CVE-2021-47389 (GCVE-0-2021-47389)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-05-11 13:53
VLAI
Title
KVM: SVM: fix missing sev_decommission in sev_receive_start
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: fix missing sev_decommission in sev_receive_start DECOMMISSION the current SEV context if binding an ASID fails after RECEIVE_START. Per AMD's SEV API, RECEIVE_START generates a new guest context and thus needs to be paired with DECOMMISSION: The RECEIVE_START command is the only command other than the LAUNCH_START command that generates a new guest context and guest handle. The missing DECOMMISSION can result in subsequent SEV launch failures, as the firmware leaks memory and might not able to allocate more SEV guest contexts in the future. Note, LAUNCH_START suffered the same bug, but was previously fixed by commit 934002cd660b ("KVM: SVM: Call SEV Guest Decommission if ASID binding fails").
Severity
5.1 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-05 17:52 UTC
CWE
  • CWE-772 - Missing Release of Resource after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: af43cbbf954b50ca97d5e7bb56c2edc6ffd209ef , < efd7866e114dcb44f86d151e843f8276b7efbc67 (git)
Affected: af43cbbf954b50ca97d5e7bb56c2edc6ffd209ef , < f1815e0aa770f2127c5df31eb5c2f0e37b60fa77 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.14.10 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
linux linux_kernel Affected: af43cbbf954b , < efd7866e114d (custom)
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Affected: af43cbbf954b , < f1815e0aa770 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Unaffected: 0 , < 5.13 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Unaffected: 5.14.10 , ≤ 5.14.* (custom)
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Unaffected: 5.15
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Affected: 5.13
    cpe:2.3:o:linux:linux_kernel:5.13:-:*:*:*:*:*:*
Create a notification for this product.
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            "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\")."
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        ],
        "id": "CVE-2021-47389",
        "lastModified": "2026-06-17T04:17:21.523",
        "metrics": {
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                "availabilityImpact": "LOW",
                "baseScore": 5.1,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.