{ "document": { "aggregate_severity": { "text": "High" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu18.04els/vex/2021/cve-2021-47391-els_os-ubuntu18_04els.json" } ], "title": "Security update on CVE-2021-47391", "tracking": { "current_release_date": "2025-12-23T22:15:38Z", "generator": { "date": "2025-12-23T22:15:38Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2021-47391-ELS_OS-UBUNTU18.04ELS", "initial_release_date": "2021-01-01T00:00:00Z", "revision_history": [ { "date": "2021-01-01T00:00:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-10-16T20:55:24Z", "number": "2", "summary": "Official Publication" }, { "date": 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"linux-modules-4.15.0-252-tuxcare.els40-lowlatency-0:4.15.0-252.263.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-tools-common-0:4.15.0-252.263.all as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-tools-common-0:4.15.0-252.263.all" }, "product_reference": "linux-tools-common-0:4.15.0-252.263.all", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-headers-generic-0:4.15.0.252.263.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-headers-generic-0:4.15.0.252.263.amd64" }, "product_reference": "linux-headers-generic-0:4.15.0.252.263.amd64", "relates_to_product_reference": "Ubuntu-18" } ] }, "vulnerabilities": [ { "cve": "CVE-2021-47391", "cwe": { "id": "CWE-416", "name": "Use After Free" }, "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/cma: Ensure rdma_addr_cancel() happens before issuing more requests\n\nThe FSM can run in a circle allowing rdma_resolve_ip() to be called twice\non the same id_priv. While this cannot happen without going through the\nwork, it violates the invariant that the same address resolution\nbackground request cannot be active twice.\n\n CPU 1 CPU 2\n\nrdma_resolve_addr():\n RDMA_CM_IDLE -> RDMA_CM_ADDR_QUERY\n rdma_resolve_ip(addr_handler) #1\n\n\t\t\t process_one_req(): for #1\n addr_handler():\n RDMA_CM_ADDR_QUERY -> RDMA_CM_ADDR_BOUND\n mutex_unlock(&id_priv->handler_mutex);\n [.. handler still running ..]\n\nrdma_resolve_addr():\n RDMA_CM_ADDR_BOUND -> RDMA_CM_ADDR_QUERY\n rdma_resolve_ip(addr_handler)\n !! two requests are now on the req_list\n\nrdma_destroy_id():\n destroy_id_handler_unlock():\n _destroy_id():\n cma_cancel_operation():\n rdma_addr_cancel()\n\n // process_one_req() self removes it\n\t\t spin_lock_bh(&lock);\n cancel_delayed_work(&req->work);\n\t if (!list_empty(&req->list)) == true\n\n ! rdma_addr_cancel() returns after process_on_req #1 is done\n\n kfree(id_priv)\n\n\t\t\t process_one_req(): for #2\n addr_handler():\n\t mutex_lock(&id_priv->handler_mutex);\n !! Use after free on id_priv\n\nrdma_addr_cancel() expects there to be one req on the list and only\ncancels the first one. The self-removal behavior of the work only happens\nafter the handler has returned. This yields a situations where the\nreq_list can have two reqs for the same \"handle\" but rdma_addr_cancel()\nonly cancels the first one.\n\nThe second req remains active beyond rdma_destroy_id() and will\nuse-after-free id_priv once it inevitably triggers.\n\nFix this by remembering if the id_priv has called rdma_resolve_ip() and\nalways cancel before calling it again. This ensures the req_list never\ngets more than one item in it and doesn't cost anything in the normal flow\nthat never uses this strange error path.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "Ubuntu-18:linux-buildinfo-4.15.0-252-tuxcare.els40-generic-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-buildinfo-4.15.0-252-tuxcare.els40-lowlatency-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-cloud-tools-4.15.0-252-tuxcare.els40-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-cloud-tools-4.15.0-252-tuxcare.els40-generic-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-cloud-tools-4.15.0-252-tuxcare.els40-lowlatency-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-cloud-tools-common-0:4.15.0-252.263.all", 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"Ubuntu-18:linux-lowlatency-0:4.15.0.252.263.amd64", "Ubuntu-18:linux-modules-4.15.0-252-tuxcare.els40-generic-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-modules-4.15.0-252-tuxcare.els40-lowlatency-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-modules-extra-4.15.0-252-tuxcare.els40-generic-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-source-0:4.15.0.252.263.all", "Ubuntu-18:linux-source-4.15.0-0:4.15.0-252.263.all", "Ubuntu-18:linux-tools-4.15.0-252-tuxcare.els40-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-tools-4.15.0-252-tuxcare.els40-generic-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-tools-4.15.0-252-tuxcare.els40-lowlatency-0:4.15.0-252.263.amd64", "Ubuntu-18:linux-tools-common-0:4.15.0-252.263.all", "Ubuntu-18:linux-tools-generic-0:4.15.0.252.263.amd64", "Ubuntu-18:linux-tools-host-0:4.15.0-252.263.all", "Ubuntu-18:linux-tools-lowlatency-0:4.15.0.252.263.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2021-47391" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/03d884671572af8bcfbc9e63944c1021efce7589", "url": "https://git.kernel.org/stable/c/03d884671572af8bcfbc9e63944c1021efce7589" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/305d568b72f17f674155a2a8275f865f207b3808", "url": "https://git.kernel.org/stable/c/305d568b72f17f674155a2a8275f865f207b3808" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/9a085fa9b7d644a234465091e038c1911e1a4f2a", "url": "https://git.kernel.org/stable/c/9a085fa9b7d644a234465091e038c1911e1a4f2a" } ], "release_date": "2024-05-21T15:15:00Z", "scores": [ { "cvss_v3": { "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": 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