CVE-2021-47389 - OpenCVE

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").

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

No data.

No data.

No data.

References

Link	Providers
https://git.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67
https://git.kernel.org/stable/c/f1815e0aa770f2127c5df31eb5c2f0e37b60fa77
https://lore.kernel.org/linux-cve-announce/2024052145-CVE-2021-47389-c01c@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47389
https://www.cve.org/CVERecord?id=CVE-2021-47389

History

No history.

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-05-21T15:03:48.216Z

Updated: 2024-08-04T05:39:59.120Z

Reserved: 2024-05-21T14:58:30.813Z

Link: CVE-2021-47389

Vulnrichment

Updated: 2024-08-04T05:39:59.120Z

NVD

Status : Awaiting Analysis

Published: 2024-05-21T15:15:24.330

Modified: 2024-07-09T16:22:03.467

Link: CVE-2021-47389

Redhat

Severity : Moderate

Publid Date: 2024-05-21T00:00:00Z

Links: CVE-2021-47389 - Bugzilla

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{"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", "upstream_fix": "kernel 5.14.10, kernel 5.15"}