CVE-2022-48890

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If the I/O\nsubmission fails in storvsc_do_io(), the I/O is typically retried by higher\nlevel code, but the bounce buffer memory is never freed. The mostly like\ncause of I/O submission failure is a full VMBus channel ring buffer, which\nis not uncommon under high I/O loads. Eventually enough bounce buffer\nmemory leaks that the confidential VM can't do any I/O. The same problem\ncan arise in a non-confidential VM with kernel boot parameter\nswiotlb=force.\n\nFix this by doing scsi_dma_unmap() in the case of an I/O submission\nerror, which frees the bounce buffer memory."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: scsi: storvsc: corrige la fuga del b\u00fafer de rebote swiotlb en una VM confidencial storvsc_queuecommand() asigna la lista de dispersi\u00f3n/recopilaci\u00f3n usando scsi_dma_map(), que en una VM confidencial asigna buffers de rebote swiotlb. Si el env\u00edo de E/S falla en storvsc_do_io(), la E/S normalmente se reintenta mediante c\u00f3digo de nivel superior, pero la memoria del b\u00fafer de rebote nunca se libera. La causa m\u00e1s com\u00fan de falla en el env\u00edo de E/S es un b\u00fafer de anillo de canal VMBus lleno, lo cual no es infrecuente bajo cargas de E/S elevadas. Con el tiempo, se pierden suficientes memorias del b\u00fafer de rebote como para que la m\u00e1quina virtual confidencial no pueda realizar ninguna E/S. El mismo problema puede surgir en una m\u00e1quina virtual no confidencial con el par\u00e1metro de arranque del kernel swiotlb=force. Solucione este problema haciendo scsi_dma_unmap() en el caso de un error de env\u00edo de E/S, lo que libera la memoria del b\u00fafer de rebote."}], "id": "CVE-2022-48890", "lastModified": "2026-06-17T05:16:32.400", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-48890", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:04:25.311779Z", "version": "2.0.3"}}]}, "published": "2024-08-21T07:15:05.303", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/67ff3d0a49f3d445c3922e30a54e03c161da561e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/87c71e88f6a6619ffb1ff88f84dff48ef6d57adb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: scsi: storvsc: Fix swiotlb bounce buffer leak in confidential VM", "id": "2306411", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2306411"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L", "status": "draft"}, "cwe": "CWE-401", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nscsi: storvsc: Fix swiotlb bounce buffer leak in confidential VM\nstorvsc_queuecommand() maps the scatter/gather list using scsi_dma_map(),\nwhich in a confidential VM allocates swiotlb bounce buffers. If the I/O\nsubmission fails in storvsc_do_io(), the I/O is typically retried by higher\nlevel code, but the bounce buffer memory is never freed. The mostly like\ncause of I/O submission failure is a full VMBus channel ring buffer, which\nis not uncommon under high I/O loads. Eventually enough bounce buffer\nmemory leaks that the confidential VM can't do any I/O. The same problem\ncan arise in a non-confidential VM with kernel boot parameter\nswiotlb=force.\nFix this by doing scsi_dma_unmap() in the case of an I/O submission\nerror, which frees the bounce buffer memory."], "name": "CVE-2022-48890", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-08-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48890\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48890\nhttps://lore.kernel.org/linux-cve-announce/2024082109-CVE-2022-48890-7f36@gregkh/T"], "threat_severity": "Low"}

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