{"api_version":"1","generated_at":"2026-11-10T12:24:23+00:00","cve":"CVE-2026-100081","urls":{"html":"https://cve.report/CVE-2026-100081","api":"https://cve.report/api/cve/CVE-2026-100081.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-100081","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-100081"},"summary":{"title":"xen-netback: defer xenvif_mcast_addr_list_free()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: defer xenvif_mcast_addr_list_free()\n\nIn order for the function to legitimately avoid locking/RCU, it needs to\nrun after all TX/RX processing has finished/stopped: Lookups happen from\nxenvif_start_xmit(), while adds/removes happen from xenvif_tx_action()\n(called out of xenvif_poll()).\n\nMove the call out of xenvif_disconnect_data() (the call to the function\nfrom connect()'s error path doesn't require any cleaning up there), and\nput it past the synchronization point in backend_disconnect().\n\nThis is XSA-527 / CVE-2026-100081.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-11-06 19:17:03","updated_at":"2026-11-06 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the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: defer xenvif_mcast_addr_list_free()\n\nIn order for the function to legitimately avoid locking/RCU, it needs to\nrun after all TX/RX processing has finished/stopped: Lookups happen from\nxenvif_start_xmit(), while adds/removes happen from xenvif_tx_action()\n(called out of xenvif_poll()).\n\nMove the call out of xenvif_disconnect_data() (the call to the function\nfrom connect()'s error path doesn't require any cleaning up there), and\nput it past the synchronization point in backend_disconnect().\n\nThis is XSA-527 / CVE-2026-100081."}],"providerMetadata":{"dateUpdated":"2026-11-06T18:23:02.185Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/96e05a8ce243e2207704e2e7a6e7d1172730f515"},{"url":"https://git.kernel.org/stable/c/0e786123e46d08d2247ce93a5435e45ed9f4c5d1"},{"url":"https://git.kernel.org/stable/c/990d123d9eaa3ac6c979eed245658676d65ce0db"},{"url":"https://git.kernel.org/stable/c/0d515c409033c8e2a645a781be3ca76ab825fc8c"},{"url":"https://git.kernel.org/stable/c/a6bb2f1fa62c56279bdcdadce28d1310c5e12b62"},{"url":"https://git.kernel.org/stable/c/34f0f63dc6dc11895a17bb5672451b6b11622c99"},{"url":"https://git.kernel.org/stable/c/fb38fc58acb26d74fe8f7b19621fafaae3c040ff"}],"title":"xen-netback: defer xenvif_mcast_addr_list_free()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-100081","datePublished":"2026-11-06T18:23:02.185Z","dateReserved":"2026-09-25T10:25:14.456Z","dateUpdated":"2026-11-06T19:08:43.050Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-06 19:17:03","lastModifiedDate":"2026-11-06 19:17:03","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"100081","Ordinal":"1","Title":"xen-netback: defer xenvif_mcast_addr_list_free()","CVE":"CVE-2026-100081","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"100081","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: defer xenvif_mcast_addr_list_free()\n\nIn order for the function to legitimately avoid locking/RCU, it needs to\nrun after all TX/RX processing has finished/stopped: Lookups happen from\nxenvif_start_xmit(), while adds/removes happen from xenvif_tx_action()\n(called out of xenvif_poll()).\n\nMove the call out of xenvif_disconnect_data() (the call to the function\nfrom connect()'s error path doesn't require any cleaning up there), and\nput it past the synchronization point in backend_disconnect().\n\nThis is XSA-527 / CVE-2026-100081.","Type":"Description","Title":"xen-netback: defer xenvif_mcast_addr_list_free()"}]}}}