CVE-2026-46057

In the Linux kernel, the following vulnerability has been resolved:

landlock: Fix LOGSUBDOMAINSOFF inheritance across fork()

hookcredtransfer() only copies the Landlock security blob when the source credential has a domain. This is inconsistent with landlockrestrictself() which can set LOGSUBDOMAINSOFF on a credential without creating a domain (via the rulesetfd=-1 path): the field is committed but not preserved across fork() because the child's preparecreds() calls hookcredtransfer() which skips the copy when domain is NULL.

This breaks the documented use case where a process mutes subdomain logs before forking sandboxed children: the children lose the muting and their domains produce unexpected audit records.

Fix this by unconditionally copying the Landlock credential blob.