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If it is\nnot protected by RCU read-critical region, when idr_for_each() calls\nradix_tree_node_free() through call_rcu() to free the radix_tree_node\nstructure, the node will be freed immediately, and when reading the next\nnode in radix_tree_for_each_slot(), the already freed memory may be read.\n\nTherefore, we need to add code to make sure that idr_for_each() is\nprotected within the RCU read-critical region when we call it in\nshm_destroy_orphaned()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipc: correcci\u00f3n para proteger las b\u00fasquedas IPCS mediante RCU. syzbot inform\u00f3 del descubrimiento de una vulnerabilidad de use-after-free, [0] [0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/ idr_for_each() est\u00e1 protegido por rwsem, pero esto no es suficiente. Si no est\u00e1 protegido por la regi\u00f3n cr\u00edtica de lectura de RCU, cuando idr_for_each() llama a radix_tree_node_free() mediante call_rcu() para liberar la estructura radix_tree_node, el nodo se liberar\u00e1 inmediatamente y, al leer el siguiente nodo en radix_tree_for_each_slot(), se podr\u00e1 leer la memoria ya liberada. Por lo tanto, necesitamos agregar c\u00f3digo para asegurarnos de que idr_for_each() est\u00e9 protegido dentro de la regi\u00f3n cr\u00edtica de lectura de RCU cuando lo llamamos en shm_destroy_orphaned()."}], "id": "CVE-2025-38212", "lastModified": "2025-12-18T21:11:01.400", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-07-04T14:15:29.473", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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{"created": "2025-07-13T21:47:55.369272+00:00", "updated": "2025-07-13T21:47:55.369318+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}