diff --git a/.github/scripts/install-musl-build-tools.sh b/.github/scripts/install-musl-build-tools.sh
index bd392b85480..e4c6683d0e6 100644
--- a/.github/scripts/install-musl-build-tools.sh
+++ b/.github/scripts/install-musl-build-tools.sh
@@ -17,7 +17,7 @@ if [[ -n "${APT_INSTALL_ARGS:-}" ]]; then
 fi
 
 sudo apt-get update "${apt_update_args[@]}"
-sudo apt-get install -y "${apt_install_args[@]}" musl-tools pkg-config libcap-dev g++ clang libc++-dev libc++abi-dev lld
+sudo apt-get install -y "${apt_install_args[@]}" ca-certificates curl musl-tools pkg-config libcap-dev g++ clang libc++-dev libc++abi-dev lld xz-utils
 
 case "${TARGET}" in
   x86_64-unknown-linux-musl)
@@ -32,6 +32,11 @@ case "${TARGET}" in
     ;;
 esac
 
+libcap_version="2.75"
+libcap_sha256="de4e7e064c9ba451d5234dd46e897d7c71c96a9ebf9a0c445bc04f4742d83632"
+libcap_tarball_name="libcap-${libcap_version}.tar.xz"
+libcap_download_url="https://mirrors.edge.kernel.org/pub/linux/libs/security/linux-privs/libcap2/${libcap_tarball_name}"
+
 # Use the musl toolchain as the Rust linker to avoid Zig injecting its own CRT.
 if command -v "${arch}-linux-musl-gcc" >/dev/null; then
   musl_linker="$(command -v "${arch}-linux-musl-gcc")"
@@ -47,6 +52,43 @@ runner_temp="${RUNNER_TEMP:-/tmp}"
 tool_root="${runner_temp}/codex-musl-tools-${TARGET}"
 mkdir -p "${tool_root}"
 
+libcap_root="${tool_root}/libcap-${libcap_version}"
+libcap_src_root="${libcap_root}/src"
+libcap_prefix="${libcap_root}/prefix"
+libcap_pkgconfig_dir="${libcap_prefix}/lib/pkgconfig"
+
+if [[ ! -f "${libcap_prefix}/lib/libcap.a" ]]; then
+  mkdir -p "${libcap_src_root}" "${libcap_prefix}/lib" "${libcap_prefix}/include/sys" "${libcap_prefix}/include/linux" "${libcap_pkgconfig_dir}"
+  libcap_tarball="${libcap_root}/${libcap_tarball_name}"
+
+  curl -fsSL "${libcap_download_url}" -o "${libcap_tarball}"
+  echo "${libcap_sha256}  ${libcap_tarball}" | sha256sum -c -
+
+  tar -xJf "${libcap_tarball}" -C "${libcap_src_root}"
+  libcap_source_dir="${libcap_src_root}/libcap-${libcap_version}"
+  make -C "${libcap_source_dir}/libcap" -j"$(nproc)" \
+    CC="${musl_linker}" \
+    AR=ar \
+    RANLIB=ranlib
+
+  cp "${libcap_source_dir}/libcap/libcap.a" "${libcap_prefix}/lib/libcap.a"
+  cp "${libcap_source_dir}/libcap/include/uapi/linux/capability.h" "${libcap_prefix}/include/linux/capability.h"
+  cp "${libcap_source_dir}/libcap/../libcap/include/sys/capability.h" "${libcap_prefix}/include/sys/capability.h"
+
+  cat > "${libcap_pkgconfig_dir}/libcap.pc" <<EOF
+prefix=${libcap_prefix}
+exec_prefix=\${prefix}
+libdir=\${prefix}/lib
+includedir=\${prefix}/include
+
+Name: libcap
+Description: Linux capabilities
+Version: ${libcap_version}
+Libs: -L\${libdir} -lcap
+Cflags: -I\${includedir}
+EOF
+fi
+
 sysroot=""
 if command -v zig >/dev/null; then
   zig_bin="$(command -v zig)"
@@ -220,6 +262,14 @@ echo "CMAKE_ARGS=-DCMAKE_HAVE_THREADS_LIBRARY=1 -DCMAKE_USE_PTHREADS_INIT=1 -DCM
 
 # Allow pkg-config resolution during cross-compilation.
 echo "PKG_CONFIG_ALLOW_CROSS=1" >> "$GITHUB_ENV"
+pkg_config_path="${libcap_pkgconfig_dir}"
+if [[ -n "${PKG_CONFIG_PATH:-}" ]]; then
+  pkg_config_path="${pkg_config_path}:${PKG_CONFIG_PATH}"
+fi
+echo "PKG_CONFIG_PATH=${pkg_config_path}" >> "$GITHUB_ENV"
+pkg_config_path_var="PKG_CONFIG_PATH_${TARGET}"
+pkg_config_path_var="${pkg_config_path_var//-/_}"
+echo "${pkg_config_path_var}=${libcap_pkgconfig_dir}" >> "$GITHUB_ENV"
 
 if [[ -n "${sysroot}" && "${sysroot}" != "/" ]]; then
   echo "PKG_CONFIG_SYSROOT_DIR=${sysroot}" >> "$GITHUB_ENV"
diff --git a/.github/workflows/rust-ci.yml b/.github/workflows/rust-ci.yml
index f9c866e57cc..c52013149c5 100644
--- a/.github/workflows/rust-ci.yml
+++ b/.github/workflows/rust-ci.yml
@@ -99,6 +99,8 @@ jobs:
       USE_SCCACHE: ${{ startsWith(matrix.runner, 'windows') && 'false' || 'true' }}
       CARGO_INCREMENTAL: "0"
       SCCACHE_CACHE_SIZE: 10G
+      # In rust-ci, representative release-profile checks use thin LTO for faster feedback.
+      CARGO_PROFILE_RELEASE_LTO: ${{ matrix.profile == 'release' && 'thin' || 'fat' }}
 
     strategy:
       fail-fast: false
@@ -160,6 +162,12 @@ jobs:
             runs_on:
               group: codex-runners
               labels: codex-linux-x64
+          - runner: ubuntu-24.04-arm
+            target: aarch64-unknown-linux-musl
+            profile: release
+            runs_on:
+              group: codex-runners
+              labels: codex-linux-arm64
           - runner: windows-x64
             target: x86_64-pc-windows-msvc
             profile: release