{"id":"CVE-2026-98253","revision":"6dcac97e58654b95886218cd82bcd54a","records":[{"revision":"6dcac97e58654b95886218cd82bcd54a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98253","aliases":[],"title":"RDMA/ucma: Serialize join and leave on copy_to_user failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/ucma: Serialize join and leave on copy_to_user failure\n\nrdma_join_multicast() queues RoCE work that later reads the ucma_multicast\nthrough event->param.ud.private_data, then list_add()s the CMA multicast\nat the head of id_priv->mc_list. rdma_leave_multicast() matches only by\nsockaddr and destroys the first hit.\n\nucma_process_join() used to drop ctx->mutex after a successful join and\nretake it only if copy_to_user() failed. Two concurrent JOIN_MCAST calls\nwith the same address can therefore insert a second CMA entry before the\nfirst thread's leave. leave then cancels the newer work and the older\nworker still dereferences the ucma_multicast that the first thread frees.\n\nKeep ctx->mutex held from rdma_join_multicast() through copy_to_user() and,\non -EFAULT, through rdma_leave_multicast() so leave cannot miss this join.\nDo not leave if join itself failed: that path never published this address\non mc_list, and a leave-by-addr would destroy an earlier successful join.","state":0,"publishedAt":"2026-10-06T08:45:20.077+00:00","modifiedAt":"2026-10-19T09:16:24.567+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/infiniband/core/ucma.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"60d613b39e8d0c9f3b526e9c96445422b4562d76\",\n                            \"lessThan\": \"29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fe454dc31e84f8c14cb8942fcb61666c9f40745b\",\n                            \"lessThan\": \"52172e11bd074ccaded21740ffeb67123f01dd00\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fe454dc31e84f8c14cb8942fcb61666c9f40745b\",\n                            \"lessThan\": \"01e29d0d78a8f66f221625720a04939eef5ec1f6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fe454dc31e84f8c14cb8942fcb61666c9f40745b\",\n                            \"lessThan\": \"ae805d204cf1f15b87d1bf3529b4c649f3519420\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fe454dc31e84f8c14cb8942fcb61666c9f40745b\",\n                            \"lessThan\": \"43c4e24bd10370fc976f6220518049ce71419399\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fe454dc31e84f8c14cb8942fcb61666c9f40745b\",\n                            \"lessThan\": \"01cbdb724c584d7772fd25af2e4dfdf8527ce0d5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fe454dc31e84f8c14cb8942fcb61666c9f40745b\",\n                            \"lessThan\": \"83610ee5e498fa5bfcb80031d2b959baea276bf6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fe454dc31e84f8c14cb8942fcb61666c9f40745b\",\n                            \"lessThan\": \"662ade4de9ff5eceb0820a9f8e9fac70ba6a815b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.10.20\",\n                            \"lessThan\": \"5.10.271\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.11.3\",\n                            \"lessThan\": \"5.12\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/infiniband/core/ucma.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.12\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.54\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.8\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9","https://git.kernel.org/stable/c/52172e11bd074ccaded21740ffeb67123f01dd00","https://git.kernel.org/stable/c/01e29d0d78a8f66f221625720a04939eef5ec1f6","https://git.kernel.org/stable/c/ae805d204cf1f15b87d1bf3529b4c649f3519420","https://git.kernel.org/stable/c/43c4e24bd10370fc976f6220518049ce71419399","https://git.kernel.org/stable/c/01cbdb724c584d7772fd25af2e4dfdf8527ce0d5","https://git.kernel.org/stable/c/83610ee5e498fa5bfcb80031d2b959baea276bf6","https://git.kernel.org/stable/c/662ade4de9ff5eceb0820a9f8e9fac70ba6a815b"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98253","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98253","identifiers":["CVE-2026-98253"]},"retained":false,"historicalAffected":[]}],"coverage":[]}