Memory disclosure via oversized connection request
Published Aug 13, 2026 · Updated Aug 13, 2026
Buffer over-read in Silicon Labs BT122 1.4.0 and earlier allows physically proximate attackers to disclose memory via a malformed BLE request. The Bluetooth stack accepts a connection request whose Data Length field extends the packet to 247 bytes and allocates memory beyond the expected L2CAP data. Exploitation requires direct Bluetooth radio reachability but no pairing or secret keys; the reported consequences are memory leakage and device fingerprinting.
Summary
What happened
Buffer over-read in Silicon Labs BT122 1.4.0 and earlier allows physically proximate attackers to disclose memory via a malformed BLE request. The Bluetooth stack accepts a connection request whose Data Length field extends the packet to 247 bytes and allocates memory beyond the expected L2CAP data. Exploitation requires direct Bluetooth radio reachability but no pairing or secret keys; the reported consequences are memory leakage and device fingerprinting.
The record
- CVE
- CVE-2026-65933
- Published
- Aug 13, 2026
- Updated
- Aug 13, 2026
- Vendor
- Sigma Designs
- Product
- BT122
- Classifications
- CWE-126
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 13, 2026CVE publishedPublication date reported by the CVE source.
- Aug 13, 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?
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- Affected versionversion=0 <=1.4.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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