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PatchSiren cyber security CVE debrief

CVE-2026-5068 zephyrproject-rtos CVE debrief

CVE-2026-5068 is a HIGH severity vulnerability with a CVSS score of 7.6. A remote, unauthenticated BLE peer can trigger a 2-byte out-of-bounds write in the Bluetooth host during L2CAP LE CoC SDU reassembly. This occurs when the application enables segmentation and the chosen RX pool has a user_data_size smaller than 2 bytes. The observed effects are an AddressSanitizer abort and, without ASan, heap corruption / fatal error.

Vendor
zephyrproject-rtos
Product
Zephyr
CVSS
HIGH 7.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-08
Advisory published
2026-06-09
Advisory updated
2026-07-08

Who should care

Users of Bluetooth host applications that enable segmentation and have a chosen RX pool with a user_data_size smaller than 2 bytes should be aware of this vulnerability.

Technical summary

The vulnerability is caused by an out-of-bounds write in the l2cap_chan_le_recv_seg function (subsys/bluetooth/host/l2cap.c).

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches or updates from the vendor as soon as they are available.
  • Review and update application configurations to prevent exploitation.

Evidence notes

The CVE was published on 2026-06-09T08:16:29.073Z and modified on 2026-06-09T13:53:24.200Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-5068 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-5068

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-5068 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-5068

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.