[renovate]

This PR contains the following updates:

Package	Type	Update	Change
tokio (source)	workspace.dependencies	minor	1.52.1 → 1.53.3

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AsyncFd::new and related constructors violate I/O safety

RUSTSEC-2026-0386

More information

Details

tokio::io::unix::AsyncFd provides safe constructors (new, with_interest, try_new, and try_with_interest) that accept any T: AsRawFd rather than requiring proof of ownership or validity of the file descriptor. Because RawFd implements AsRawFd, safe code can construct an AsyncFd from an arbitrary or closed file descriptor, or close/replace the underlying file descriptor while the AsyncFd is still alive.

This violates I/O safety in two ways:

1. AsyncFd<T> implements AsFd for all T: AsRawFd by calling BorrowedFd::borrow_raw(self.as_raw_fd()), allowing safe code to obtain an arbitrary BorrowedFd<'_> without owning the file descriptor.
2. Tokio's I/O driver stores a pointer to an internal allocation in the epoll/kqueue user data for registered file descriptors. If the underlying file descriptor is duplicated and then closed while an AsyncFd is alive, and the OS reuses that file descriptor number for a another IO resource on the same runtime, dropping the first AsyncFd deregisters the reused file descriptor number and frees the first while the original file description remains registered in epoll, leading to a use-after-free when a readiness event fires.

Starting in Tokio 1.51.6, 1.53.3, and 1.54.0, AsyncFd::new, AsyncFd::with_interest, AsyncFd::try_new, and AsyncFd::try_with_interest are deprecated in favor of the unsafe constructors AsyncFd::register and AsyncFd::register_with_interest. Callers must ensure that the file descriptor remains valid, open, and unchanged for the lifetime of the AsyncFd.

Severity

Unknown

References

• https://crates.io/crates/tokio
• https://rustsec.org/advisories/RUSTSEC-2026-0386.html
• https://github.com/tokio-rs/tokio/pull/8587
• https://github.com/tokio-rs/tokio/issues/8538
• https://github.com/tokio-rs/tokio/issues/8539

This data is provided by OSV and the Rust Advisory Database (CC0 1.0).

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Release Notes

tokio-rs/tokio (tokio)

v1.53.3: Tokio v1.53.3

Compare Source

1.53.3 (October 13th, 2026)

Added

• io: add AsyncFd::register and AsyncFd::register_with_interest (#​8587)

Changed

• io: deprecate AsyncFd::{new, with_interest, try_new, try_with_interest} (#​8587)

Fixed

• io: wake and drop DuplexStream wakers outside the lock (#​8618)
• macros: avoid unreachable_code in join! and try_join! for Infallible (#​8518)
• runtime: fix paused time auto-advancing when I/O wakes a task on current_thread (#​8595)
• sync: wake waiters outside the lock when closing a semaphore (#​8529)
• test: fix several flaky tests (#​8196, #​8427, #​8609)

Fixed (unstable)

• rt: keep io_uring op alive when submission fails after push (#​8185)

v1.53.2: Tokio v1.53.2

Compare Source

1.53.2 (October 3rd, 2026)

Fixed

• fs: handle integer overflow in buffered relative seek (#​8574)
• io: revert "always cleanup AsyncFd registration list on deregister" (#​8540)
• process: unregister Windows wait before closing child handle (#​8564)
• rt: drop blocking pool mutex before shutting down rejected task (#​8562)
• sync: fix mpsc index wraparound in block reclamation (#​8546)
• sync: forget mpsc Permit before sending value (#​8560)
• sync: validate MAX_PERMITS in Semaphore::acquire (#​8548)
• sync: wake broadcast Sender::closed outside mutex (#​8558)
• task: drop replaced waker outside lock in JoinSet (#​8554)
• time: drop timer lock before dropping waker in clear_entry (#​8552)
• time: expire timers directly on shutdown without rotating wheel (#​8570)

Fixed (unstable)

• fs: clamp io_uring read length to u32::MAX (#​8572)
• rt: ignore current_thread task dumps from other runtimes (#​8544)
• rt: preserve io_uring context if a completion waker panics (#​8566)
• sync: fix semaphore use-after-free and permit leak on tracing panic (#​8542)
• taskdump: restore deferred leaf wakes during capture (#​8445)
• time: drop stored waker when cancelling alt timer entry (#​8550)

v1.53.1: Tokio v1.53.1

Compare Source

1.53.1 (July 20th, 2026)

Fixed

• signal: restore MSRV by removing OnceLock::wait from the Windows handler (#​8300)

Fixed (unstable)

• time: fix alt timer cancellation and insertion race (#​8252)

Documented

• runtime: remove dead link definition in Runtime::block_on (#​8301)

v1.53.0: Tokio v1.53.0

Compare Source

1.53.0 (July 17th, 2026)

Added

• fs: implement From<OwnedFd> and From<OwnedHandle> for File (#​8266)
• metrics: add task schedule latency metric (#​7986)
• net: add SocketAddr methods to Unix sockets (#​8144)

Changed

• io: add #[inline] to IO trait impls for in-memory types (#​8242)
• net: implement UCred::pid on FreeBSD (#​8086)
• net: support Nuttx target os (#​8259)
• signal: refactor global variables on Windows (#​8231)
• sync: mpsc::{Receiver,UnboundedReceiver} now drops waker on drop, even if there are still senders (#​8095)
• taskdump: support taskdumps on s390x (#​8192)
• time: add #[track_caller] to timeout_at() (#​8077)
• time: consolidate mutex locks on spurious poll (#​8124)
• time: defer waker clone on spurious poll (#​8107)
• time: move lazy-registration state into Sleep (#​8132)
• tracing: remove unnecessary span clone (#​8126)

Fixed

• io: do not treat zero-length reads as EOF in Chain (#​8251)
• net: use getpeereid for QNX peer credentials (#​8270)
• runtime: avoid illegal state in FastRand (#​8078)
• sync: wake mpsc receiver when a queued reserve[_many] returns permits (#​8260)
• taskdump: skip double wake on Trace::capture/Trace::trace_with (#​8043)
• time: avoid stack overflow in runtime constructor (#​8093)
• time (alt timer): ensure timers stay in the same runtime after .reset() (#​8169)

IO uring (unstable)

• fs: use io-uring for fs::try_exists (#​8080)
• fs: use io-uring for renaming files (#​7800)
• rt: flush io-uring CQE in case of CQE overflow (#​8277)

Documented

• docs: clarify cancel safety wording (#​8181)
• fs: clarify create_dir_all succeeds if path exists (#​8149)
• io: add warning about stdout reordering with multiple handles (#​8276)
• net: document pipe try_read*/try_write* readiness behavior (#​8032)
• runtime: document interaction with fork() (#​8202)
• sync: clarify broadcast lagging semantics (#​8239)
• sync: document memory ordering guarantees for Semaphore (#​8119)
• task: explain why yield_now defers its waker (#​8254)
• time: add panic docs to timeout_at() (#​8077)
• time: fix reversed poll order in timeout doc (#​8214)

v1.52.4: Tokio v1.52.4

Compare Source

1.52.4 (July 16th, 2026)

Fixed

• runtime: don't skip the driver when before_park schedules work (#​8222)

Fixed (unstable)

• taskdump: remove crate disambiguators from output (#​8264)

v1.52.3: Tokio v1.52.3

Compare Source

1.52.3 (May 8th, 2026)

Fixed

• sync: fix underflow in mpsc channel len() (#​8062)
• sync: notify receivers in mpsc OwnedPermit::release() method (#​8075)
• sync: require that an RwLock has max_readers != 0 (#​8076)
• sync: return Empty from try_recv() when mpsc is closed with outstanding permits (#​8074)

v1.52.2: Tokio v1.52.2

Compare Source

1.52.2 (May 4th, 2026)

This release reverts the LIFO slot stealing change introduced in 1.51.0 (#​7431), due to its performance impact. (#​8100)

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