CVE-2026-45683 OpenTelemetry eBPF Instrumentation: Java TLS ioctl kprobe allows kernel memory disclosure
A local attacker can exploit a Java TLS ioctl probe to read kernel memory into telemetry data, requiring an upgrade to OpenTelemetry eBPF Instrumentation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45683?
CVE-2026-45683 is a low-severity vulnerability in open-telemetry opentelemetry-ebpf-instrumentation, published on 2 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. Prior to version 0.9.0, the Java TLS ioctl probe reads user-controlled ioctl pointers with bpf_probe_read instead of bpf_probe_read_user. An instrumented local process can therefore point OBI at kernel memory and cause that memory to be copied into telemetry. This issue has been patched in version 0.9.0.
Which versions are affected by CVE-2026-45683?
3 open source packages ship an affected version, including go.opentelemetry.io/obi. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
go.opentelemetry.io/obi Go | All versions | 0.9.0 |
go.opentelemetry.io/obi Go | All versions | 0.9.0 |
go.opentelemetry.io/obi Go | All versions | 0.9.0 |
Products include Opentelemetry Ebpf Instrumentation.
How do I fix CVE-2026-45683?
Upgrade go.opentelemetry.io/obi to 0.9.0 or later.
Is CVE-2026-45683 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45683 exists.
Other vulnerabilities in open-telemetry opentelemetry-ebpf-instrumentation
- CVE-2026-45678 OpenTelemetry eBPF Instrumentation: Postgres BIND parsing can panic on malformed payloads
- CVE-2026-45685 OpenTelemetry eBPF Instrumentation: MongoDB parser panics on malformed wire messages
- CVE-2026-45686 OpenTelemetry eBPF Instrumentation: Memcached payload length overflow can crash OBI
- CVE-2026-45679 OpenTelemetry eBPF Instrumentation: Redis error text is exported in span status messages
- CVE-2026-45680 OpenTelemetry eBPF Instrumentation: Unbounded BPF internal metrics replay can exhaust CPU
Sources
Also known as GHSA-fjq3-ffvr-vm46, GO-2026-5366.