diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
index d4d11266a0..9b7fc1c7bd 100755
--- a/util/crossgcc/buildgcc
+++ b/util/crossgcc/buildgcc
@@ -39,7 +39,7 @@ GCC_VERSION=11.2.0
 BINUTILS_VERSION=2.37
 IASL_VERSION=20220331
 # CLANG version number
-CLANG_VERSION=14.0.6
+CLANG_VERSION=15.0.0
 CMAKE_VERSION=3.24.2
 NASM_VERSION=2.15.05
 
@@ -58,12 +58,13 @@ LLVM_ARCHIVE="https://github.com/llvm/llvm-project/releases/download/llvmorg-${C
 CLANG_ARCHIVE="https://github.com/llvm/llvm-project/releases/download/llvmorg-${CLANG_VERSION}/clang-${CLANG_VERSION}.src.tar.xz"
 CRT_ARCHIVE="https://github.com/llvm/llvm-project/releases/download/llvmorg-${CLANG_VERSION}/compiler-rt-${CLANG_VERSION}.src.tar.xz"
 CTE_ARCHIVE="https://github.com/llvm/llvm-project/releases/download/llvmorg-${CLANG_VERSION}/clang-tools-extra-${CLANG_VERSION}.src.tar.xz"
+LLVMCMAKE_ARCHIVE="https://github.com/llvm/llvm-project/releases/download/llvmorg-${CLANG_VERSION}/cmake-${CLANG_VERSION}.src.tar.xz"
 CMAKE_ARCHIVE="https://cmake.org/files/v${CMAKE_VERSION%.*}/cmake-${CMAKE_VERSION}.tar.gz"
 NASM_ARCHIVE="https://www.nasm.us/pub/nasm/releasebuilds/${NASM_VERSION}/nasm-${NASM_VERSION}.tar.bz2"
 
 ALL_ARCHIVES="$GMP_ARCHIVE $MPFR_ARCHIVE $MPC_ARCHIVE \
 	$GCC_ARCHIVE $BINUTILS_ARCHIVE $IASL_ARCHIVE \
-	$LLVM_ARCHIVE $CLANG_ARCHIVE \
+	$LLVM_ARCHIVE $CLANG_ARCHIVE $LLVMCMAKE_ARCHIVE \
 	$CRT_ARCHIVE $CTE_ARCHIVE $CMAKE_ARCHIVE $NASM_ARCHIVE"
 
 # GCC toolchain directories
@@ -80,6 +81,7 @@ LLVM_DIR="llvm-${CLANG_VERSION}.src"
 CLANG_DIR="clang-${CLANG_VERSION}.src"
 CRT_DIR="compiler-rt-${CLANG_VERSION}.src"
 CTE_DIR="clang-tools-extra-${CLANG_VERSION}.src"
+LLVMCMAKE_DIR="cmake-${CLANG_VERSION}.src"
 CMAKE_DIR="cmake-${CMAKE_VERSION}"
 NASM_DIR="nasm-${NASM_VERSION}"
 
@@ -806,6 +808,7 @@ build_LLVM() {
 	ln -nsf "$CLANG_DIR" ../clang
 	ln -nsf "$CTE_DIR" ../clang-tools-extra
 	ln -nsf "$CRT_DIR" ../compiler-rt
+	ln -nsf "$LLVMCMAKE_DIR" ../cmake
 
 	$CMAKE -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$DESTDIR$TARGETDIR" \
 		-DCLANG_VENDOR="coreboot toolchain v$CROSSGCC_VERSION - " \
@@ -956,7 +959,7 @@ case "$PACKAGE" in
 	CLANG|clang)
 		NAME="LLVM clang"
 		LLVM_VERSION=${CLANG_VERSION}
-		PACKAGES="CMAKE LLVM CLANG CRT CTE"
+		PACKAGES="CMAKE LLVM CLANG CRT CTE LLVMCMAKE"
 		CMAKE=${DESTDIR}${TARGETDIR}/bin/cmake
 		;;
 	IASL|iasl)
diff --git a/util/crossgcc/sum/clang-14.0.6.src.tar.xz.cksum b/util/crossgcc/sum/clang-14.0.6.src.tar.xz.cksum
deleted file mode 100644
index fbef3e1d9b..0000000000
--- a/util/crossgcc/sum/clang-14.0.6.src.tar.xz.cksum
+++ /dev/null
@@ -1 +0,0 @@
-88442d295bc0b96df7cf3d526ed9eabd7a214ac2  tarballs/clang-14.0.6.src.tar.xz
diff --git a/util/crossgcc/sum/clang-15.0.0.src.tar.xz.cksum b/util/crossgcc/sum/clang-15.0.0.src.tar.xz.cksum
new file mode 100644
index 0000000000..b83f55cc8f
--- /dev/null
+++ b/util/crossgcc/sum/clang-15.0.0.src.tar.xz.cksum
@@ -0,0 +1 @@
+7b47dbb51bd2de28174d8425f4fe9523880bc7b8  tarballs/clang-15.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/clang-tools-extra-14.0.6.src.tar.xz.cksum b/util/crossgcc/sum/clang-tools-extra-14.0.6.src.tar.xz.cksum
deleted file mode 100644
index e816ec2b18..0000000000
--- a/util/crossgcc/sum/clang-tools-extra-14.0.6.src.tar.xz.cksum
+++ /dev/null
@@ -1 +0,0 @@
-dac5046f0eb81e6c47432cf80229599befbf273e  tarballs/clang-tools-extra-14.0.6.src.tar.xz
diff --git a/util/crossgcc/sum/clang-tools-extra-15.0.0.src.tar.xz.cksum b/util/crossgcc/sum/clang-tools-extra-15.0.0.src.tar.xz.cksum
new file mode 100644
index 0000000000..58fa9d88d7
--- /dev/null
+++ b/util/crossgcc/sum/clang-tools-extra-15.0.0.src.tar.xz.cksum
@@ -0,0 +1 @@
+65c804e2539753ab350a0960b378ce66bc57b0e9  tarballs/clang-tools-extra-15.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/cmake-15.0.0.src.tar.xz.cksum b/util/crossgcc/sum/cmake-15.0.0.src.tar.xz.cksum
new file mode 100644
index 0000000000..4bf97ee2af
--- /dev/null
+++ b/util/crossgcc/sum/cmake-15.0.0.src.tar.xz.cksum
@@ -0,0 +1 @@
+56ca883308b1b30cb981c86038eb677db9cc8eb5  tarballs/cmake-15.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/compiler-rt-14.0.6.src.tar.xz.cksum b/util/crossgcc/sum/compiler-rt-14.0.6.src.tar.xz.cksum
deleted file mode 100644
index 5b4f25b4f3..0000000000
--- a/util/crossgcc/sum/compiler-rt-14.0.6.src.tar.xz.cksum
+++ /dev/null
@@ -1 +0,0 @@
-91f03b578aff0fda6b9d3e2185e6ea5e588c6d47  tarballs/compiler-rt-14.0.6.src.tar.xz
diff --git a/util/crossgcc/sum/compiler-rt-15.0.0.src.tar.xz.cksum b/util/crossgcc/sum/compiler-rt-15.0.0.src.tar.xz.cksum
new file mode 100644
index 0000000000..add3a4414c
--- /dev/null
+++ b/util/crossgcc/sum/compiler-rt-15.0.0.src.tar.xz.cksum
@@ -0,0 +1 @@
+15879f50459c7b2e7b5fb77c6b845c39c91a04fc  tarballs/compiler-rt-15.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/llvm-14.0.6.src.tar.xz.cksum b/util/crossgcc/sum/llvm-14.0.6.src.tar.xz.cksum
deleted file mode 100644
index 4e1de3efa1..0000000000
--- a/util/crossgcc/sum/llvm-14.0.6.src.tar.xz.cksum
+++ /dev/null
@@ -1 +0,0 @@
-975020d4f7164d84a89f0f9b2153dd870d06e02d  tarballs/llvm-14.0.6.src.tar.xz
diff --git a/util/crossgcc/sum/llvm-15.0.0.src.tar.xz.cksum b/util/crossgcc/sum/llvm-15.0.0.src.tar.xz.cksum
new file mode 100644
index 0000000000..0e033aaef2
--- /dev/null
+++ b/util/crossgcc/sum/llvm-15.0.0.src.tar.xz.cksum
@@ -0,0 +1 @@
+6f7f53d45ae8d207a6d72fd8ac380160f240d37e  tarballs/llvm-15.0.0.src.tar.xz