Bluetooth Classic SDP parser truncation bug in bt_sdp_parse_attribute() leads to reachable assertion and possible out-of-bounds read

A malformed Bluetooth Classic SDP attribute can trigger a reachable assertion in Zephyr's SDP parser. In subsys/bluetooth/host/classic/sdp.c, bt_sdp_parse_attribute() accepts an input buffer once it contains the 1-byte attribute type and 2-byte attribute id, but then unconditionally pulls an additional byte for the value type without verifying that the byte is present. A truncated 3-byte attribute (for example 09 00 09) therefore reaches net_buf_simple_pull() with insufficient remaining length, triggering the __ASSERT_NO_MSG(buf->len >= len) check and a kernel panic in assert-enabled builds (denial of service). In builds where assertions are disabled, parsing may continue past the end of the available buffer, leading to an out-of-bounds read and undefined behavior.

Problem type

Affected products

zephyrproject-rtos

Zephyr

<= 4.4.0 - AFFECTED

References

github.com

https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p93g-3r68-cj53

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-10651

Click to expand

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    "assignerShortName": "zephyr",
    "dateUpdated": "2026-06-22T23:54:36.070Z",
    "dateReserved": "2026-06-02T15:24:24.388Z",
    "datePublished": "2026-06-22T23:54:36.070Z",
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