Adjacent crash via NULL QoS pointer write
Published Jun 28, 2026 · Updated Jun 28, 2026
NULL pointer dereference in Zephyr Project Zephyr RTOS 4.3.0 and later, before 4.5.0 allows physically proximate attackers to crash BAP clients. In unicast_client_ep_qos_state(), a peer-supplied QoS Configured GATT notification writes QoS fields through stream->qos although that pointer remains NULL until unicast_group_add_stream() runs. Exploitation requires an adjacent ASCS server and a codec-configured stream not yet added to a unicast group; the resulting NULL-pointer write crashes the client.
Summary
What happened
NULL pointer dereference in Zephyr Project Zephyr RTOS 4.3.0 and later, before 4.5.0 allows physically proximate attackers to crash BAP clients. In unicast_client_ep_qos_state(), a peer-supplied QoS Configured GATT notification writes QoS fields through stream->qos although that pointer remains NULL until unicast_group_add_stream() runs. Exploitation requires an adjacent ASCS server and a codec-configured stream not yet added to a unicast group; the resulting NULL-pointer write crashes the client.
The record
- CVE
- CVE-2026-10593
- Published
- Jun 28, 2026
- Updated
- Jun 28, 2026
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- CWE-476, T1499
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 28, 2026CVE publishedPublication date reported by the CVE source.
- Jun 28, 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=4.3.0 <4.5.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
Your stack
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Your stack
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