EUVD-2026-35353Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Lifecycle Timeline
1DescriptionCVE.org
A remote, unauthenticated BLE peer can trigger a 2-byte out-of-bounds write in the Bluetooth host during L2CAP LE CoC SDU reassembly. When the application enables segmentation (via chan_ops.alloc_buf) and the chosen RX pool has a user_data_size smaller than 2 bytes, the segmentation counter stored in the net_buf user_data area is written out of bounds in l2cap_chan_le_recv_seg (subsys/bluetooth/host/l2cap.c). The observed effects are an AddressSanitizer abort and, without ASan, heap corruption / fatal error.
AnalysisAI
Out-of-bounds write in Zephyr RTOS Bluetooth host stack allows an adjacent unauthenticated BLE peer to corrupt heap memory during L2CAP LE Credit-Based Connection SDU reassembly. The 2-byte OOB write occurs in l2cap_chan_le_recv_seg when applications enable segmentation via chan_ops.alloc_buf with an RX pool whose user_data_size is smaller than 2 bytes, producing AddressSanitizer aborts or fatal heap corruption on production builds. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires BLE radio proximity to the target (CVSS AV:A, typically within ~10-100m depending on radio class) and that the target accepts an incoming L2CAP LE CoC channel from an unauthenticated peer. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.6 vector (AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H) correctly reflects that exploitation requires only BLE radio proximity (adjacent network) with no authentication or user interaction, and that the dominant impact is availability (device crash via heap corruption) with limited confidentiality/integrity exposure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker within BLE radio range of a vulnerable Zephyr device (a wearable, smart lock, or industrial sensor) initiates an L2CAP LE Credit-Based Connection and sends a segmented SDU that drives the reassembly path through l2cap_chan_le_recv_seg. The host writes the segmentation counter past the end of an undersized net_buf user_data area, corrupting adjacent heap metadata and triggering a fatal error or device reboot - yielding a reliable, repeatable denial-of-service against the target. … |
| Remediation | Apply the upstream fix tracked in Zephyr advisory GHSA-qrcq-hxwj-mqxm (https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qrcq-hxwj-mqxm) and rebuild firmware against the patched Zephyr release branch - the input data does not specify a tagged version, so an upstream fix is available per vendor advisory but the released patched version should be confirmed against the advisory before shipping. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Zephyr RTOS deployments with Bluetooth enabled and document current firmware versions; assess Bluetooth interface exposure and threat model per deployment. …
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External POC / Exploit Code
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