CVE-2021-47453

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This can potentially cause a crash when\nunloading the driver on systems that do not initialize support for RDMA.\nBut, this free cannot be gated by the status bit for RDMA, since it is\nallocated if the driver detects support for RDMA at probe time, but the\ndriver can enter into a state where RDMA is not supported after the IDA\nhas been allocated at probe time and this would lead to a memory leak.\n\nInitialize aux_idx to an invalid value and check for a valid value when\nunloading to determine if an IDA free is necessary."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ice: Evite fallas por IDA innecesario libre en la ruta de eliminaci\u00f3n, hay un intento de liberar el IDA aux_idx, ya sea que est\u00e9 asignado o no. Potencialmente, esto puede provocar un bloqueo al descargar el controlador en sistemas que no inicializan la compatibilidad con RDMA. Sin embargo, esta liberaci\u00f3n no puede ser controlada por el bit de estado para RDMA, ya que se asigna si el controlador detecta soporte para RDMA en el momento de la prueba, pero el controlador puede entrar en un estado en el que RDMA no es compatible despu\u00e9s de que se haya asignado el IDA en el momento de la prueba. tiempo y esto provocar\u00eda una p\u00e9rdida de memoria. Inicialice aux_idx con un valor no v\u00e1lido y verifique si hay un valor v\u00e1lido al descargar para determinar si es necesaria una IDA libre."}], "id": "CVE-2021-47453", "lastModified": "2026-06-17T04:17:30.550", "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-2021-47453", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-24T19:24:44.764547Z", "version": "2.0.3"}}]}, "published": "2024-05-22T07:15:10.380", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73e30a62b19b9fbb4e6a3465c59da186630d5f2e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/777682e59840e24e6c5672197e6ffbcf4bff823b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73e30a62b19b9fbb4e6a3465c59da186630d5f2e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/777682e59840e24e6c5672197e6ffbcf4bff823b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ice: Avoid crash from unnecessary IDA free", "id": "2282905", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282905"}, "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-665", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nice: Avoid crash from unnecessary IDA free\nIn the remove path, there is an attempt to free the aux_idx IDA whether\nit was allocated or not. This can potentially cause a crash when\nunloading the driver on systems that do not initialize support for RDMA.\nBut, this free cannot be gated by the status bit for RDMA, since it is\nallocated if the driver detects support for RDMA at probe time, but the\ndriver can enter into a state where RDMA is not supported after the IDA\nhas been allocated at probe time and this would lead to a memory leak.\nInitialize aux_idx to an invalid value and check for a valid value when\nunloading to determine if an IDA free is necessary."], "name": "CVE-2021-47453", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "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": "2024-05-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47453\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47453\nhttps://lore.kernel.org/linux-cve-announce/2024052243-CVE-2021-47453-2f17@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-12T22:15:48.650885+00:00", "updated": "2025-07-12T22:15:48.650931+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}