Reported

November 16, 2021

Issued

November 17, 2021 (last modified: June 13, 2023)

Package

tokio (crates.io)

Type

Vulnerability

Categories

• memory-corruption
• thread-safety

Keywords

#race-condition

Aliases

• CVE-2021-45710
• GHSA-fg7r-2g4j-5cgr

References

• https://github.com/tokio-rs/tokio/issues/4225

Patched

• >=1.8.4, <1.9.0
• >=1.13.1

Unaffected

• <0.1.14

Affected Functions

Version

tokio::sync::oneshot::Receiver::close

• <=1.13.0, >=0.1.14

Description

If a tokio::sync::oneshot channel is closed (via the oneshot::Receiver::close method), a data race may occur if the oneshot::Sender::send method is called while the corresponding oneshot::Receiver is awaited or calling try_recv.

When these methods are called concurrently on a closed channel, the two halves of the channel can concurrently access a shared memory location, resulting in a data race. This has been observed to cause memory corruption.

Note that the race only occurs when both halves of the channel are used after the Receiver half has called close. Code where close is not used, or where the Receiver is not awaited and try_recv is not called after calling close, is not affected.

See tokio#4225 for more details.

Advisory available under CC0-1.0 license.