{"cve":"CVE-2021-26340","nvd":{"published":"2021-12-10T22:15:08.323","modified":"2026-06-17T03:43:10.617","status":"Modified","description":"A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to flush the Translation Lookaside Buffer (TLB) resulting in unexpected behavior inside the virtual machine (VM).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","score":8.4},"cwes":[],"references":["https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1023","https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1023"],"products":["amd:epyc_7001_firmware","amd:epyc_7232p_firmware","amd:epyc_7251_firmware","amd:epyc_7252_firmware","amd:epyc_7261_firmware","amd:epyc_7262_firmware","amd:epyc_7272_firmware","amd:epyc_7281_firmware","amd:epyc_7282_firmware","amd:epyc_72f3_firmware","amd:epyc_7301_firmware","amd:epyc_7302_firmware","amd:epyc_7302p_firmware","amd:epyc_7313_firmware","amd:epyc_7313p_firmware","amd:epyc_7343_firmware","amd:epyc_7351_firmware","amd:epyc_7351p_firmware","amd:epyc_7352_firmware","amd:epyc_7371_firmware","amd:epyc_73f3_firmware","amd:epyc_7401_firmware","amd:epyc_7401p_firmware","amd:epyc_7402_firmware","amd:epyc_7402p_firmware","amd:epyc_7413_firmware","amd:epyc_7443_firmware","amd:epyc_7443p_firmware","amd:epyc_7451_firmware","amd:epyc_7452_firmware","amd:epyc_7453_firmware","amd:epyc_74f3_firmware","amd:epyc_7501_firmware","amd:epyc_7502_firmware","amd:epyc_7502p_firmware","amd:epyc_7513_firmware","amd:epyc_7532_firmware","amd:epyc_7542_firmware","amd:epyc_7543_firmware","amd:epyc_7543p_firmware","amd:epyc_7551_firmware","amd:epyc_7551p_firmware","amd:epyc_7552_firmware","amd:epyc_75f3_firmware","amd:epyc_7601_firmware","amd:epyc_7642_firmware","amd:epyc_7643_firmware","amd:epyc_7662_firmware","amd:epyc_7663_firmware","amd:epyc_7702_firmware"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-26340","score":0.00247,"percentile":0.16066,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}