diff --git a/codex-rs/core/tests/common/lib.rs b/codex-rs/core/tests/common/lib.rs
index a26cd5ae77..b5ef6dd355 100644
--- a/codex-rs/core/tests/common/lib.rs
+++ b/codex-rs/core/tests/common/lib.rs
@@ -483,3 +483,28 @@ macro_rules! skip_if_windows {
         }
     }};
 }
+
+pub fn is_github_actions_linux_aarch64() -> bool {
+    cfg!(all(target_os = "linux", target_arch = "aarch64"))
+        && ::std::env::var("GITHUB_ACTIONS").is_ok()
+}
+
+#[macro_export]
+macro_rules! skip_if_github_actions_linux_aarch64 {
+    () => {{
+        if $crate::is_github_actions_linux_aarch64() {
+            println!(
+                "Skipping test because the default Linux sandbox is unavailable on GitHub Actions linux-aarch64."
+            );
+            return;
+        }
+    }};
+    ($return_value:expr $(,)?) => {{
+        if $crate::is_github_actions_linux_aarch64() {
+            println!(
+                "Skipping test because the default Linux sandbox is unavailable on GitHub Actions linux-aarch64."
+            );
+            return $return_value;
+        }
+    }};
+}
diff --git a/codex-rs/core/tests/suite/abort_tasks.rs b/codex-rs/core/tests/suite/abort_tasks.rs
index f56e229999..f2326c4189 100644
--- a/codex-rs/core/tests/suite/abort_tasks.rs
+++ b/codex-rs/core/tests/suite/abort_tasks.rs
@@ -12,6 +12,7 @@ use core_test_support::responses::mount_sse_once;
 use core_test_support::responses::mount_sse_sequence;
 use core_test_support::responses::sse;
 use core_test_support::responses::start_mock_server;
+use core_test_support::skip_if_github_actions_linux_aarch64;
 use core_test_support::test_codex::test_codex;
 use core_test_support::wait_for_event;
 use regex_lite::Regex;
@@ -70,6 +71,8 @@ async fn interrupt_long_running_tool_emits_turn_aborted() {
 /// responses server, and ensures the model receives the synthesized abort.
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn interrupt_tool_records_history_entries() {
+    skip_if_github_actions_linux_aarch64!();
+
     let command = "sleep 60";
     let call_id = "call-history";
 
diff --git a/codex-rs/core/tests/suite/approvals.rs b/codex-rs/core/tests/suite/approvals.rs
index 34934b3d4b..3168ede83c 100644
--- a/codex-rs/core/tests/suite/approvals.rs
+++ b/codex-rs/core/tests/suite/approvals.rs
@@ -31,6 +31,7 @@ use core_test_support::responses::ev_response_created;
 use core_test_support::responses::mount_sse_once;
 use core_test_support::responses::sse;
 use core_test_support::responses::start_mock_server;
+use core_test_support::skip_if_github_actions_linux_aarch64;
 use core_test_support::skip_if_no_network;
 use core_test_support::test_codex::TestCodex;
 use core_test_support::test_codex::test_codex;
@@ -1573,6 +1574,7 @@ fn scenarios() -> Vec<ScenarioSpec> {
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn approval_matrix_covers_all_modes() -> Result<()> {
+    skip_if_github_actions_linux_aarch64!(Ok(()));
     skip_if_no_network!(Ok(()));
 
     for scenario in scenarios() {
diff --git a/codex-rs/core/tests/suite/tool_parallelism.rs b/codex-rs/core/tests/suite/tool_parallelism.rs
index 357dcff0fd..d3daf2ba89 100644
--- a/codex-rs/core/tests/suite/tool_parallelism.rs
+++ b/codex-rs/core/tests/suite/tool_parallelism.rs
@@ -20,6 +20,7 @@ use core_test_support::responses::mount_sse_once;
 use core_test_support::responses::mount_sse_sequence;
 use core_test_support::responses::sse;
 use core_test_support::responses::start_mock_server;
+use core_test_support::skip_if_github_actions_linux_aarch64;
 use core_test_support::skip_if_no_network;
 use core_test_support::streaming_sse::StreamingSseChunk;
 use core_test_support::streaming_sse::start_streaming_sse_server;
@@ -141,6 +142,7 @@ async fn read_file_tools_run_in_parallel() -> anyhow::Result<()> {
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn shell_tools_run_in_parallel() -> anyhow::Result<()> {
+    skip_if_github_actions_linux_aarch64!(Ok(()));
     skip_if_no_network!(Ok(()));
 
     let server = start_mock_server().await;
diff --git a/codex-rs/core/tests/suite/tools.rs b/codex-rs/core/tests/suite/tools.rs
index 9f1803c75e..cfc325d891 100644
--- a/codex-rs/core/tests/suite/tools.rs
+++ b/codex-rs/core/tests/suite/tools.rs
@@ -21,6 +21,7 @@ use core_test_support::responses::mount_sse_once;
 use core_test_support::responses::mount_sse_sequence;
 use core_test_support::responses::sse;
 use core_test_support::responses::start_mock_server;
+use core_test_support::skip_if_github_actions_linux_aarch64;
 use core_test_support::skip_if_no_network;
 use core_test_support::test_codex::test_codex;
 use regex_lite::Regex;
@@ -190,6 +191,7 @@ async fn shell_escalated_permissions_rejected_then_ok() -> Result<()> {
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn sandbox_denied_shell_returns_original_output() -> Result<()> {
+    skip_if_github_actions_linux_aarch64!(Ok(()));
     skip_if_no_network!(Ok(()));
 
     let server = start_mock_server().await;
diff --git a/codex-rs/core/tests/suite/unified_exec.rs b/codex-rs/core/tests/suite/unified_exec.rs
index 705e415620..2384e027fa 100644
--- a/codex-rs/core/tests/suite/unified_exec.rs
+++ b/codex-rs/core/tests/suite/unified_exec.rs
@@ -24,6 +24,7 @@ use core_test_support::responses::ev_response_created;
 use core_test_support::responses::mount_sse_sequence;
 use core_test_support::responses::sse;
 use core_test_support::responses::start_mock_server;
+use core_test_support::skip_if_github_actions_linux_aarch64;
 use core_test_support::skip_if_no_network;
 use core_test_support::skip_if_sandbox;
 use core_test_support::skip_if_windows;
@@ -2493,6 +2494,7 @@ PY
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn unified_exec_runs_under_sandbox() -> Result<()> {
+    skip_if_github_actions_linux_aarch64!(Ok(()));
     skip_if_no_network!(Ok(()));
     skip_if_sandbox!(Ok(()));
     skip_if_windows!(Ok(()));