{"id":"CVE-2026-29646","aliases":["EUVD-2026-23958","GHSA-729m-5x6m-wwxv"],"status":"published","title":"In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a...","description":"In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a VS-mode guest write to the supervisor interrupt-enable CSR (sie) may be handled incorrectly and can influence machine-level interrupt enable state (mie). This breaks privilege/virtualization isolation and can lead to denial of service or privilege-boundary violation in environments relying on NEMU for correct interrupt virtualization.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-09","score":0.00365,"percentile":0.30572,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-267"],"published":"2026-04-20T00:00:00Z","modified":"2026-06-17T10:29:50Z","references":[{"url":"https://docs.riscv.org/reference/isa/priv/machine.html"},{"url":"https://github.com/OpenXiangShan/NEMU/issues/951"},{"url":"https://github.com/OpenXiangShan/NEMU/pull/938"},{"url":"https://github.com/OpenXiangShan/NEMU/pull/938/commits/55295c46580456d8d5a9d5736e1fda924b8825ab"},{"url":"https://docs.riscv.org/reference/isa/unpriv/zicsr.html"},{"url":"https://docs.riscv.org/reference/isa/priv/supervisor.html"},{"url":"https://docs.riscv.org/reference/isa/priv/hypervisor.html"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29646"},{"url":"https://github.com/advisories/GHSA-729m-5x6m-wwxv"}],"sources":{"cve":[{"id":"CVE-2026-29646","description":"In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a VS-mode guest write to the supervisor interrupt-enable CSR (sie) may be handled incorrectly and can influence machine-level interrupt enable state (mie). This breaks privilege/virtualization isolation and can lead to denial of service or privilege-boundary violation in environments relying on NEMU for correct interrupt virtualization.","status":"published","published":"2026-04-20T00:00:00Z","modified":"2026-04-21T19:50:49.314Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-267"],"updated_at":"2026-11-02T14:19:56.284359Z"}],"euvd":[{"id":"EUVD-2026-23958","description":"In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a VS-mode guest write to the supervisor interrupt-enable CSR (sie) may be handled incorrectly and can influence machine-level interrupt enable state (mie). This breaks privilege/virtualization isolation and can lead to denial of service or privilege-boundary violation in environments relying on NEMU for correct interrupt virtualization.","status":"published","published":"2026-04-20T00:00:00Z","modified":"2026-04-21T19:50:49Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T19:24:21.512647Z"}],"ghsa":[{"id":"GHSA-729m-5x6m-wwxv","title":"In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a...","description":"In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a VS-mode guest write to the supervisor interrupt-enable CSR (sie) may be handled incorrectly and can influence machine-level interrupt enable state (mie). This breaks privilege/virtualization isolation and can lead to denial of service or privilege-boundary violation in environments relying on NEMU for correct interrupt virtualization.","status":"published","published":"2026-04-20T21:31:45Z","modified":"2026-04-21T21:31:21Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-267"],"updated_at":"2026-11-02T15:07:33.597532Z"}],"nvd":[{"id":"CVE-2026-29646","description":"In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a VS-mode guest write to the supervisor interrupt-enable CSR (sie) may be handled incorrectly and can influence machine-level interrupt enable state (mie). This breaks privilege/virtualization isolation and can lead to denial of service or privilege-boundary violation in environments relying on NEMU for correct interrupt virtualization.","status":"published","published":"2026-04-20T21:16:19.503Z","modified":"2026-06-17T10:29:50.74Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-267"],"updated_at":"2026-11-02T14:12:15.120927Z"}]}}