Executive brief
OpenTelemetry eBPF Instrumentation is a tool used to monitor application performance and network traffic at a deep system level. A security flaw in its Java TLS monitoring component allows a local user or process to trick the tool into reading sensitive data from the operating system's kernel memory. This could result in the accidental exposure of private system information through the tool's normal monitoring reports (telemetry).
Technical details
A vulnerability exists in the Java TLS ioctl kprobe within OpenTelemetry eBPF Instrumentation (OBI) prior to version 0.9.0. The probe, located in 'bpf/generictracer/java_tls.c', incorrectly uses 'bpf_probe_read' instead of 'bpf_probe_read_user' when processing user-controlled ioctl pointers. Because the third argument of the ioctl is treated as a structured buffer without proper memory space validation, a local instrumented process can supply a kernel-space pointer. This allows an attacker to bypass security boundaries and cause the BPF program to copy kernel memory into the telemetry ring buffer, leading to information disclosure. The issue is patched in version 0.9.0.
Affected products
- OpenTelemetry OpenTelemetry eBPF Instrumentation (OBI) Prior to 0.9.0
Timeline
- 2026-05-11: patched: Version 0.9.0 released
- 2026-05-12: advisory: GitHub Security Advisory GHSA-fjq3-ffvr-vm46 published
- 2026-06-02: disclosed: CVE-2026-45683 published to NVD