{"api_version":"1","generated_at":"2026-08-02T10:44:27+00:00","cve":"CVE-2025-39880","urls":{"html":"https://cve.report/CVE-2025-39880","api":"https://cve.report/api/cve/CVE-2025-39880.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-39880","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-39880"},"summary":{"title":"libceph: fix invalid accesses to ceph_connection_v1_info","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: fix invalid accesses to ceph_connection_v1_info\n\nThere is a place where generic code in messenger.c is reading and\nanother place where it is writing to con->v1 union member without\nchecking that the union member is active (i.e. msgr1 is in use).\n\nOn 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter,\nso such a read is almost guaranteed to return a bogus value instead of\n0 when msgr2 is in use.  This ends up being fairly benign because the\nside effect is just the invalidation of the authorizer and successive\nfetching of new tickets.\n\ncon->v1.connect_seq overlaps with con->v2.conn_bufs and the fact that\nit's being written to can cause more serious consequences, but luckily\nit's not something that happens often.","state":"PUBLISHED","assigner":"Linux","published_at":"2025-09-23 06:15:47","updated_at":"2026-07-30 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fix invalid accesses to ceph_connection_v1_info","CVE":"CVE-2025-39880","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"39880","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: fix invalid accesses to ceph_connection_v1_info\n\nThere is a place where generic code in messenger.c is reading and\nanother place where it is writing to con->v1 union member without\nchecking that the union member is active (i.e. msgr1 is in use).\n\nOn 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter,\nso such a read is almost guaranteed to return a bogus value instead of\n0 when msgr2 is in use.  This ends up being fairly benign because the\nside effect is just the invalidation of the authorizer and successive\nfetching of new tickets.\n\ncon->v1.connect_seq overlaps with con->v2.conn_bufs and the fact that\nit's being written to can cause more serious consequences, but luckily\nit's not something that happens often.","Type":"Description","Title":"libceph: fix invalid accesses to ceph_connection_v1_info"}]}}}