Reported

June 26, 2020

Issued

October 11, 2020 (last modified: June 13, 2023)

Package

crossbeam-channel (crates.io)

Type

Vulnerability

Categories

• memory-corruption

Aliases

• CVE-2020-15254
• CVE-2020-35904
• GHSA-m8h8-v6jh-c762
• GHSA-v5m7-53cv-f3hx

References

• https://github.com/crossbeam-rs/crossbeam/pull/533

Patched

• >=0.4.4

Unaffected

• <0.4.3

Description

The affected version of this crate's the bounded channel incorrectly assumes that Vec::from_iter has allocated capacity that same as the number of iterator elements. Vec::from_iter does not actually guarantee that and may allocate extra memory. The destructor of the bounded channel reconstructs Vec from the raw pointer based on the incorrect assumes described above. This is unsound and causing deallocation with the incorrect capacity when Vec::from_iter has allocated different sizes with the number of iterator elements.

Advisory available under CC0-1.0 license.