{ "id": "CVE-2017-12190", "sourceIdentifier": "secalert@redhat.com", "published": "2017-11-22T18:29:00.477", "lastModified": "2025-04-20T01:37:25.860", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [ { "lang": "en", "value": "The bio_map_user_iov and bio_unmap_user functions in block/bio.c in the Linux kernel before 4.13.8 do unbalanced refcounting when a SCSI I/O vector has small consecutive buffers belonging to the same page. The bio_add_pc_page function merges them into one, but the page reference is never dropped. This causes a memory leak and possible system lockup (exploitable against the host OS by a guest OS user, if a SCSI disk is passed through to a virtual machine) due to an out-of-memory condition." }, { "lang": "es", "value": "Las funciones bio_map_user_iov y bio_unmap_user en block/bio.c en el kernel de Linux en versiones anteriores a la 4.13.8 realizan un refcount no equilibrado cuando un vector SCSI I/O tiene b\u00faferes peque\u00f1os consecutivos que pertenecen a la misma p\u00e1gina. La funci\u00f3n bio_add_pc_page los combina en uno solo, pero la referencia de la p\u00e1gina nunca se anula. Esto provoca una fuga de memoria y un posible bloqueo del sistema (explotable contra el host del sistema operativo por un usuario invitado del sistema operativo, si se pasa un disco SCSI a una m\u00e1quina virtual) debido a una condici\u00f3n de falta de memoria." } ], "metrics": { "cvssMetricV30": [ { "source": "nvd@nist.gov", "type": "Primary", "cvssData": { "version": "3.0", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH" }, "exploitabilityScore": 2.0, "impactScore": 4.0 } ], "cvssMetricV2": [ { "source": "nvd@nist.gov", "type": "Primary", "cvssData": { "version": "2.0", "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C", "baseScore": 4.9, "accessVector": "LOCAL", "accessComplexity": "LOW", "authentication": "NONE", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "COMPLETE" }, "baseSeverity": "MEDIUM", "exploitabilityScore": 3.9, "impactScore": 6.9, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false } ] }, "weaknesses": [ { "source": "secalert@redhat.com", "type": "Primary", "description": [ { "lang": "en", "value": "CWE-400" } ] }, { "source": "nvd@nist.gov", "type": "Secondary", "description": [ { "lang": "en", "value": "CWE-772" } ] } ], "configurations": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndIncluding": "4.13.7", "matchCriteriaId": "11C6B206-8716-4A16-81BD-F3B8C8ACBE19" } ] } ] } ], "references": [ { "url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058", "source": 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"source": "secalert@redhat.com" }, { "url": "https://support.f5.com/csp/article/K93472064?utm_source=f5support&%3Butm_medium=RSS", "source": "secalert@redhat.com" }, { "url": "https://usn.ubuntu.com/3582-1/", "source": "secalert@redhat.com" }, { "url": "https://usn.ubuntu.com/3582-2/", "source": "secalert@redhat.com" }, { "url": "https://usn.ubuntu.com/3583-1/", "source": "secalert@redhat.com" }, { "url": "https://usn.ubuntu.com/3583-2/", "source": "secalert@redhat.com" }, { "url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Issue Tracking", "Patch", "Vendor Advisory" ] }, { "url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=95d78c28b5a85bacbc29b8dba7c04babb9b0d467", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Issue Tracking", "Patch", "Vendor Advisory" ] }, { "url": 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