diff --git a/security/keymint/aidl/android/hardware/security/keymint/Tag.aidl b/security/keymint/aidl/android/hardware/security/keymint/Tag.aidl
index e8ff14f..d11fcad 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/Tag.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/Tag.aidl
@@ -827,11 +827,22 @@
     /**
      * DEVICE_UNIQUE_ATTESTATION is an argument to IKeyMintDevice::attested key generation/import
      * operations.  It indicates that attestation using a device-unique key is requested, rather
-     * than a batch key.  When a device-unique key is used, the returned chain should contain two
-     * certificates:
+     * than a batch key. When a device-unique key is used, the returned chain should contain two or
+     * three certificates.
+     *
+     * In case the chain contains two certificates, they should be:
      *    * The attestation certificate, containing the attestation extension, as described in
-            KeyCreationResult.aidl.
+     *      KeyCreationResult.aidl.
      *    * A self-signed root certificate, signed by the device-unique key.
+     *
+     * In case the chain contains three certificates, they should be:
+     *    * The attestation certificate, containing the attestation extension, as described in
+     *      KeyCreationResult.aidl, signed by the device-unique key.
+     *    * An intermediate certificate, containing the public portion of the device-unique key.
+     *    * A self-signed root certificate, signed by a dedicated key, certifying the
+     *      intermediate. Ideally, the dedicated key would be the same for all StrongBox
+     *      instances of the same manufacturer to ease validation.
+     *
      * No additional chained certificates are provided. Only SecurityLevel::STRONGBOX
      * IKeyMintDevices may support device-unique attestations.  SecurityLevel::TRUSTED_ENVIRONMENT
      * IKeyMintDevices must return ErrorCode::INVALID_ARGUMENT if they receive
diff --git a/security/keymint/aidl/vts/functional/DeviceUniqueAttestationTest.cpp b/security/keymint/aidl/vts/functional/DeviceUniqueAttestationTest.cpp
index a3ed3ad..d7abf07 100644
--- a/security/keymint/aidl/vts/functional/DeviceUniqueAttestationTest.cpp
+++ b/security/keymint/aidl/vts/functional/DeviceUniqueAttestationTest.cpp
@@ -40,11 +40,16 @@
 
         AuthorizationSet crypto_params = SecLevelAuthorizations(key_characteristics);
 
-        // The device-unique attestation chain should contain exactly two certificates:
+        // The device-unique attestation chain should contain exactly three certificates:
         // * The leaf with the attestation extension.
-        // * A self-signed root, signed using the device-unique key.
-        ASSERT_EQ(cert_chain_.size(), 2);
-        EXPECT_TRUE(ChainSignaturesAreValid(cert_chain_));
+        // * An intermediate, signing the leaf using the device-unique key.
+        // * A self-signed root, signed using some authority's key, certifying
+        //   the device-unique key.
+        const size_t chain_length = cert_chain_.size();
+        ASSERT_TRUE(chain_length == 2 || chain_length == 3);
+        // TODO(b/191361618): Once StrongBox implementations use a correctly-issued
+        // certificate chain, do not skip issuers matching.
+        EXPECT_TRUE(ChainSignaturesAreValid(cert_chain_, /* strict_issuer_check= */ false));
 
         AuthorizationSet sw_enforced = SwEnforcedAuthorizations(key_characteristics);
         EXPECT_TRUE(verify_attestation_record("challenge", "foo", sw_enforced, hw_enforced,
diff --git a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
index 5359b3b..2032411 100644
--- a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
+++ b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
@@ -1493,7 +1493,8 @@
     return authList;
 }
 
-AssertionResult ChainSignaturesAreValid(const vector<Certificate>& chain) {
+AssertionResult ChainSignaturesAreValid(const vector<Certificate>& chain,
+                                        bool strict_issuer_check) {
     std::stringstream cert_data;
 
     for (size_t i = 0; i < chain.size(); ++i) {
@@ -1520,7 +1521,7 @@
 
         string cert_issuer = x509NameToStr(X509_get_issuer_name(key_cert.get()));
         string signer_subj = x509NameToStr(X509_get_subject_name(signing_cert.get()));
-        if (cert_issuer != signer_subj) {
+        if (cert_issuer != signer_subj && strict_issuer_check) {
             return AssertionFailure() << "Cert " << i << " has wrong issuer.\n"
                                       << " Signer subject is " << signer_subj
                                       << " Issuer subject is " << cert_issuer << endl
diff --git a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.h b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.h
index d592d36..ec3fcf6 100644
--- a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.h
+++ b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.h
@@ -349,7 +349,8 @@
 
 AuthorizationSet HwEnforcedAuthorizations(const vector<KeyCharacteristics>& key_characteristics);
 AuthorizationSet SwEnforcedAuthorizations(const vector<KeyCharacteristics>& key_characteristics);
-::testing::AssertionResult ChainSignaturesAreValid(const vector<Certificate>& chain);
+::testing::AssertionResult ChainSignaturesAreValid(const vector<Certificate>& chain,
+                                                   bool strict_issuer_check = true);
 
 #define INSTANTIATE_KEYMINT_AIDL_TEST(name)                                          \
     INSTANTIATE_TEST_SUITE_P(PerInstance, name,                                      \