allows out-of-bounds reads and writes, channel-state corruption, or a device crash without pairing.
Summary
What happened
Out-of-bounds access in Zephyr RTOS 4.2.0 through 4.3.0 and 4.4.0 through 4.4.1 allows physically proximate attackers to corrupt memory. The BR/EDR configuration handlers compare a command's minimum size with the remaining pooled PDU buffer instead of its declared length, allowing trailing bytes to underflow a 16-bit option length and drive the parser beyond the buffer. Exploitation requires Classic Bluetooth L2CAP support, an ACL connection, and a valid local destination channel; it allows out-of-bounds reads and writes, channel-state corruption, or a device crash without pairing.
The record
- CVE
- CVE-2026-10680
- Published
- Jul 21, 2026
- Updated
- Jul 21, 2026
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- CWE-125, T1210
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 21, 2026CVE publishedPublication date reported by the CVE source.
- Jul 21, 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=4.2.0 <4.3.1
- Affected versionversion=4.4.0 <=4.4.1
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.
Public exploit references
- GHSA-vrwx-p97q-8854 proof-of-concept procedureproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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