https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Fri, 02 Oct 2026 15:09:31 +0000 https://vulnerability.circl.lu/vuln/cve-2026-43258 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>alpha: fix user-space corruption during memory compaction</p> <p>Alpha systems can suffer sporadic user-space crashes and heap corruption when memory compaction is enabled.</p> <p>Symptoms include SIGSEGV, glibc allocator failures (e.g. &#34;unaligned tcache chunk&#34;), and compiler internal errors. The failures disappear when compaction is disabled or when using global TLB invalidation.</p> <p>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.</p> <p>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.</p> <p>The helper is used only by migration/compaction paths to avoid changing global TLB semantics.</p> <p>Additionally, update flush_tlb_other(), pte_clear(), to use READ_ONCE()/WRITE_ONCE() for correct SMP memory ordering.</p> <p>This fixes observed crashes on both UP and SMP Alpha systems.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>alpha: fix user-space corruption during memory compaction</p> <p>Alpha systems can suffer sporadic user-space crashes and heap corruption when memory compaction is enabled.</p> <p>Symptoms include SIGSEGV, glibc allocator failures (e.g. &#34;unaligned tcache chunk&#34;), and compiler internal errors. The failures disappear when compaction is disabled or when using global TLB invalidation.</p> <p>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.</p> <p>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.</p> <p>The helper is used only by migration/compaction paths to avoid changing global TLB semantics.</p> <p>Additionally, update flush_tlb_other(), pte_clear(), to use READ_ONCE()/WRITE_ONCE() for correct SMP memory ordering.</p> <p>This fixes observed crashes on both UP and SMP Alpha systems.</p> https://vulnerability.circl.lu/vuln/cve-2026-43258