Add changelog entry: fix #3394
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/montmul-cmp-branch.txt b/ChangeLog.d/montmul-cmp-branch.txt
new file mode 100644
index 0000000..5994518
--- /dev/null
+++ b/ChangeLog.d/montmul-cmp-branch.txt
@@ -0,0 +1,6 @@
+Security
+ * Fix a side channel vulnerability in modular exponentiation that could
+ reveal an RSA private key used in a secure enclave. Noticed by Sangho Lee,
+ Ming-Wei Shih, Prasun Gera, Taesoo Kim and Hyesoon Kim (Georgia Institute
+ of Technology); and Marcus Peinado (Microsoft Research). Reported by Raoul
+ Strackx (Fortanix) in #3394.