Adds BSOD known issue to 8.18.3 RNs (#6928) (#6932)

* Adds BSOD known issue to 8.18.3 RNs

* Adds title

* Update docs/release-notes/8.18.asciidoc

(cherry picked from commit c54de60)

Co-authored-by: natasha-moore-elastic <[email protected]>

Author: mergify[bot]

docs/release-notes/8.18.asciidoc

@@ -5,6 +5,30 @@
 [[release-notes-8.18.3]]
 === 8.18.3
 
+[discrete]
+[[known-issue-8.18.3]]
+==== Known issues
+
+// tag::known-issue[]
+[discrete]
+.{elastic-defend}'s network driver may lead to bug checks
+[%collapsible]
+====
+*Details* +
+On July 8, 2025, a known issue was discovered in {elastic-defend}'s network driver that may lead to kernel pool corruption, resulting in bug checks (BSODs) on Windows systems with a large number of long-lived network connections that remain inactive for 30+ minutes.
+
+The system may bug check with any of a variety of codes such as `SYSTEM_SERVICE_EXCEPTION` or `PAGE_FAULT_IN_NONPAGED_AREA`.
+
+For more information, check https://github.com/elastic/endpoint/issues/90[#90]
+
+*Workaround* +
+Upgrade to the fixed version: https://www.elastic.co/downloads/past-releases/elastic-agent-8-18-3+build202507101319[8.18.3+build202507101319].
+
+If you're unable to upgrade or downgrade, set the `advanced.kernel.network` advanced setting to `false` in your {elastic-defend} integration policy.
+====
+// end::known-issue[]
+
+
 [discrete]
 [[enhancements-8.18.3]]
 ==== Enhancements