{ "id": "CVE-2024-35902", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2024-05-19T09:15:11.037", "lastModified": "2024-12-30T19:47:46.853", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: fix possible cp null dereference\n\ncp might be null, calling cp->cp_conn would produce null dereference\n\n[Simon Horman adds:]\n\nAnalysis:\n\n* cp is a parameter of __rds_rdma_map and is not reassigned.\n\n* The following call-sites pass a NULL cp argument to __rds_rdma_map()\n\n - rds_get_mr()\n - rds_get_mr_for_dest\n\n* Prior to the code above, the following assumes that cp may be NULL\n (which is indicative, but could itself be unnecessary)\n\n\ttrans_private = rs->rs_transport->get_mr(\n\t\tsg, nents, rs, &mr->r_key, cp ? cp->cp_conn : NULL,\n\t\targs->vec.addr, args->vec.bytes,\n\t\tneed_odp ? ODP_ZEROBASED : ODP_NOT_NEEDED);\n\n* The code modified by this patch is guarded by IS_ERR(trans_private),\n where trans_private is assigned as per the previous point in this analysis.\n\n The only implementation of get_mr that I could locate is rds_ib_get_mr()\n which can return an ERR_PTR if the conn (4th) argument is NULL.\n\n* ret is set to PTR_ERR(trans_private).\n rds_ib_get_mr can return ERR_PTR(-ENODEV) if the conn (4th) argument is NULL.\n Thus ret may be -ENODEV in which case the code in question will execute.\n\nConclusion:\n* cp may be NULL at the point where this patch adds a check;\n this patch does seem to address a possible bug" }, { "lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/rds: corrige la posible desreferencia nula de cp cp podr\u00eda ser nulo, llamar a cp->cp_conn producir\u00eda una desreferencia nula [Simon Horman agrega:] An\u00e1lisis: * cp es un par\u00e1metro de __rds_rdma_map y no es reasignado. * Los siguientes sitios de llamadas pasan un argumento cp NULL a __rds_rdma_map() - rds_get_mr() - rds_get_mr_for_dest * Antes del c\u00f3digo anterior, lo siguiente supone que cp puede ser NULL (lo cual es indicativo, pero podr\u00eda ser innecesario) trans_private = rs ->rs_transport->get_mr( sg, nents, rs, &mr->r_key, cp ? cp->cp_conn : NULL, args->vec.addr, args->vec.bytes, need_odp ? ODP_ZEROBASED : ODP_NOT_NEEDED); * El c\u00f3digo modificado por este parche est\u00e1 custodiado por IS_ERR(trans_private), donde trans_private se asigna seg\u00fan el punto anterior de este an\u00e1lisis. La \u00fanica implementaci\u00f3n de get_mr que pude localizar es rds_ib_get_mr() que puede devolver un ERR_PTR si el argumento conn (cuarto) es NULL. * ret est\u00e1 establecido en PTR_ERR(trans_private). rds_ib_get_mr puede devolver ERR_PTR(-ENODEV) si el argumento de conexi\u00f3n (cuarto) es NULL. Por lo tanto, ret puede ser -ENODEV, en cuyo caso se ejecutar\u00e1 el c\u00f3digo en cuesti\u00f3n. Conclusi\u00f3n: * cp puede ser NULL en el punto donde este parche agrega una verificaci\u00f3n; este parche parece solucionar un posible error " } ], "metrics": { "cvssMetricV31": [ { "source": "nvd@nist.gov", "type": "Primary", "cvssData": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH" }, "exploitabilityScore": 1.8, "impactScore": 3.6 } ] }, "weaknesses": [ { "source": "nvd@nist.gov", "type": "Primary", "description": [ { "lang": "en", "value": "CWE-476" } ] } ], "configurations": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.310", "versionEndExcluding": 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