{"id":"CVE-2026-29642","aliases":["EUVD-2026-23954","GHSA-9m35-v5wh-m3xw"],"status":"published","title":"A local attacker who can execute privileged CSR operations (or can induce firmware to do so)...","description":"A local attacker who can execute privileged CSR operations (or can induce firmware to do so) performs carefully crafted reads/writes to menvcfg (e.g., csrrs in M-mode). On affected XiangShan versions (commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19), these menvcfg accesses can unexpectedly set WPRI (reserved) bits in the status view (xstatus) to 1. RISC-V defines WPRI fields as \"writes preserve values, reads ignore values,\" i.e., they must not be modified by software manipulating other fields, and menvcfg itself contains multiple WPRI fields.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-09","score":0.00112,"percentile":0.0136,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1244"],"published":"2026-04-20T00:00:00Z","modified":"2026-10-28T02:30:29Z","references":[{"url":"https://github.com/OpenXiangShan/XiangShan/issues/3934","tags":["report"]},{"url":"https://github.com/OpenXiangShan/XiangShan/commit/5e3dd63","tags":["fix"]},{"url":"https://docs.riscv.org/reference/isa/priv/priv-csrs.html","tags":["web"]},{"url":"https://docs.riscv.org/reference/isa/priv/machine.html","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29642","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9m35-v5wh-m3xw"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29642.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-29642","description":"A local attacker who can execute privileged CSR operations (or can induce firmware to do so) performs carefully crafted reads/writes to menvcfg (e.g., csrrs in M-mode). On affected XiangShan versions (commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19), these menvcfg accesses can unexpectedly set WPRI (reserved) bits in the status view (xstatus) to 1. RISC-V defines WPRI fields as \"writes preserve values, reads ignore values,\" i.e., they must not be modified by software manipulating other fields, and menvcfg itself contains multiple WPRI fields.","status":"published","published":"2026-04-20T00:00:00Z","modified":"2026-04-21T19:50:54.758Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-1244"],"updated_at":"2026-11-02T14:19:56.284359Z"}],"euvd":[{"id":"EUVD-2026-23954","description":"A local attacker who can execute privileged CSR operations (or can induce firmware to do so) performs carefully crafted reads/writes to menvcfg (e.g., csrrs in M-mode). On affected XiangShan versions (commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19), these menvcfg accesses can unexpectedly set WPRI (reserved) bits in the status view (xstatus) to 1. RISC-V defines WPRI fields as \"writes preserve values, reads ignore values,\" i.e., they must not be modified by software manipulating other fields, and menvcfg itself contains multiple WPRI fields.","status":"published","published":"2026-04-20T00:00:00Z","modified":"2026-04-21T19:50:54Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T19:24:21.512647Z"}],"ghsa":[{"id":"GHSA-9m35-v5wh-m3xw","title":"A local attacker who can execute privileged CSR operations (or can induce firmware to do so)...","description":"A local attacker who can execute privileged CSR operations (or can induce firmware to do so) performs carefully crafted reads/writes to menvcfg (e.g., csrrs in M-mode). On affected XiangShan versions (commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19), these menvcfg accesses can unexpectedly set WPRI (reserved) bits in the status view (xstatus) to 1. RISC-V defines WPRI fields as \"writes preserve values, reads ignore values,\" i.e., they must not be modified by software manipulating other fields, and menvcfg itself contains multiple WPRI fields.","status":"published","published":"2026-04-20T21:31:45Z","modified":"2026-04-21T21:31:21Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-1244"],"updated_at":"2026-11-02T15:07:33.597532Z"}],"nvd":[{"id":"CVE-2026-29642","description":"A local attacker who can execute privileged CSR operations (or can induce firmware to do so) performs carefully crafted reads/writes to menvcfg (e.g., csrrs in M-mode). On affected XiangShan versions (commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19), these menvcfg accesses can unexpectedly set WPRI (reserved) bits in the status view (xstatus) to 1. RISC-V defines WPRI fields as \"writes preserve values, reads ignore values,\" i.e., they must not be modified by software manipulating other fields, and menvcfg itself contains multiple WPRI fields.","status":"published","published":"2026-04-20T21:16:19.393Z","modified":"2026-06-17T10:29:50.15Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-1244"],"updated_at":"2026-11-02T14:12:15.120927Z"}],"osv":[{"id":"CVE-2026-29642","description":"A local attacker who can execute privileged CSR operations (or can induce firmware to do so) performs carefully crafted reads/writes to menvcfg (e.g., csrrs in M-mode). On affected XiangShan versions (commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19), these menvcfg accesses can unexpectedly set WPRI (reserved) bits in the status view (xstatus) to 1. RISC-V defines WPRI fields as \"writes preserve values, reads ignore values,\" i.e., they must not be modified by software manipulating other fields, and menvcfg itself contains multiple WPRI fields.","status":"published","published":"2026-04-20T00:00:00Z","modified":"2026-10-28T02:30:29.375232339Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:00.530889Z"}]}}