CVE-2021-28715

{"id": "CVE-2021-28715", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 2.1, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "LOW", "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 2.0}]}, "published": "2022-01-06T18:15:07.813", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html", "tags": ["Mailing List", "Third Party Advisory"], "source": "security@xen.org"}, {"url": "https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html", "tags": ["Mailing List", "Third Party Advisory"], "source": "security@xen.org"}, {"url": "https://www.debian.org/security/2022/dsa-5050", "tags": ["Third Party Advisory"], "source": "security@xen.org"}, {"url": "https://www.debian.org/security/2022/dsa-5096", "tags": ["Third Party Advisory"], "source": "security@xen.org"}, {"url": "https://xenbits.xenproject.org/xsa/advisory-392.txt", "tags": ["Vendor Advisory"], "source": "security@xen.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "Guest can force Linux netback driver to hog large amounts of kernel memory T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Incoming data packets for a guest in the Linux kernel's netback driver are buffered until the guest is ready to process them. There are some measures taken for avoiding to pile up too much data, but those can be bypassed by the guest: There is a timeout how long the client side of an interface can stop consuming new packets before it is assumed to have stalled, but this timeout is rather long (60 seconds by default). Using a UDP connection on a fast interface can easily accumulate gigabytes of data in that time. (CVE-2021-28715) The timeout could even never trigger if the guest manages to have only one free slot in its RX queue ring page and the next package would require more than one free slot, which may be the case when using GSO, XDP, or software hashing. (CVE-2021-28714)"}, {"lang": "es", "value": "Un hu\u00e9sped puede forzar al controlador de netback de Linux a acaparar grandes cantidades de memoria del kernel Este registro de informaci\u00f3n CNA est\u00e1 relacionado con m\u00faltiples CVEs; el texto explica qu\u00e9 aspectos/vulnerabilidades corresponden a cada CVE]. Los paquetes de datos entrantes para un hu\u00e9sped en el controlador de netback del kernel de Linux son almacenados en el b\u00fafer hasta que el hu\u00e9sped est\u00e1 listo para procesarlos. Son tomadas algunas medidas para evitar que sean acumulados demasiados datos, pero \u00e9stas pueden ser obviadas por el hu\u00e9sped: Se presenta un tiempo de espera en el que el lado del cliente de una interfaz puede dejar de consumir nuevos paquetes antes de que sea asumido que ha sido estancado, pero este tiempo de espera es bastante largo (60 segundos por defecto). Usando una conexi\u00f3n UDP en una interfaz r\u00e1pida pueden acumularse f\u00e1cilmente gigabytes de datos en ese tiempo. (CVE-2021-28715) El tiempo de espera podr\u00eda incluso no dispararse nunca si el hu\u00e9sped consigue tener s\u00f3lo una ranura libre en su p\u00e1gina de anillo de cola RX y el siguiente paquete requerir\u00eda m\u00e1s de una ranura libre, lo que puede ser el caso cuando se usa OSG, XDP o hashing de software. (CVE-2021-28714)"}], "lastModified": "2023-08-08T14:22:24.967", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "103D9D8F-806F-4043-80C3-73831775798E", "versionEndExcluding": "5.15.0"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"}, {"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"}, {"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"}], "operator": "OR"}]}], "sourceIdentifier": "security@xen.org"}