Mention the CVE number that is fixed

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/ChangeLog.d/psa-shared-memory-protection.txt b/ChangeLog.d/psa-shared-memory-protection.txt
index 765c97c..e5ee513 100644
--- a/ChangeLog.d/psa-shared-memory-protection.txt
+++ b/ChangeLog.d/psa-shared-memory-protection.txt
@@ -11,6 +11,7 @@
      MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS.
      Note that setting this option will cause input-output buffer overlap to
      be only partially supported.
+     Fixes CVE-2024-28960
 Bugfix
    * Fully support arbitrary overlap between inputs and outputs of PSA
      functions. Note that overlap is still only partially supported when