CVE-2026-29643
HighSummary
W procesorze XiangShan (otwartoźródłowy procesor RISC-V) występuje błąd w obsłudze wyjątkowych warunków w subsystemie CSR (NewCSR). W dotkniętych wersjach, niektóre sekwencje operacji CSR mogą wywołać wyjątek nielegalnej instrukcji, nieprzekazując kontrolnie do skonfigurowanego handlera pułapek, co prowadzi do zakłócenia przepływu kontroli.
Risk Assessment
Atakujący lokalny, który ma możliwość wykonywania kodu na procesorze, może wykorzystać tę podatność do wywołania odmowy usługi oraz potencjalnie wprowadzić niespójny stan architektoniczny, co może prowadzić do poważnych problemów operacyjnych w organizacji.
Recommendation
Zaleca się aktualizację do najnowszej wersji oprogramowania procesora XiangShan, aby usunąć tę podatność oraz monitorowanie systemów w celu wykrycia potencjalnych prób wykorzystania tej luki.
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Original NVD description (English source)
XiangShan (Open-source high-performance RISC-V processor) commit edb1dfaf7d290ae99724594507dc46c2c2125384 (2024-11-28) contains an improper exceptional-condition handling flaw in its CSR subsystem (NewCSR). On affected versions, certain sequences of CSR operations targeting non-existent/custom CSR addresses may trigger an illegal-instruction exception but fail to reliably transfer control to the configured trap handler (mtvec), causing control-flow disruption and potentially leaving the core in a hung or unrecoverable state. This can be exploited by a local attacker able to execute code on the processor to cause a denial of service and potentially inconsistent architectural state.