CVE-2026-99093 mm: don't schedule deferred kernel page table freeing while booting

In the Linux kernel, the following vulnerability has been resolved: mm: don't schedule deferred kernel page table freeing while booting Booting with a boot-time function tracer and a filter, for example ftrace=function ftracefilter=pudfreepmdpage panics on 7.3-rc4 as soon as the tracer starts:...

CVE-2026-99093

The Linux kernel is vulnerable to a kernel panic during boot when using a boot-time function tracer with a filter (e.g., ftrace=function ftrace_filter=pud_free_pmd_page). The issue arises because early_trace_init() runs before workqueue_init_early(). When a large page is split and subsequently co...