{"schema":"threatline.record/2","record":{"id":"CVE-2026-98253","aliases":[],"summary":"RDMA/ucma: Serialize join and leave on copy_to_user failure","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"60d613b39e8d0c9f3b526e9c96445422b4562d76","lessThan":"29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9","status":"affected","versionType":"git"},{"version":"fe454dc31e84f8c14cb8942fcb61666c9f40745b","lessThan":"52172e11bd074ccaded21740ffeb67123f01dd00","status":"affected","versionType":"git"},{"version":"fe454dc31e84f8c14cb8942fcb61666c9f40745b","lessThan":"01e29d0d78a8f66f221625720a04939eef5ec1f6","status":"affected","versionType":"git"},{"version":"fe454dc31e84f8c14cb8942fcb61666c9f40745b","lessThan":"ae805d204cf1f15b87d1bf3529b4c649f3519420","status":"affected","versionType":"git"},{"version":"fe454dc31e84f8c14cb8942fcb61666c9f40745b","lessThan":"43c4e24bd10370fc976f6220518049ce71419399","status":"affected","versionType":"git"},{"version":"fe454dc31e84f8c14cb8942fcb61666c9f40745b","lessThan":"01cbdb724c584d7772fd25af2e4dfdf8527ce0d5","status":"affected","versionType":"git"},{"version":"fe454dc31e84f8c14cb8942fcb61666c9f40745b","lessThan":"83610ee5e498fa5bfcb80031d2b959baea276bf6","status":"affected","versionType":"git"},{"version":"fe454dc31e84f8c14cb8942fcb61666c9f40745b","lessThan":"662ade4de9ff5eceb0820a9f8e9fac70ba6a815b","status":"affected","versionType":"git"},{"version":"a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4","status":"affected","versionType":"git"},{"version":"5.10.20","lessThan":"5.10.271","status":"affected","versionType":"semver"},{"version":"5.11.3","lessThan":"5.12","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.12","status":"affected"},{"version":"0","lessThan":"5.12","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"52172e11bd074ccaded21740ffeb67123f01dd00","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"01e29d0d78a8f66f221625720a04939eef5ec1f6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"43c4e24bd10370fc976f6220518049ce71419399","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"01cbdb724c584d7772fd25af2e4dfdf8527ce0d5","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"83610ee5e498fa5bfcb80031d2b959baea276bf6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"662ade4de9ff5eceb0820a9f8e9fac70ba6a815b","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.10.271","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","source_modified_at":"2026-10-19T09:16:24.567Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.12","basis":"first unaffected version stated in the CVE record"}],"cvss":7.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00138,"percentile":0.02938,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:45:20.077Z","modified_at":"2026-10-19T09:16:24.567Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98253","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:16:24.567Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98253","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/52172e11bd074ccaded21740ffeb67123f01dd00"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/01e29d0d78a8f66f221625720a04939eef5ec1f6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ae805d204cf1f15b87d1bf3529b4c649f3519420"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/43c4e24bd10370fc976f6220518049ce71419399"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/01cbdb724c584d7772fd25af2e4dfdf8527ce0d5"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/83610ee5e498fa5bfcb80031d2b959baea276bf6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/662ade4de9ff5eceb0820a9f8e9fac70ba6a815b"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:16:24.567Z","content_hash":"1d8ee8b9111389953fe360955b8e8a92f0ba69005ed4e53bd5bdfcbda1c82c84"}}