{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-21707", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-21707", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-02-27T02:07:21.084Z", "updatedAt": "2026-10-15T01:03:31.840Z", "importedAt": "2026-10-24T01:57:29.455Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "mptcp: consolidate suboption status", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: consolidate suboption status\n\nMPTCP maintains the received sub-options status is the bitmask carrying\nthe received suboptions and in several bitfields carrying per suboption\nadditional info.\n\nZeroing the bitmask before parsing is not enough to ensure a consistent\nstatus, and the MPTCP code has to additionally clear some bitfiled\ndepending on the actually parsed suboption.\n\nThe above schema is fragile, and syzbot managed to trigger a path where\na relevant bitfield is not cleared/initialized:\n\n BUG: KMSAN: uninit-value in __mptcp_expand_seq net/mptcp/options.c:1030 [inline]\n BUG: KMSAN: uninit-value in mptcp_expand_seq net/mptcp/protocol.h:864 [inline]\n BUG: KMSAN: uninit-value in ack_update_msk net/mptcp/options.c:1060 [inline]\n BUG: KMSAN: uninit-value in mptcp_incoming_options+0x2036/0x3d30 net/mptcp/options.c:1209\n __mptcp_expand_seq net/mptcp/options.c:1030 [inline]\n mptcp_expand_seq net/mptcp/protocol.h:864 [inline]\n ack_update_msk net/mptcp/options.c:1060 [inline]\n mptcp_incoming_options+0x2036/0x3d30 net/mptcp/options.c:1209\n tcp_data_queue+0xb4/0x7be0 net/ipv4/tcp_input.c:5233\n tcp_rcv_established+0x1061/0x2510 net/ipv4/tcp_input.c:6264\n tcp_v4_do_rcv+0x7f3/0x11a0 net/ipv4/tcp_ipv4.c:1916\n tcp_v4_rcv+0x51df/0x5750 net/ipv4/tcp_ipv4.c:2351\n ip_protocol_deliver_rcu+0x2a3/0x13d0 net/ipv4/ip_input.c:205\n ip_local_deliver_finish+0x336/0x500 net/ipv4/ip_input.c:233\n NF_HOOK include/linux/netfilter.h:314 [inline]\n ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254\n dst_input include/net/dst.h:460 [inline]\n ip_rcv_finish+0x4a2/0x520 net/ipv4/ip_input.c:447\n NF_HOOK include/linux/netfilter.h:314 [inline]\n ip_rcv+0xcd/0x380 net/ipv4/ip_input.c:567\n __netif_receive_skb_one_core net/core/dev.c:5704 [inline]\n __netif_receive_skb+0x319/0xa00 net/core/dev.c:5817\n process_backlog+0x4ad/0xa50 net/core/dev.c:6149\n __napi_poll+0xe7/0x980 net/core/dev.c:6902\n napi_poll net/core/dev.c:6971 [inline]\n net_rx_action+0xa5a/0x19b0 net/core/dev.c:7093\n handle_softirqs+0x1a0/0x7c0 kernel/softirq.c:561\n __do_softirq+0x14/0x1a kernel/softirq.c:595\n do_softirq+0x9a/0x100 kernel/softirq.c:462\n __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:389\n local_bh_enable include/linux/bottom_half.h:33 [inline]\n rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline]\n __dev_queue_xmit+0x2758/0x57d0 net/core/dev.c:4493\n dev_queue_xmit include/linux/netdevice.h:3168 [inline]\n neigh_hh_output include/net/neighbour.h:523 [inline]\n neigh_output include/net/neighbour.h:537 [inline]\n ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236\n __ip_finish_output+0x287/0x810\n ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324\n NF_HOOK_COND include/linux/netfilter.h:303 [inline]\n ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434\n dst_output include/net/dst.h:450 [inline]\n ip_local_out net/ipv4/ip_output.c:130 [inline]\n __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536\n ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550\n __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1468\n tcp_transmit_skb net/ipv4/tcp_output.c:1486 [inline]\n tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2829\n __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3012\n tcp_send_fin+0x9f6/0xf50 net/ipv4/tcp_output.c:3618\n __tcp_close+0x140c/0x1550 net/ipv4/tcp.c:3130\n __mptcp_close_ssk+0x74e/0x16f0 net/mptcp/protocol.c:2496\n mptcp_close_ssk+0x26b/0x2c0 net/mptcp/protocol.c:2550\n mptcp_pm_nl_rm_addr_or_subflow+0x635/0xd10 net/mptcp/pm_netlink.c:889\n mptcp_pm_nl_rm_subflow_received net/mptcp/pm_netlink.c:924 [inline]\n mptcp_pm_flush_addrs_and_subflows net/mptcp/pm_netlink.c:1688 [inline]\n mptcp_nl_flush_addrs_list net/mptcp/pm_netlink.c:1709 [inline]\n mptcp_pm_nl_flush_addrs_doit+0xe10/0x1630 net/mptcp/pm_netlink.c:1750\n genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]\n \n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc", "status": "affected", "versionType": "git", "lessThan": "3a7fda57b0f91f7ea34476b165f91a92feb17c96" }, { "version": "84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc", "status": "affected", "versionType": "git", "lessThan": "3b5332d416d151a15742d1b16e7319368e3cc5c6" }, { "version": "84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc", "status": "affected", "versionType": "git", "lessThan": "7f6c72b8ef8130760710e337dc8fbe7263954884" }, { "version": "84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc", "status": "affected", "versionType": "git", "lessThan": "6169e942370b4b6f9442d35c51519bf6c346843b" }, { "version": "84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc", "status": "affected", "versionType": "git", "lessThan": "ba0518f9e8688cd4fcb569e8df2a74874b4f3894" }, { "version": "84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc", "status": "affected", "versionType": "git", "lessThan": "c86b000782daba926c627d2fa00c3f60a75e7472" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.11" }, { "version": "5.15.179", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.129", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.76", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.13", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.13.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.13.*" }, { "version": "6.14", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }