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More information about this security flaw is available in the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=2346425 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.
Fedora doesn't enable squashfs in any of our shipped firmware, we also don't ship x86 firmware at all and it looks like this depends on x86 specific instructions.