diff --git a/toolchain/gcc/patches-14.x/240-libsanitizer-fix-termio-glibc-2.40.patch b/toolchain/gcc/patches-14.x/240-libsanitizer-fix-termio-glibc-2.40.patch
new file mode 100644
index 0000000000..b2ceac73ce
--- /dev/null
+++ b/toolchain/gcc/patches-14.x/240-libsanitizer-fix-termio-glibc-2.40.patch
@@ -0,0 +1,53 @@
+From: Backport from GCC 15
+
+libsanitizer: remove struct termio and legacy ioctl interceptors for glibc
+
+glibc 2.43 no longer exposes struct termio (the old UNIX System V
+terminal struct) through <termios.h>. The old TCGETA/TCSETA/TCSETAF/
+TCSETAW ioctls that operated on struct termio are legacy interfaces
+superseded by the POSIX TCGETS/TCSETS family using struct termios.
+
+GCC 15 already dropped these; this patch backports that removal to GCC 14.
+
+--- a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cpp
++++ b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cpp
+@@ -479,9 +479,6 @@
+   unsigned struct_input_id_sz = sizeof(struct input_id);
+   unsigned struct_mtpos_sz = sizeof(struct mtpos);
+   unsigned struct_rtentry_sz = sizeof(struct rtentry);
+-#if SANITIZER_GLIBC || SANITIZER_ANDROID
+-  unsigned struct_termio_sz = sizeof(struct termio);
+-#endif
+   unsigned struct_vt_consize_sz = sizeof(struct vt_consize);
+   unsigned struct_vt_sizes_sz = sizeof(struct vt_sizes);
+   unsigned struct_vt_stat_sz = sizeof(struct vt_stat);
+--- a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
++++ b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
+@@ -1012,7 +1012,6 @@
+ extern unsigned struct_input_absinfo_sz;
+ extern unsigned struct_input_id_sz;
+ extern unsigned struct_mtpos_sz;
+-extern unsigned struct_termio_sz;
+ extern unsigned struct_vt_consize_sz;
+ extern unsigned struct_vt_sizes_sz;
+ extern unsigned struct_vt_stat_sz;
+--- a/libsanitizer/sanitizer_common/sanitizer_common_interceptors_ioctl.inc
++++ b/libsanitizer/sanitizer_common/sanitizer_common_interceptors_ioctl.inc
+@@ -338,17 +338,9 @@
+   _(SOUND_PCM_WRITE_CHANNELS, WRITE, sizeof(int));
+   _(SOUND_PCM_WRITE_FILTER, WRITE, sizeof(int));
+   _(TCFLSH, NONE, 0);
+-#if SANITIZER_GLIBC
+-  _(TCGETA, WRITE, struct_termio_sz);
+-#endif
+   _(TCGETS, WRITE, struct_termios_sz);
+   _(TCSBRK, NONE, 0);
+   _(TCSBRKP, NONE, 0);
+-#if SANITIZER_GLIBC
+-  _(TCSETA, READ, struct_termio_sz);
+-  _(TCSETAF, READ, struct_termio_sz);
+-  _(TCSETAW, READ, struct_termio_sz);
+-#endif
+   _(TCSETS, READ, struct_termios_sz);
+   _(TCSETSF, READ, struct_termios_sz);
+   _(TCSETSW, READ, struct_termios_sz);