diff --git a/.github/workflows/integrate.yaml b/.github/workflows/integrate.yaml
index 4b2d68d..259b471 100644
--- a/.github/workflows/integrate.yaml
+++ b/.github/workflows/integrate.yaml
@@ -238,3 +238,30 @@ jobs:
 
             -   name: "Run E2E tests"
                 run: "./e2e/test-finders.sh"
+
+    e2e-ubuntu-restricted:
+        name: "End-to-End tests Ubuntu (restricted)"
+        runs-on: "ubuntu-latest"
+        strategy:
+            matrix:
+                php-version:
+                    - "8.1"
+        steps:
+            -   name: "Checkout"
+                uses: "actions/checkout@v3.1.0"
+
+            -   name: "Set up PHP"
+                uses: "shivammathur/setup-php@2.22.0"
+                with:
+                    coverage: "xdebug"
+                    php-version: "${{ matrix.php-version }}"
+                    tools: "phive"
+
+            -   name: "Install Composer dependencies"
+                uses: "ramsey/composer-install@v2"
+
+            -   name: "Setup the expected output"
+                run: "mv e2e/expected-output-ubuntu-restricted e2e/expected-output"
+
+            -   name: "Run E2E tests"
+                run: "./e2e/test-restricted-finders.sh"
diff --git a/e2e/expected-output-ubuntu-restricted b/e2e/expected-output-ubuntu-restricted
new file mode 100644
index 0000000..d71e9f1
--- /dev/null
+++ b/e2e/expected-output-ubuntu-restricted
@@ -0,0 +1,13 @@
+CpuInfoFinder: F
+DummyCpuCoreFinder(value=1): .
+HwLogicalFinder: F
+HwPhysicalFinder: F
+_NProcessorFinder: F
+NProcessorFinder: F
+NProcFinder(all=true): F
+NProcFinder(all=false): F
+NullCpuCoreFinder: F
+OnlyOnWindowsFinder(DummyCpuCoreFinder(value=1)): F
+SkipOnWindowsFinder(DummyCpuCoreFinder(value=1)): .
+WmicPhysicalFinder: F
+WmicLogicalFinder: F
diff --git a/e2e/test-restricted-finders.sh b/e2e/test-restricted-finders.sh
new file mode 100755
index 0000000..5c91d25
--- /dev/null
+++ b/e2e/test-restricted-finders.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+execute_finders() {
+    php -d open_basedir="$(cd .. && pwd):$(php -r 'echo sys_get_temp_dir();')" -d disable_functions="pcntl_exec,pcntl_fork,exec,passthru,proc_open,shell_exec,system,popen" "$(pwd)/e2e/execute-finders.php" 2>&1
+}
+
+execute_finders > $(pwd)/e2e/actual-output
+
+diff --ignore-all-space e2e/expected-output e2e/actual-output
diff --git a/src/Finder/CpuInfoFinder.php b/src/Finder/CpuInfoFinder.php
index 9a5864f..dea4c41 100644
--- a/src/Finder/CpuInfoFinder.php
+++ b/src/Finder/CpuInfoFinder.php
@@ -73,11 +73,11 @@ public function toString(): string
 
     private static function getCpuInfo(): ?string
     {
-        if (!is_file(self::CPU_INFO_PATH)) {
+        if (!@is_file(self::CPU_INFO_PATH)) {
             return null;
         }
 
-        $cpuInfo = file_get_contents(self::CPU_INFO_PATH);
+        $cpuInfo = @file_get_contents(self::CPU_INFO_PATH);
 
         return false === $cpuInfo
             ? null