diff --git a/core/libs/prx/libSceAgcDriver/tests/Graphics.cpp b/core/libs/prx/libSceAgcDriver/tests/Graphics.cpp
index 2603c7fb2c..e9ca57674b 100644
--- a/core/libs/prx/libSceAgcDriver/tests/Graphics.cpp
+++ b/core/libs/prx/libSceAgcDriver/tests/Graphics.cpp
@@ -3,11 +3,13 @@
 #include "BdaTests.hpp"
 #include "GraphicsTests.hpp"
 #include "prx/libSceAgcDriver/Execution/include/GuestMemory.hpp"
+#include "prx/libSceAgcDriver/Execution/include/Driver/Memory/DrawWriteRanges.hpp"
 #include "prx/libSceAgcDriver/Graphics/include/Recorder.hpp"
 #include "prx/libSceAgcDriver/Graphics/include/Resources.hpp"
 #include "prx/libSceAgcDriver/Graphics/include/Pipeline.hpp"
 #include "prx/libSceAgcDriver/Graphics/include/PipelineJournal.hpp"
 #include "prx/libSceAgcDriver/Graphics/include/TextureDetiler.hpp"
+#include "prx/libSceAgcDriver/Graphics/include/TextureCache.hpp"
 #include "prx/libSceAgcDriver/Graphics/include/VertexInput.hpp"
 #include "prx/libSceAgcDriver/Graphics/include/Draw.hpp"
 #include "prx/libSceAgcDriver/Graphics/include/BufferPool.hpp"
@@ -6982,6 +6984,161 @@ void resourceTests() {
     }
 }
 
+void unsetFormatStorageImageTests() {
+    using ShaderRecompiler::DescriptorBinding;
+    using ShaderRecompiler::DescriptorImageShape;
+    using ShaderRecompiler::DescriptorKind;
+    using ShaderRecompiler::DescriptorRole;
+    constexpr std::uint32_t Format8888UNorm = 56;
+    constexpr std::uint32_t Type2D = 9;
+    alignas(256) std::array<std::byte, 4096> guest{};
+    const auto base = reinterpret_cast<std::uint64_t>(guest.data());
+    const auto words = [](std::uint32_t format, std::uint64_t baseAddress) {
+        return std::vector<std::uint32_t>{
+            static_cast<std::uint32_t>(baseAddress >> 8u),
+            static_cast<std::uint32_t>((baseAddress >> 40u) & 0xffu) | ((format & 0x1ffu) << 20u) | (3u << 30u),
+            3u | (15u << 14u),
+            0xfacu | (Type2D << 28u),
+            0u,
+            0u,
+            0u,
+            0u,
+        };
+    };
+    const auto storage = [&](std::uint32_t format, std::uint64_t baseAddress) {
+        DescriptorBinding binding{};
+        binding.kind = DescriptorKind::StorageImage;
+        binding.role = DescriptorRole::GuestImages;
+        binding.binding = ShaderRecompiler::RuntimeAbi::FirstStorageImageBinding;
+        binding.count = 1;
+        binding.imageWritten = {true};
+        binding.guestDescriptor = words(format, baseAddress);
+        return binding;
+    };
+    for (const std::uint32_t format : {0u, 0x1ffu}) {
+        mock = MockVulkan{};
+        auto context = mockContext();
+        context.device = makeHandle<VkDevice>();
+        context.limits.maxPerStageDescriptorStorageImages = 8;
+        context.limits.maxDescriptorSetStorageImages = 8;
+        ShaderRecompiler::RecompileResult vertex;
+        ShaderRecompiler::RecompileResult fragment;
+        vertex.bindings.push_back(storage(format, base));
+        const auto color = AgcDriver::Graphics::DecodeState(makeState()).color;
+        {
+            AgcDriver::Graphics::TextureDetiler detiler(context);
+            context.detiler = &detiler;
+            expectFailure([&] { AgcDriver::Graphics::ShaderResources resources(context, vertex, fragment, color, 0, 0); }, "unsupported guest texture format");
+        }
+        Require(mock.live == 0, "a rejected unset-format storage image leaked Vulkan objects");
+    }
+    {
+        mock = MockVulkan{};
+        auto context = mockContext();
+        context.device = makeHandle<VkDevice>();
+        context.limits.maxPerStageDescriptorSampledImages = 8;
+        context.limits.maxDescriptorSetSampledImages = 8;
+        ShaderRecompiler::RecompileResult vertex;
+        ShaderRecompiler::RecompileResult fragment;
+        auto sampled = storage(0u, base);
+        sampled.kind = DescriptorKind::SampledImage;
+        sampled.binding = ShaderRecompiler::RuntimeAbi::FirstImageBinding;
+        sampled.imageWritten.clear();
+        sampled.imageShape = DescriptorImageShape::Image2D;
+        sampled.imageSamplers = {0};
+        vertex.bindings.push_back(sampled);
+        const auto color = AgcDriver::Graphics::DecodeState(makeState()).color;
+        {
+            AgcDriver::Graphics::TextureDetiler detiler(context);
+            context.detiler = &detiler;
+            AgcDriver::Graphics::TextureCache textureCache(context);
+            context.textureCache = &textureCache;
+            AgcDriver::Graphics::ShaderResources resources(context, vertex, fragment, color, 0, 0);
+        }
+        Require(mock.live == 0, "a sampled unset-format image leaked Vulkan objects");
+    }
+    {
+        mock = MockVulkan{};
+        auto context = mockContext();
+        context.device = makeHandle<VkDevice>();
+        context.limits.maxPerStageDescriptorSampledImages = 8;
+        context.limits.maxDescriptorSetSampledImages = 8;
+        ShaderRecompiler::RecompileResult vertex;
+        ShaderRecompiler::RecompileResult fragment;
+        auto sampled = storage(0u, base);
+        sampled.kind = DescriptorKind::SampledImage;
+        sampled.binding = ShaderRecompiler::RuntimeAbi::FirstImageBinding;
+        sampled.imageWritten.clear();
+        sampled.imageShape = DescriptorImageShape::Image1DArray;
+        sampled.imageSamplers = {0};
+        sampled.guestDescriptor[3] = (sampled.guestDescriptor[3] & ~(0xfu << 28u)) | (12u << 28u);
+        vertex.bindings.push_back(sampled);
+        const auto color = AgcDriver::Graphics::DecodeState(makeState()).color;
+        {
+            AgcDriver::Graphics::TextureDetiler detiler(context);
+            context.detiler = &detiler;
+            AgcDriver::Graphics::TextureCache textureCache(context);
+            context.textureCache = &textureCache;
+            AgcDriver::Graphics::ShaderResources resources(context, vertex, fragment, color, 0, 0);
+        }
+        Require(mock.live == 0, "a sampled TYPE 12 image with an unset format leaked Vulkan objects");
+    }
+    for (const std::uint32_t format : {0u, 0x1ffu}) {
+        mock = MockVulkan{};
+        auto context = mockContext();
+        context.device = makeHandle<VkDevice>();
+        context.limits.maxPerStageDescriptorSampledImages = 8;
+        context.limits.maxDescriptorSetSampledImages = 8;
+        ShaderRecompiler::RecompileResult vertex;
+        ShaderRecompiler::RecompileResult fragment;
+        auto sampled = storage(format, base);
+        sampled.kind = DescriptorKind::SampledImage;
+        sampled.binding = ShaderRecompiler::RuntimeAbi::FirstImageBinding;
+        sampled.imageWritten.clear();
+        sampled.imageShape = DescriptorImageShape::Image2D;
+        sampled.imageSamplers = {0};
+        sampled.guestDescriptor[3] = (sampled.guestDescriptor[3] & ~(0xfu << 28u)) | (2u << 28u);
+        vertex.bindings.push_back(sampled);
+        const auto color = AgcDriver::Graphics::DecodeState(makeState()).color;
+        {
+            AgcDriver::Graphics::TextureDetiler detiler(context);
+            context.detiler = &detiler;
+            AgcDriver::Graphics::TextureCache textureCache(context);
+            context.textureCache = &textureCache;
+            expectFailure([&] { AgcDriver::Graphics::ShaderResources resources(context, vertex, fragment, color, 0, 0); }, "unsupported image type 2");
+        }
+        Require(mock.live == 0, "a rejected reserved-type sampled image leaked Vulkan objects");
+    }
+    {
+        mock = MockVulkan{};
+        auto context = mockContext();
+        context.device = makeHandle<VkDevice>();
+        context.limits.maxPerStageDescriptorStorageImages = 8;
+        context.limits.maxDescriptorSetStorageImages = 8;
+        ShaderRecompiler::RecompileResult vertex;
+        ShaderRecompiler::RecompileResult fragment;
+        vertex.bindings.push_back(storage(0u, 0));
+        const auto color = AgcDriver::Graphics::DecodeState(makeState()).color;
+        {
+            AgcDriver::Graphics::TextureDetiler detiler(context);
+            context.detiler = &detiler;
+            AgcDriver::Graphics::ShaderResources resources(context, vertex, fragment, color, 0, 0);
+        }
+        Require(mock.live == 0, "a null storage image with an unset format leaked Vulkan objects");
+    }
+    {
+        ShaderRecompiler::RecompileResult compiled;
+        compiled.bindings.push_back(storage(Format8888UNorm, base));
+        bool bounded = false;
+        const auto ranges = AgcDriver::DriverDetail::DispatchWriteRanges(compiled, bounded);
+        Require(ranges.size() == 1 && ranges[0].first == base && ranges[0].second == base + 4096u, "a written storage image did not contribute its whole surface to the dispatch write ranges");
+        compiled.bindings.front().guestDescriptor = words(0u, base);
+        expectFailure([&] { static_cast<void>(AgcDriver::DriverDetail::DispatchWriteRanges(compiled, bounded)); }, "unsupported guest texture format");
+        compiled.bindings.front().guestDescriptor = words(0u, 0u);
+        Require(AgcDriver::DriverDetail::DispatchWriteRanges(compiled, bounded).empty(), "a null written storage image contributed dispatch write ranges");
+    }
+}
+
 void descriptorCacheTests() {
     mock = MockVulkan{};
     auto context = mockContext();
@@ -13321,6 +13478,7 @@ int main(int argc, char** argv) {
         descriptorPoolTests();
         pushConstantTests();
         resourceTests();
+        unsetFormatStorageImageTests();
         oversizedDescriptorTests();
         viewAtRangeLimitTests();
         guestBufferViewBytesTests();
diff --git a/core/libs/prx/libSceAgcDriver/tests/GuestTextureResource.cpp b/core/libs/prx/libSceAgcDriver/tests/GuestTextureResource.cpp
index 54799df27a..2854acd563 100644
--- a/core/libs/prx/libSceAgcDriver/tests/GuestTextureResource.cpp
+++ b/core/libs/prx/libSceAgcDriver/tests/GuestTextureResource.cpp
@@ -158,6 +158,23 @@ void RunGuestTextureResourceTests() {
     const std::array<std::uint32_t, 8> reportedStorage{0x04efd000u, 0x00040011u, 0x00017a00u, 0x00005204u, 0x0af00000u, 0u, 0x00000612u, 0x00fff000u};
     Require(IsNullTextureResource(reportedStorage), "the type-0 words of a written storage slot were not classified as null");
     reject([&] { static_cast<void>(DecodeTextureResource(reportedStorage)); }, "guest texture descriptor");
+    Fields unsetFormat = base;
+    unsetFormat.format = 0u;
+    unsetFormat.typeRaw = 12u;
+    Require(!IsNullTextureResource(pack(unsetFormat)), "a zero-format texture was classified as null for every consumer");
+    Require(IsNullSampledTextureResource(pack(unsetFormat)), "a zero-format image-type texture was not classified as null for a sampled consumer");
+    reject([] { ResolveTextureFormat(0u); }, "unsupported guest texture format");
+    unsetFormat.format = 0x1ffu;
+    Require(!IsNullTextureResource(pack(unsetFormat)), "an all-ones-format texture was classified as null for every consumer");
+    Require(IsNullSampledTextureResource(pack(unsetFormat)), "an all-ones-format image-type texture was not classified as null for a sampled consumer");
+    reject([] { ResolveTextureFormat(0x1ffu); }, "unsupported guest texture format");
+    unsetFormat.typeRaw = 2u;
+    unsetFormat.format = 0u;
+    Require(!IsNullSampledTextureResource(pack(unsetFormat)), "a reserved type-2 texture with a zero format was classified as null for a sampled consumer");
+    unsetFormat.format = 0x1ffu;
+    Require(!IsNullSampledTextureResource(pack(unsetFormat)), "a reserved type-2 texture with an all-ones format was classified as null for a sampled consumer");
+    unsetFormat.typeRaw = 15u;
+    Require(!IsNullSampledTextureResource(pack(unsetFormat)), "a type-15 texture with an unset format was classified as null for a sampled consumer");
     auto result = DecodeTextureResource(pack(base));
     Require(result.baseAddress == (base.base40 << 8u), "decoded base address changed");
     Require(result.width == 16 && result.height == 16, "decoded width or height changed");
diff --git a/core/libs/prx/libSceAgcDriver/tests/ShaderMemory.cpp b/core/libs/prx/libSceAgcDriver/tests/ShaderMemory.cpp
index 82f5087838..a17078c1b1 100644
--- a/core/libs/prx/libSceAgcDriver/tests/ShaderMemory.cpp
+++ b/core/libs/prx/libSceAgcDriver/tests/ShaderMemory.cpp
@@ -2104,7 +2104,7 @@ void verifyTypeZeroImageMaterialization() {
 
     {
         auto tornT = oldT;
-        tornT[1] &= ~(0x1ffu << 20u);
+        tornT[3] = (tornT[3] & ~(0xfu << 28u)) | (2u << 28u);
         srt.fill(0u);
         std::copy(tornT.begin(), tornT.end(), srt.begin());
         std::copy(outputV.begin(), outputV.end(), srt.begin() + 16u);
@@ -2145,7 +2145,7 @@ void verifyTypeZeroImageMaterialization() {
 
     {
         auto tornT = oldT;
-        tornT[1] &= ~(0x1ffu << 20u);
+        tornT[3] = (tornT[3] & ~(0xfu << 28u)) | (2u << 28u);
         srt.fill(0u);
         std::copy(tornT.begin(), tornT.end(), srt.begin());
         std::copy(outputV.begin(), outputV.end(), srt.begin() + 16u);
@@ -2366,6 +2366,68 @@ void verifyTypeZeroImageMaterialization() {
     }
 }
 
+void verifyUnsetFormatImageMaterialization() {
+    using namespace ShaderRecompiler;
+    constexpr std::array<std::uint32_t, 8> measuredImage{0xffffffffu, 0xffffffffu, 0x00000019u, 0xc0017901u, 0x00000342u, 0xc8000000u, 0xc0064900u, 0x0000062fu};
+    const auto materialize = [](const std::array<std::uint32_t, 8>& words, const ImageResource& image) {
+        IrResourcePlan plan;
+        plan.srtPlanComplete = true;
+        plan.resourceTrackingComplete = true;
+        plan.userDataCount = 0u;
+        plan.materializationSources = {0u};
+        std::vector<std::unique_ptr<IrValue>> values;
+        DescriptorSource source;
+        source.dwordCount = static_cast<std::uint32_t>(words.size());
+        for (std::uint32_t i = 0u; i < words.size(); ++i) {
+            auto value = std::make_unique<IrValue>(IrOpcode::Void, IrType::U32, i);
+            value->SetImmediateU32(words[i]);
+            source.dwords[i] = value.get();
+            values.push_back(std::move(value));
+        }
+        plan.descriptorSources.push_back(source);
+        plan.info.images.push_back(image);
+        plan.info.runtimeImageModes.push_back(ResourceMaterializer::RuntimeImageModes(image));
+        ResourceSnapshot snapshot;
+        ResourceMaterializer{}.Materialize(plan, SrtRuntime{}, snapshot);
+        return snapshot;
+    };
+    ImageResource sampled;
+    sampled.source = 0u;
+    sampled.resourceClass = ImageResourceClass::Sampled;
+    sampled.dimension = RdnaImageDimension::Dim1DArray;
+    sampled.read = true;
+    for (const std::uint32_t format : {0u, 0x1ffu}) {
+        auto words = measuredImage;
+        words[1] = (words[1] & ~(0x1ffu << 20u)) | (format << 20u);
+        const auto snapshot = materialize(words, sampled);
+        require(snapshot.images.size() == 1u && snapshot.images[0].dwordCount == 8u && snapshot.images[0].dwords == words,
+                "an unset-format measured image-type T# was rejected or altered during materialization");
+        for (const bool atomic : {false, true}) {
+            auto storage = sampled;
+            storage.resourceClass = ImageResourceClass::Storage;
+            storage.read = false;
+            storage.written = !atomic;
+            storage.atomic = atomic;
+            bool rejected = false;
+            try {
+                static_cast<void>(materialize(words, storage));
+            } catch (const std::runtime_error& error) {
+                rejected = std::string_view(error.what()).find("image descriptor") != std::string_view::npos;
+            }
+            require(rejected, atomic ? "an unset-format atomic image descriptor was accepted" : "an unset-format writable image descriptor was accepted");
+        }
+    }
+    const auto expectInvalidType = [&](std::uint32_t type, const char* message) {
+        auto words = measuredImage;
+        words[1] &= ~(0x1ffu << 20u);
+        words[3] = (words[3] & ~(0xfu << 28u)) | (type << 28u);
+        expectFailure([&] { static_cast<void>(materialize(words, sampled)); }, "runtime image descriptor is invalid", message);
+    };
+    expectInvalidType(2u, "a reserved TYPE 2 T# with an unset format was accepted as a null image");
+    expectInvalidType(7u, "a reserved TYPE 7 T# with an unset format was accepted as a null image");
+    expectInvalidType(15u, "an unimplemented TYPE 15 T# with an unset format was accepted as a null image");
+}
+
 void verifyOutOfRangeConstantReads() {
     std::vector<std::uint32_t> code{0xf40c0200u, 0xfa000000u, 0xf4080500u, 0xfa000020u, 0xf4080600u, 0xfa000040u, 0xf4000400u, 0xfa000050u, 0xf4080a00u, 0xfa000080u, 0xbf8cc07fu, 0xf42c0814u, 0xfa000000u, 0xbf8cc07fu, 0xbf068010u, 0xbf850008u};
     for (std::uint32_t dword = 0; dword < 8u; dword++) {
@@ -2773,6 +2835,22 @@ void verifyGuardedDescriptorSources() {
         AgcDriver::ShaderMemory memory({});
         expectFailure([&] { static_cast<void>(memory.Capture(request)); }, "runtime image descriptor is invalid", "guarded sources: an invalid T# behind a taken branch was accepted");
     }
+    auto unsetFormat = valid;
+    unsetFormat[1] = valid[1] & ~(0x1ffu << 20u);
+    fill(unsetFormat, 1u);
+    {
+        AgcDriver::ShaderMemory memory({});
+        const auto capture = memory.Capture(request);
+        require(capture->snapshot.images.size() == 1u && capture->snapshot.images[0].dwords == unsetFormat, "guarded sources: a T# with an unset format behind a taken branch was rejected or altered");
+    }
+    auto filledFormat = valid;
+    filledFormat[1] = valid[1] | (0x1ffu << 20u);
+    fill(filledFormat, 1u);
+    {
+        AgcDriver::ShaderMemory memory({});
+        const auto capture = memory.Capture(request);
+        require(capture->snapshot.images.size() == 1u && capture->snapshot.images[0].dwords == filledFormat, "guarded sources: a T# with an all-ones format behind a taken branch was rejected or altered");
+    }
     auto typeOne = valid;
     typeOne[3] = 0xfacu | (1u << 28u);
     fill(typeOne, 1u);
@@ -10894,6 +10972,7 @@ int main(int argc, char** argv) {
         verifyLayoutPair();
         verifySignedSrtComparison();
         verifyTypeZeroImageMaterialization();
+        verifyUnsetFormatImageMaterialization();
         verifyOutOfRangeConstantReads();
         verifySignedMinimum();
         verifyMayEvaluate();