CVE-2026-98399 s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block

In the Linux kernel, the following vulnerability has been resolved: s390/ipl: Fix NULL deref in dumpreipl without re-IPL parm block Unlike kdump, which passes the re-IPL parameter block through osinfo, the stand-alone dump passes it through the IPL parm block address and checksum in lowcore. Some...