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Remotely triggerable NULL-pointer dereference in Bluetooth LE Audio BAP unicast client QoS-state handling

Type: advisorySource: Official CVE List1 source record

The Zephyr Bluetooth LE Audio Basic Audio Profile (BAP) unicast client mishandles peer-supplied ASE state notifications. In unicast_client_ep_qos_state() (subsys/bluetooth/audio/bap_unicast_client.c), the handler writes attacker-controlled QoS fields (interval, framing, phy, sdu, rtn, latency, pd) through the stream->qos pointer with only a stream != NULL guard. stream->qos is NULL for any stream that has been codec-configured via bt_bap_stream_config() but not yet added to a unicast group (it is set only by unicast_group_add_stream()). A malicious or buggy remote ASCS server, to which the local device is connected as a BAP unicast client, can send a GATT notification announcing the ASE has entered the QoS Configured state while the local endpoint is still in the Codec Configured state — a transition the dispatcher explicitly permits — during that window, causing a write through a NULL pointer and a crash (denial of service). The data written is itself remote-controlled. The defect shipped in v4.3.0 and v4.4.0 (and earlier). The fix re-points all BAP QoS storage to the always-valid embedded ep->qos struct, eliminating the NULL dereference.

Announced Source revision 1
Original source ↗

CVE-2026-10593

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-10593

zephyr

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "zephyrproject",
    "product": "zephyr",
    "versions": [
      {
        "status": "affected",
        "version": "4.3.0",
        "lessThan": "4.3.1",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "4.4.0",
        "lessThan": "4.4.2",
        "versionType": "semver"
      }
    ],
    "packageName": "zephyr",
    "programFiles": [
      "include/zephyr/bluetooth/audio/bap.h",
      "subsys/bluetooth/audio/ascs.c",
      "subsys/bluetooth/audio/bap_broadcast_sink.c",
      "subsys/bluetooth/audio/bap_broadcast_source.c",
      "subsys/bluetooth/audio/bap_endpoint.h",
      "subsys/bluetooth/audio/bap_stream.c",
      "subsys/bluetooth/audio/bap_unicast_client.c",
      "subsys/bluetooth/audio/bap_unicast_client_internal.h"
    ],
    "collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-10593

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#30743 · Revision 1
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Publisher date
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