diff --git a/library/core/src/io/mod.rs b/library/core/src/io/mod.rs
index a44d271535a9e..37edf0a1082df 100644
--- a/library/core/src/io/mod.rs
+++ b/library/core/src/io/mod.rs
@@ -23,8 +23,6 @@ pub use self::error::const_error;
 #[unstable(feature = "core_io", issue = "154046")]
 pub use self::{
     cursor::Cursor,
-    error::{Error, ErrorKind, Result},
-    io_slice::{IoSlice, IoSliceMut},
     seek::{Seek, SeekFrom},
     util::{Chain, Empty, Repeat, Sink, Take, empty, repeat, sink},
     write::Write,
@@ -42,6 +40,11 @@ pub use self::{
     util::{chain, take},
     write::default_write_vectored,
 };
+#[stable(feature = "core_io_fundamentals", since = "CURRENT_RUSTC_VERSION")]
+pub use self::{
+    error::{Error, ErrorKind, Result},
+    io_slice::{IoSlice, IoSliceMut},
+};
 
 /// Marks that a type `T` can have IO traits such as [`Seek`], [`Write`], etc. automatically
 /// implemented for handle types like [`Arc`][arc] as well.
diff --git a/library/core/src/lib.rs b/library/core/src/lib.rs
index 8a592fce7dfcd..63aa1f349e9dd 100644
--- a/library/core/src/lib.rs
+++ b/library/core/src/lib.rs
@@ -293,7 +293,7 @@ pub mod bstr;
 pub mod cell;
 pub mod char;
 pub mod ffi;
-#[unstable(feature = "core_io", issue = "154046")]
+#[stable(feature = "core_io_fundamentals", since = "CURRENT_RUSTC_VERSION")]
 pub mod io;
 pub mod iter;
 pub mod net;
diff --git a/library/coretests/tests/lib.rs b/library/coretests/tests/lib.rs
index 35327264ccd77..1c19218f6df5c 100644
--- a/library/coretests/tests/lib.rs
+++ b/library/coretests/tests/lib.rs
@@ -37,7 +37,6 @@
 #![feature(const_unsigned_bigint_helpers)]
 #![feature(core_intrinsics)]
 #![feature(core_intrinsics_fallbacks)]
-#![feature(core_io)]
 #![feature(core_io_borrowed_buf)]
 #![feature(core_private_bignum)]
 #![feature(core_private_diy_float)]
diff --git a/tests/ui/feature-gates/feature-gate-io_error_kind_in_core.rs b/tests/ui/feature-gates/feature-gate-io_error_kind_in_core.rs
deleted file mode 100644
index 514e4e1277afa..0000000000000
--- a/tests/ui/feature-gates/feature-gate-io_error_kind_in_core.rs
+++ /dev/null
@@ -1,12 +0,0 @@
-// Ensure `ErrorKind` from `core` is gated behind `core_io`
-//@ edition:2024
-
-use std::io::ErrorKind as ErrorKindFromStd;
-
-use core::io::ErrorKind as ErrorKindFromCore;
-//~^ ERROR use of unstable library feature `core_io`
-
-// Asserting both ErrorKinds are the same.
-const _: [ErrorKindFromCore; 1] = [ErrorKindFromStd::Other];
-
-fn main() {}
diff --git a/tests/ui/feature-gates/feature-gate-io_error_kind_in_core.stderr b/tests/ui/feature-gates/feature-gate-io_error_kind_in_core.stderr
deleted file mode 100644
index edc316cc475e6..0000000000000
--- a/tests/ui/feature-gates/feature-gate-io_error_kind_in_core.stderr
+++ /dev/null
@@ -1,13 +0,0 @@
-error[E0658]: use of unstable library feature `core_io`
-  --> $DIR/feature-gate-io_error_kind_in_core.rs:6:11
-   |
-LL | use core::io::ErrorKind as ErrorKindFromCore;
-   |           ^^
-   |
-   = note: see issue #154046 <https://github.com/rust-lang/rust/issues/154046> for more information
-   = help: add `#![feature(core_io)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0658`.