diff --git a/src/kernel/multiboot.cpp b/src/kernel/multiboot.cpp
index 6e8bf3b21..fb1d59a81 100644
--- a/src/kernel/multiboot.cpp
+++ b/src/kernel/multiboot.cpp
@@ -181,7 +181,8 @@ void kernel::multiboot(uint32_t boot_addr)
   if (info->flags & MULTIBOOT_INFO_CMDLINE) {
     const auto* cmdline = (const char*) (uintptr_t) info->cmdline;
     INFO2("* Booted with parameters @ {}: {}", (const void*)(uintptr_t)info->cmdline, cmdline);
-    kernel::state().cmdline = std::pmr::string(cmdline).data();
+    // Bootloader memory (_multiboot_free_begin); no temp .data()/strdup.
+    kernel::state().cmdline = cmdline;
   }
 
   if (info->flags & MULTIBOOT_INFO_MEM_MAP) {
diff --git a/src/platform/x86_pc/init_libc.cpp b/src/platform/x86_pc/init_libc.cpp
index ae39c919a..2e2c86eec 100644
--- a/src/platform/x86_pc/init_libc.cpp
+++ b/src/platform/x86_pc/init_libc.cpp
@@ -110,10 +110,13 @@ namespace x86
     argv[1] = 0x0;
     int argc = 1;
 
-    // Env vars
-    argv[2] = std::pmr::string("LC_CTYPE=C").data();
-    argv[3] = std::pmr::string("LC_ALL=C").data();
-    argv[4] = std::pmr::string("USER=root").data();
+    // Env vars (static storage — not .data() of a temporary pmr::string)
+    static char env_lc_ctype[] = "LC_CTYPE=C";
+    static char env_lc_all[]   = "LC_ALL=C";
+    static char env_user[]     = "USER=root";
+    argv[2] = env_lc_ctype;
+    argv[3] = env_lc_all;
+    argv[4] = env_user;
     argv[5] = 0x0;
 
     // auxiliary vector