{"id":"CVE-2026-45681","state":"PUBLISHED","title":"OpenTelemetry eBPF Instrumentation: CPU-mismatch fallback uses 256-byte buffer with 8KB size","description":"OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. Prior to version 0.9.0, the per-CPU message-buffer fallback path uses a 256-byte backup buffer but preserves the original payload size, which can be up to 8KB. If a CPU mismatch occurs, OBI can read beyond the fallback buffer and leak adjacent memory into telemetry. This issue has been patched in version 0.9.0.","publishedAt":"2026-06-02T15:25:00.260Z","updatedAt":"2026-06-02T18:05:14.202Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["open-telemetry opentelemetry-ebpf-instrumentation"],"affected":[{"vendor":"open-telemetry","product":"opentelemetry-ebpf-instrumentation","versions":[{"version":"< 0.9.0","status":"affected"}]}],"references":["https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-r6c9-g6q5-qrf9","https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/releases/tag/v0.9.0"],"weaknesses":["CWE-125","CWE-130"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45681.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45681","state":"PUBLISHED","datePublished":"2026-06-02T15:25:00.260Z","dateUpdated":"2026-06-02T18:05:14.202Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-12T21:59:25.667Z"},"containers":{"cna":{"title":"OpenTelemetry eBPF Instrumentation: CPU-mismatch fallback uses 256-byte buffer with 8KB size","descriptions":[{"lang":"en","value":"OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. Prior to version 0.9.0, the per-CPU message-buffer fallback path uses a 256-byte backup buffer but preserves the original payload size, which can be up to 8KB. If a CPU mismatch occurs, OBI can read beyond the fallback buffer and leak adjacent memory into telemetry. This issue has been patched in version 0.9.0."}],"affected":[{"vendor":"open-telemetry","product":"opentelemetry-ebpf-instrumentation","versions":[{"version":"< 0.9.0","status":"affected"}]}],"references":[{"url":"https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-r6c9-g6q5-qrf9","name":"https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-r6c9-g6q5-qrf9","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/releases/tag/v0.9.0","name":"https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/releases/tag/v0.9.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125: Out-of-bounds Read","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-130","lang":"en","description":"CWE-130: Improper Handling of Length Parameter Inconsistency","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-02T15:25:00.260Z"},"source":{"advisory":"GHSA-r6c9-g6q5-qrf9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-r6c9-g6q5-qrf9","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-02T18:05:10.631730Z","id":"CVE-2026-45681","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-02T18:05:14.202Z"}}]}}}