CVE-2021-47389

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Per AMD's SEV API, RECEIVE_START generates a new guest\ncontext and thus needs to be paired with DECOMMISSION:\n\n The RECEIVE_START command is the only command other than the LAUNCH_START\n command that generates a new guest context and guest handle.\n\nThe missing DECOMMISSION can result in subsequent SEV launch failures,\nas the firmware leaks memory and might not able to allocate more SEV\nguest contexts in the future.\n\nNote, LAUNCH_START suffered the same bug, but was previously fixed by\ncommit 934002cd660b (\"KVM: SVM: Call SEV Guest Decommission if ASID\nbinding fails\")."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/svm/sev.c"], "versions": [{"version": "af43cbbf954b50ca97d5e7bb56c2edc6ffd209ef", "lessThan": "efd7866e114dcb44f86d151e843f8276b7efbc67", "status": "affected", "versionType": "git"}, {"version": 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Per AMD's SEV API, RECEIVE_START generates a new guest\ncontext and thus needs to be paired with DECOMMISSION:\n\n The RECEIVE_START command is the only command other than the LAUNCH_START\n command that generates a new guest context and guest handle.\n\nThe missing DECOMMISSION can result in subsequent SEV launch failures,\nas the firmware leaks memory and might not able to allocate more SEV\nguest contexts in the future.\n\nNote, LAUNCH_START suffered the same bug, but was previously fixed by\ncommit 934002cd660b (\"KVM: SVM: Call SEV Guest Decommission if ASID\nbinding fails\")."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.10", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15", "versionStartIncluding": "5.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:09:58.595Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47389", "state": "PUBLISHED", "dateUpdated": "2025-05-04T07:09:58.595Z", "dateReserved": "2024-05-21T14:58:30.813Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:03:48.216Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

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Per AMD's SEV API, RECEIVE_START generates a new guest\ncontext and thus needs to be paired with DECOMMISSION:\n\n The RECEIVE_START command is the only command other than the LAUNCH_START\n command that generates a new guest context and guest handle.\n\nThe missing DECOMMISSION can result in subsequent SEV launch failures,\nas the firmware leaks memory and might not able to allocate more SEV\nguest contexts in the future.\n\nNote, LAUNCH_START suffered the same bug, but was previously fixed by\ncommit 934002cd660b (\"KVM: SVM: Call SEV Guest Decommission if ASID\nbinding fails\")."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: SVM: corrige la falta de sev_decommission en sev_receive_start DESCOMMISSION el contexto SEV actual si falla la vinculaci\u00f3n de un ASID despu\u00e9s de RECEIVE_START. Seg\u00fan la API SEV de AMD, RECEIVE_START genera un nuevo contexto de invitado y, por lo tanto, debe combinarse con DECOMMISSION: el comando RECEIVE_START es el \u00fanico comando, adem\u00e1s del comando LAUNCH_START, que genera un nuevo contexto de invitado y un identificador de invitado. La DESCOMISI\u00d3N faltante puede provocar fallas de inicio de SEV posteriores, ya que el firmware pierde memoria y es posible que no pueda asignar m\u00e1s contextos de invitados de SEV en el futuro. Tenga en cuenta que LAUNCH_START sufri\u00f3 el mismo error, pero se solucion\u00f3 previamente mediante la confirmaci\u00f3n 934002cd660b (\"KVM: SVM: llame a SEV Guest Decommission si falla el enlace ASID\")."}], "id": "CVE-2021-47389", "lastModified": "2026-06-17T04:17:21.523", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 5.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 2.5, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47389", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-05T17:52:37.235226Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:24.330", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f1815e0aa770f2127c5df31eb5c2f0e37b60fa77"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f1815e0aa770f2127c5df31eb5c2f0e37b60fa77"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-772"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: KVM: SVM: fix missing sev_decommission in sev_receive_start", "id": "2282351", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282351"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: SVM: fix missing sev_decommission in sev_receive_start\nDECOMMISSION the current SEV context if binding an ASID fails after\nRECEIVE_START. Per AMD's SEV API, RECEIVE_START generates a new guest\ncontext and thus needs to be paired with DECOMMISSION:\nThe RECEIVE_START command is the only command other than the LAUNCH_START\ncommand that generates a new guest context and guest handle.\nThe missing DECOMMISSION can result in subsequent SEV launch failures,\nas the firmware leaks memory and might not able to allocate more SEV\nguest contexts in the future.\nNote, LAUNCH_START suffered the same bug, but was previously fixed by\ncommit 934002cd660b (\"KVM: SVM: Call SEV Guest Decommission if ASID\nbinding fails\")."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47389", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47389\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47389\nhttps://lore.kernel.org/linux-cve-announce/2024052145-CVE-2021-47389-c01c@gregkh/T"], "statement": "This vulnerability is rated as a moderate because it does not directly allow unauthorized access or privilege escalation, it can cause significant disruptions in virtualized environments by exhausting SEV resources, which could lead to operational issues.", "threat_severity": "Moderate"}

{}