CVE-2026-43258

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

alpha: fix user-space corruption during memory compaction

Alpha systems can suffer sporadic user-space crashes and heap

corruption when memory compaction is enabled.

Symptoms include SIGSEGV, glibc allocator failures (e.g. "unaligned

tcache chunk"), and compiler internal errors. The failures disappear

when compaction is disabled or when using global TLB invalidation.

The root cause is insufficient TLB shootdown during page migration.

Alpha relies on ASN-based MM context rollover for instruction cache

coherency, but this alone is not sufficient to prevent stale data or

instruction translations from surviving migration.

Fix this by introducing a migration-specific helper that combines:

- MM context invalidation (ASN rollover),

- immediate per-CPU TLB invalidation (TBI),

- synchronous cross-CPU shootdown when required.

The helper is used only by migration/compaction paths to avoid changing

global TLB semantics.

Additionally, update flush_tlb_other(), pte_clear(), to use

READ_ONCE()/WRITE_ONCE() for correct SMP memory ordering.

This fixes observed crashes on both UP and SMP Alpha systems.