CVE-2021-38191: Race condition in tokio

August 25, 2021 (updated June 13, 2023)

When aborting a task with JoinHandle::abort, the future is dropped in the thread calling abort if the task is not currently being executed. This is incorrect for tasks spawned on a LocalSet. This can easily result in race conditions as many projects use Rc or RefCell in their Tokio tasks for better performance.

References

github.com/advisories/GHSA-2grh-hm3w-w7hv
github.com/tokio-rs/tokio
github.com/tokio-rs/tokio/issues/3929
nvd.nist.gov/vuln/detail/CVE-2021-38191
raw.githubusercontent.com/rustsec/advisory-db/main/crates/tokio/RUSTSEC-2021-0072.md
rustsec.org/advisories/RUSTSEC-2021-0072.html

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