CVE-2022-23639: Improper Restriction of Operations within the Bounds of a Memory Buffer and Race Condition in crossbeam-utils
Impact
The affected versions of this crate incorrectly assumed that the alignment of {i,u}64 was always the same as Atomic{I,U}64.
However, the alignment of {i,u}64 on a 32-bit target can be smaller than Atomic{I,U}64.
This can cause the following problems:
- Unaligned memory accesses - Data race
Crates using fetch methods with AtomicCell<{i,u}64> are affected by this issue.
32-bit targets without Atomic{I,U}64 and 64-bit targets are not affected by this issue. 32-bit targets with Atomic{I,U}64 and {i,u}64 have the same alignment are also not affected by this issue.
The following is a complete list of the builtin targets that may be affected. (last update: nightly-2022-02-11)
- armv7-apple-ios (tier 3) - armv7s-apple-ios (tier 3) - i386-apple-ios (tier 3) - i586-unknown-linux-gnu - i586-unknown-linux-musl - i686-apple-darwin (tier 3) - i686-linux-android - i686-unknown-freebsd - i686-unknown-haiku (tier 3) - i686-unknown-linux-gnu - i686-unknown-linux-musl - i686-unknown-netbsd (tier 3) - i686-unknown-openbsd (tier 3) - i686-wrs-vxworks (tier 3)
(script to get list)
Patches
This has been fixed in crossbeam-utils 0.8.7.
Affected 0.8.x releases have been yanked.
References
https://github.com/crossbeam-rs/crossbeam/pull/781
License
This advisory is in the public domain.
Other sources
crossbeam-utils provides atomics, synchronization primitives, scoped threads, and other utilities for concurrent programming in Rust. crossbeam-utils prior to version 0.8.7 incorrectly assumed that the alignment of {i,u}64 was always the same as Atomic{I,U}64. However, the alignment of {i,u}64 on a 32-bit target can be smaller than Atomic{I,U}64. This can cause unaligned memory accesses and data race. Crates using fetch methods with AtomicCell<{i,u}64> are affected by this issue. 32-bit targets without Atomic{I,U}64 and 64-bit targets are not affected by this issue. This has been fixed in crossbeam-utils 0.8.7. There are currently no known workarounds.
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is CVE-2022-23639?
CVE-2022-23639 is a vulnerability in the crossbeam-utils library that provides atomics, synchronization primitives, scoped threads, and other utilities for concurrent programming in Rust.
What is the severity of CVE-2022-23639?
The severity of CVE-2022-23639 is high, with a severity value of 8.1.
What is the affected software for CVE-2022-23639?
The affected software is Crossbeam Project Crossbeam, specifically versions up to 0.8.7.
What is the fix for CVE-2022-23639?
To fix CVE-2022-23639, update to version 0.8.7 of the crossbeam-utils library.
What is the CWE ID for CVE-2022-23639?
The CWE ID for CVE-2022-23639 is CWE-362.