GHSA-5wjr-9356-4wc8 Tokio: Race condition in `tokio::time::Interval`

• crates.io tokio: >= 1.54.0, < 1.54.1 → fixed in 1.54.1

Summary On the multi-threaded runtime, there is a race condition between `Interval::poll_tick` and the runtime's time driver. This affects `Interval` only. `Sleep` and `Timeout` are not affected. Details In Tokio v1.54.0, a race condition between `tokio::time::Interval::poll_tick` (including `.tick().await`) and the runtime time driver can drop an internal timer entry without synchronizing with the driver thread that is firing it. This causes a data race and use-after-free on the timer's waker and task state in safe Rust, leading to assertion panics, task reference-count corruption, or heap memory corruption. This bug was introduced by https://github.com/tokio-rs/tokio/pull/8458, and it was fixed by https://github.com/tokio-rs/tokio/pull/8692. Impact This may lead to crashes and use-after-frees in applications using `Interval` on a multi-threaded runtime. Since this issue is known to lead to crashes in production systems, the v1.54.0 release of Tokio has been yanked. Credits Thank you to creepycode and carabistouille for reporting this privately using the procedure outlined in our security policy. They both reported the issue independently of each other.