diff --git a/meta/recipes-kernel/linux/cve-exclusion.inc b/meta/recipes-kernel/linux/cve-exclusion.inc
index 36643ccc..36920e2c 100644
--- a/meta/recipes-kernel/linux/cve-exclusion.inc
+++ b/meta/recipes-kernel/linux/cve-exclusion.inc
@@ -206,3 +206,11 @@ model, no upstream fix"
 # https://ubuntu.com/security/CVE-2021-3714
 CVE_STATUS[CVE-2021-3714] = "unpatched: Timing side channel inherent to Kernel \
 Same-page Merging (KSM) page deduplication"
+
+# Triaged August 2026 - Two fixes proposed upstream but neither was merged,
+# attempts to fix seem to have petered out. Unfixed in Debian/Ubuntu.
+# https://lore.kernel.org/all/20211221021744.864115-1-longman@redhat.com/
+# https://lore.kernel.org/all/20211228170910.623156-1-wander@redhat.com/
+# https://security-tracker.debian.org/tracker/CVE-2021-3864
+# https://ubuntu.com/security/CVE-2021-3864
+CVE_STATUS[CVE-2021-3864] = "unpatched: Proposed fixes were not merged upstream"