CVE-2025-8860

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When the guest writes to register UEFI_VARS_REG_BUFFER_SIZE, the .write callback `uefi_vars_write` is invoked. The function allocates a heap buffer without zeroing the memory, leaving the buffer filled with residual data from prior allocations. When the guest later reads from register UEFI_VARS_REG_PIO_BUFFER_TRANSFER, the .read callback `uefi_vars_read` returns leftover metadata or other sensitive process memory from the previously allocated buffer, leading to an information disclosure vulnerability."}, {"lang": "es", "value": "Se encontr\u00f3 una falla en el dispositivo virtual uefi-vars de QEMU. Cuando un invitado escribe en el registro UEFI_VARS_REG_BUFFER_SIZE, se invoca la funci\u00f3n de devoluci\u00f3n de llamada .write 'uefi_vars_write'. La funci\u00f3n asigna un b\u00fafer de la pila sin poner a cero la memoria, dejando el b\u00fafer lleno de datos residuales de asignaciones anteriores. Cuando el invitado lee posteriormente del registro UEFI_VARS_REG_PIO_BUFFER_TRANSFER, la funci\u00f3n de devoluci\u00f3n de llamada .read 'uefi_vars_read' devuelve metadatos sobrantes u otra memoria sensible del proceso del b\u00fafer asignado previamente, lo que lleva a una vulnerabilidad de revelaci\u00f3n de informaci\u00f3n."}], "id": "CVE-2025-8860", "lastModified": "2026-06-17T10:07:48.133", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 3.3, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 1.4, "source": "patrick@puiterwijk.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-8860", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-19T14:34:28.398895Z", "version": "2.0.3"}}]}, "published": "2026-02-18T21:16:22.260", "references": [{"source": "patrick@puiterwijk.org", "url": "https://access.redhat.com/security/cve/CVE-2025-8860"}, {"source": "patrick@puiterwijk.org", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2387588"}], "sourceIdentifier": "patrick@puiterwijk.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-212"}], "source": "patrick@puiterwijk.org", "type": "Secondary"}]}

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