diff --git a/stdlib/@tests/stubtest_allowlists/linux.txt b/stdlib/@tests/stubtest_allowlists/linux.txt
index 058563c14e50..e2b09917706f 100644
--- a/stdlib/@tests/stubtest_allowlists/linux.txt
+++ b/stdlib/@tests/stubtest_allowlists/linux.txt
@@ -137,5 +137,12 @@ _?socket.SOL_ROSE
 # not present on GitHub Actions runners.
 termios.TIOCTTYGSTRUCT
 
+# Only defined when Python was built against glibc 2.42 or newer
+(termios.B7200)?
+(termios.B14400)?
+(termios.B28800)?
+(termios.B76800)?
+(termios.IBSHIFT)?
+
 tkinter.Tk.createfilehandler  # Methods that come from __getattr__() at runtime
 tkinter.Tk.deletefilehandler  # Methods that come from __getattr__() at runtime
diff --git a/stdlib/termios.pyi b/stdlib/termios.pyi
index 971c9ad46bf4..5d9c81ed5488 100644
--- a/stdlib/termios.pyi
+++ b/stdlib/termios.pyi
@@ -186,12 +186,14 @@ if sys.platform != "win32":
         EXTPROC: Final[int]
         IUTF8: Final[int]
 
-    if sys.platform == "darwin" and sys.version_info >= (3, 13):
-        ALTWERASE: Final[int]
+        # On Linux, only available when Python was built against glibc 2.42 or newer.
         B14400: Final[int]
         B28800: Final[int]
         B7200: Final[int]
         B76800: Final[int]
+
+    if sys.platform == "darwin" and sys.version_info >= (3, 13):
+        ALTWERASE: Final[int]
         CCAR_OFLOW: Final[int]
         CCTS_OFLOW: Final[int]
         CDSR_OFLOW: Final[int]
@@ -274,6 +276,8 @@ if sys.platform != "win32":
         B460800: Final[int]
         B500000: Final[int]
         B921600: Final[int]
+        # On Linux, only available when Python was built against glibc 2.42 or newer.
+        IBSHIFT: Final[int]
 
     if sys.platform != "linux":
         TCSASOFT: Final[int]
@@ -286,7 +290,6 @@ if sys.platform != "win32":
         CNUL: Final[int]
         COMMON: Final[int]
         CSWTCH: Final[int]
-        IBSHIFT: Final[int]
         INIT_C_CC: Final[int]
         NSWTCH: Final[int]