CVE-2021-47554

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Let's fix it together."}, {"lang": "es", "value": "En el kernel de Linux se ha solucionado la siguiente vulnerabilidad: vdpa_sim: evitar poner un iova_domain no inicializado El sistema se bloquear\u00e1 si ponemos un iova_domain no inicializado, esto podr\u00eda pasar cuando ocurre un error antes de inicializar el iova_domain en vdpasim_create(). ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000000... RIP: 0010:__cpuhp_state_remove_instance+0x96/0x1c0... Seguimiento de llamadas: put_iova_domain+0x29/0x220 vdpasim_free+0xd1/0x120 [vdpa_release_] desarrollo+0x21/0x40 [ vdpa] device_release+0x33/0x90 kobject_release+0x63/0x160 vdpasim_create+0x127/0x2a0 [vdpa_sim] vdpasim_net_dev_add+0x7d/0xfe [vdpa_sim_net] vdpa_nl_cmd_dev_add_set_doit+0xe1/0x1a0 [ vdpa] genl_family_rcv_msg_doit+0x112/0x140 genl_rcv_msg+0xdf/0x1d0 ... Entonces debemos asegurarnos de que iova_domain ya est\u00e9 inicializado antes de colocarlo. Adem\u00e1s, es posible que recibamos la siguiente advertencia en este caso: ADVERTENCIA: ... drivers/iommu/iova.c:344 iova_cache_put+0x58/0x70 Por lo tanto, debemos asegurarnos de que iova_cache_put() se invoque solo si iova_cache_get() es ya invocado. Arreglemoslo juntos."}], "id": "CVE-2021-47554", "lastModified": "2026-06-17T04:17:45.417", "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-2021-47554", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-24T19:16:03.600031Z", "version": "2.0.3"}}]}, "published": "2024-05-24T15:15:20.160", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bb93ce4b150dde79f58e34103cbd1fe829796649"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e4d58ac67e63727aa45a4a26185876f598e8b3dd"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bb93ce4b150dde79f58e34103cbd1fe829796649"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e4d58ac67e63727aa45a4a26185876f598e8b3dd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: vdpa_sim: avoid putting an uninitialized iova_domain", "id": "2283395", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2283395"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-457", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvdpa_sim: avoid putting an uninitialized iova_domain\nThe system will crash if we put an uninitialized iova_domain, this\ncould happen when an error occurs before initializing the iova_domain\nin vdpasim_create().\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n...\nRIP: 0010:__cpuhp_state_remove_instance+0x96/0x1c0\n...\nCall Trace:\n<TASK>\nput_iova_domain+0x29/0x220\nvdpasim_free+0xd1/0x120 [vdpa_sim]\nvdpa_release_dev+0x21/0x40 [vdpa]\ndevice_release+0x33/0x90\nkobject_release+0x63/0x160\nvdpasim_create+0x127/0x2a0 [vdpa_sim]\nvdpasim_net_dev_add+0x7d/0xfe [vdpa_sim_net]\nvdpa_nl_cmd_dev_add_set_doit+0xe1/0x1a0 [vdpa]\ngenl_family_rcv_msg_doit+0x112/0x140\ngenl_rcv_msg+0xdf/0x1d0\n...\nSo we must make sure the iova_domain is already initialized before\nput it.\nIn addition, we may get the following warning in this case:\nWARNING: ... drivers/iommu/iova.c:344 iova_cache_put+0x58/0x70\nSo we must make sure the iova_cache_put() is invoked only if the\niova_cache_get() is already invoked. Let's fix it together."], "name": "CVE-2021-47554", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47554\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47554\nhttps://lore.kernel.org/linux-cve-announce/2024052443-CVE-2021-47554-f8a6@gregkh/T"], "threat_severity": "Low"}

{}