cve-2024-35960
Vulnerability from cvelistv5
Published
2024-05-20 09:41
Modified
2024-12-19 08:59
Severity ?
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Properly link new fs rules into the tree Previously, add_rule_fg would only add newly created rules from the handle into the tree when they had a refcount of 1. On the other hand, create_flow_handle tries hard to find and reference already existing identical rules instead of creating new ones. These two behaviors can result in a situation where create_flow_handle 1) creates a new rule and references it, then 2) in a subsequent step during the same handle creation references it again, resulting in a rule with a refcount of 2 that is not linked into the tree, will have a NULL parent and root and will result in a crash when the flow group is deleted because del_sw_hw_rule, invoked on rule deletion, assumes node->parent is != NULL. This happened in the wild, due to another bug related to incorrect handling of duplicate pkt_reformat ids, which lead to the code in create_flow_handle incorrectly referencing a just-added rule in the same flow handle, resulting in the problem described above. Full details are at [1]. This patch changes add_rule_fg to add new rules without parents into the tree, properly initializing them and avoiding the crash. This makes it more consistent with how rules are added to an FTE in create_flow_handle.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1263b0b26077b1183c3c45a0a2479573a351d423
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e8dc5cffc844dacfa79f056dea88002312f253f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d90ca9145f6b97b38d0c2b6b30f6ca6af9c1801
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5cf5337ef701830f173b4eec00a4f984adeb57a0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7aaee12b804c5e0374e7b132b6ec2158ff33dd64
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c6782ad4911cbee874e85630226ed389ff2e453
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/adf67a03af39095f05d82050f15813d6f700159d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de0139719cdda82806a47580ca0df06fc85e0bd2
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1263b0b26077b1183c3c45a0a2479573a351d423
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2e8dc5cffc844dacfa79f056dea88002312f253f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3d90ca9145f6b97b38d0c2b6b30f6ca6af9c1801
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5cf5337ef701830f173b4eec00a4f984adeb57a0
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7aaee12b804c5e0374e7b132b6ec2158ff33dd64
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7c6782ad4911cbee874e85630226ed389ff2e453
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/adf67a03af39095f05d82050f15813d6f700159d
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/de0139719cdda82806a47580ca0df06fc85e0bd2
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Impacted products
Vendor Product Version
Linux Linux Version: 4.10
Show details on NVD website

To clipboard 

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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-35960\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-20T10:15:11.190\",\"lastModified\":\"2024-11-21T09:21:18.037\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/mlx5: Properly link new fs rules into the tree\\n\\nPreviously, add_rule_fg would only add newly created rules from the\\nhandle into the tree when they had a refcount of 1. On the other hand,\\ncreate_flow_handle tries hard to find and reference already existing\\nidentical rules instead of creating new ones.\\n\\nThese two behaviors can result in a situation where create_flow_handle\\n1) creates a new rule and references it, then\\n2) in a subsequent step during the same handle creation references it\\n   again,\\nresulting in a rule with a refcount of 2 that is not linked into the\\ntree, will have a NULL parent and root and will result in a crash when\\nthe flow group is deleted because del_sw_hw_rule, invoked on rule\\ndeletion, assumes node-\u003eparent is != NULL.\\n\\nThis happened in the wild, due to another bug related to incorrect\\nhandling of duplicate pkt_reformat ids, which lead to the code in\\ncreate_flow_handle incorrectly referencing a just-added rule in the same\\nflow handle, resulting in the problem described above. Full details are\\nat [1].\\n\\nThis patch changes add_rule_fg to add new rules without parents into\\nthe tree, properly initializing them and avoiding the crash. This makes\\nit more consistent with how rules are added to an FTE in\\ncreate_flow_handle.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net/mlx5: vincular correctamente nuevas reglas fs al \u00e1rbol. Anteriormente, add_rule_fg solo agregaba reglas reci\u00e9n creadas desde el identificador al \u00e1rbol cuando ten\u00edan un recuento de 1. Por otro lado Por otro lado, create_flow_handle se esfuerza por encontrar y hacer referencia a reglas id\u00e9nticas ya existentes en lugar de crear otras nuevas. Estos dos comportamientos pueden dar lugar a una situaci\u00f3n en la que create_flow_handle 1) crea una nueva regla y hace referencia a ella, luego 2) en un paso posterior durante la creaci\u00f3n del mismo identificador hace referencia a ella nuevamente, lo que da como resultado una regla con un recuento de 2 que no est\u00e1 vinculada a el \u00e1rbol, tendr\u00e1 un padre y una ra\u00edz NULL y provocar\u00e1 un bloqueo cuando se elimine el grupo de flujo porque del_sw_hw_rule, invocado al eliminar la regla, asume que nodo-\u0026gt;padre es != NULL. Esto sucedi\u00f3 en la naturaleza, debido a otro error relacionado con el manejo incorrecto de identificadores de pkt_reformat duplicados, lo que llev\u00f3 al c\u00f3digo en create_flow_handle a hacer referencia incorrecta a una regla reci\u00e9n agregada en el mismo identificador de flujo, lo que result\u00f3 en el problema descrito anteriormente. Los detalles completos est\u00e1n en [1]. Este parche cambia add_rule_fg para agregar nuevas reglas sin padres al \u00e1rbol, inicializ\u00e1ndolas correctamente y evitando el bloqueo. Esto lo hace m\u00e1s coherente con la forma en que se agregan reglas a un FTE en create_flow_handle.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H\",\"baseScore\":9.1,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1263b0b26077b1183c3c45a0a2479573a351d423\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2e8dc5cffc844dacfa79f056dea88002312f253f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3d90ca9145f6b97b38d0c2b6b30f6ca6af9c1801\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5cf5337ef701830f173b4eec00a4f984adeb57a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7aaee12b804c5e0374e7b132b6ec2158ff33dd64\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c6782ad4911cbee874e85630226ed389ff2e453\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/adf67a03af39095f05d82050f15813d6f700159d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de0139719cdda82806a47580ca0df06fc85e0bd2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1263b0b26077b1183c3c45a0a2479573a351d423\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/2e8dc5cffc844dacfa79f056dea88002312f253f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/3d90ca9145f6b97b38d0c2b6b30f6ca6af9c1801\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/5cf5337ef701830f173b4eec00a4f984adeb57a0\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/7aaee12b804c5e0374e7b132b6ec2158ff33dd64\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/7c6782ad4911cbee874e85630226ed389ff2e453\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/adf67a03af39095f05d82050f15813d6f700159d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/de0139719cdda82806a47580ca0df06fc85e0bd2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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