CVE-2026-29646
Privilege escalation/DoS in OpenXiangShan NEMU RVH mode due to sie handling bug
Is CVE-2026-29646 being exploited?
Not confirmed. CVE-2026-29646 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-29646?
CVE-2026-29646 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-29646?
Not known from our data. No patch reference has been recorded for CVE-2026-29646, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-29646 affect?
CVE-2026-29646 affects OpenXiangShan NEMU. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-29646?
Patch/upgrade to fixed NEMU build when released
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Guest VS-mode write to sie can influence mie, breaking privilege/virtualization isolation and enabling privilege escalation or DoS.
Patch when possible