Bug 2366570

Summary: CVE-2025-4574 ruby: crossbeam-channel Vulnerable to Double Free on Drop [fedora-42]
Product: [Fedora] Fedora Reporter: Michal Findra <mfindra>
Component: rubyAssignee: Vít Ondruch <vondruch>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: 42CC: jprokop, mtasaka, pvalena, ruby-packagers-sig, vondruch
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["62aa5787-67fa-449e-acc0-a6f259c58c81"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2025-05-16 09:29:15 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2358890    

Description Michal Findra 2025-05-15 14:35:54 UTC 
More information about this security flaw is available in the following bug:

https://bugzilla.redhat.com/show_bug.cgi?id=2358890

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Comment 1 Vít Ondruch 2025-05-15 18:03:07 UTC 
~~~
$ grep -R crossbeam
gc/mmtk/Cargo.lock:name = "crossbeam"
gc/mmtk/Cargo.lock: "crossbeam-channel",
gc/mmtk/Cargo.lock: "crossbeam-deque",
gc/mmtk/Cargo.lock: "crossbeam-epoch",
gc/mmtk/Cargo.lock: "crossbeam-queue",
gc/mmtk/Cargo.lock: "crossbeam-utils",
gc/mmtk/Cargo.lock:name = "crossbeam-channel"
gc/mmtk/Cargo.lock: "crossbeam-utils",
gc/mmtk/Cargo.lock:name = "crossbeam-deque"
gc/mmtk/Cargo.lock: "crossbeam-epoch",
gc/mmtk/Cargo.lock: "crossbeam-utils",
gc/mmtk/Cargo.lock:name = "crossbeam-epoch"
gc/mmtk/Cargo.lock: "crossbeam-utils",
gc/mmtk/Cargo.lock:name = "crossbeam-queue"
gc/mmtk/Cargo.lock: "crossbeam-utils",
gc/mmtk/Cargo.lock:name = "crossbeam-utils"
gc/mmtk/Cargo.lock: "crossbeam",
gc/mmtk/Cargo.lock: "crossbeam-deque",
gc/mmtk/Cargo.lock: "crossbeam-utils",
~~~

I wonder if and how this could affect Ruby 🤔
Comment 2 Vít Ondruch 2025-05-16 09:29:15 UTC 
So according to the README [1], the modular GC API would need to be first enabled by configuration option. Which is not, also confirmed in build.log [1] where there is `checking if building with modular GC support... no`. And if the modular GC was enabled, then the `mmtk` would need to be selected instead of the `default`, which obviously is not the case given the former. Therefore closing this as a NOTABUG.



[1]: https://github.com/ruby/ruby/blob/master/gc/README.md
[2]: https://kojipkgs.fedoraproject.org//packages/ruby/3.4.2/24.fc43/data/logs/x86_64/build.log