CVE-2025-21707 (GCVE-0-2025-21707)

Vulnerability from cvelistv5 – Published: 2025-02-27 02:07 – Updated: 2026-08-05 11:53
VLAI
Title
mptcp: consolidate suboption status
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: consolidate suboption status MPTCP maintains the received sub-options status is the bitmask carrying the received suboptions and in several bitfields carrying per suboption additional info. Zeroing the bitmask before parsing is not enough to ensure a consistent status, and the MPTCP code has to additionally clear some bitfiled depending on the actually parsed suboption. The above schema is fragile, and syzbot managed to trigger a path where a relevant bitfield is not cleared/initialized: BUG: KMSAN: uninit-value in __mptcp_expand_seq net/mptcp/options.c:1030 [inline] BUG: KMSAN: uninit-value in mptcp_expand_seq net/mptcp/protocol.h:864 [inline] BUG: KMSAN: uninit-value in ack_update_msk net/mptcp/options.c:1060 [inline] BUG: KMSAN: uninit-value in mptcp_incoming_options+0x2036/0x3d30 net/mptcp/options.c:1209 __mptcp_expand_seq net/mptcp/options.c:1030 [inline] mptcp_expand_seq net/mptcp/protocol.h:864 [inline] ack_update_msk net/mptcp/options.c:1060 [inline] mptcp_incoming_options+0x2036/0x3d30 net/mptcp/options.c:1209 tcp_data_queue+0xb4/0x7be0 net/ipv4/tcp_input.c:5233 tcp_rcv_established+0x1061/0x2510 net/ipv4/tcp_input.c:6264 tcp_v4_do_rcv+0x7f3/0x11a0 net/ipv4/tcp_ipv4.c:1916 tcp_v4_rcv+0x51df/0x5750 net/ipv4/tcp_ipv4.c:2351 ip_protocol_deliver_rcu+0x2a3/0x13d0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x336/0x500 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish+0x4a2/0x520 net/ipv4/ip_input.c:447 NF_HOOK include/linux/netfilter.h:314 [inline] ip_rcv+0xcd/0x380 net/ipv4/ip_input.c:567 __netif_receive_skb_one_core net/core/dev.c:5704 [inline] __netif_receive_skb+0x319/0xa00 net/core/dev.c:5817 process_backlog+0x4ad/0xa50 net/core/dev.c:6149 __napi_poll+0xe7/0x980 net/core/dev.c:6902 napi_poll net/core/dev.c:6971 [inline] net_rx_action+0xa5a/0x19b0 net/core/dev.c:7093 handle_softirqs+0x1a0/0x7c0 kernel/softirq.c:561 __do_softirq+0x14/0x1a kernel/softirq.c:595 do_softirq+0x9a/0x100 kernel/softirq.c:462 __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:389 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline] __dev_queue_xmit+0x2758/0x57d0 net/core/dev.c:4493 dev_queue_xmit include/linux/netdevice.h:3168 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236 __ip_finish_output+0x287/0x810 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434 dst_output include/net/dst.h:450 [inline] ip_local_out net/ipv4/ip_output.c:130 [inline] __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1468 tcp_transmit_skb net/ipv4/tcp_output.c:1486 [inline] tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2829 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3012 tcp_send_fin+0x9f6/0xf50 net/ipv4/tcp_output.c:3618 __tcp_close+0x140c/0x1550 net/ipv4/tcp.c:3130 __mptcp_close_ssk+0x74e/0x16f0 net/mptcp/protocol.c:2496 mptcp_close_ssk+0x26b/0x2c0 net/mptcp/protocol.c:2550 mptcp_pm_nl_rm_addr_or_subflow+0x635/0xd10 net/mptcp/pm_netlink.c:889 mptcp_pm_nl_rm_subflow_received net/mptcp/pm_netlink.c:924 [inline] mptcp_pm_flush_addrs_and_subflows net/mptcp/pm_netlink.c:1688 [inline] mptcp_nl_flush_addrs_list net/mptcp/pm_netlink.c:1709 [inline] mptcp_pm_nl_flush_addrs_doit+0xe10/0x1630 net/mptcp/pm_netlink.c:1750 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] ---truncated---
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc , < 3a7fda57b0f91f7ea34476b165f91a92feb17c96 (git)
Affected: 84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc , < 3b5332d416d151a15742d1b16e7319368e3cc5c6 (git)
Affected: 84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc , < 7f6c72b8ef8130760710e337dc8fbe7263954884 (git)
Affected: 84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc , < 6169e942370b4b6f9442d35c51519bf6c346843b (git)
Affected: 84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc , < ba0518f9e8688cd4fcb569e8df2a74874b4f3894 (git)
Affected: 84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc , < c86b000782daba926c627d2fa00c3f60a75e7472 (git)
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Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.129 , ≤ 6.1.* (semver)
Unaffected: 6.6.76 , ≤ 6.6.* (semver)
Unaffected: 6.12.13 , ≤ 6.12.* (semver)
Unaffected: 6.13.2 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "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---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable parser runs on TCP option bytes of received segments (`tcp_v4_rcv \u2192 tcp_data_queue \u2192 mptcp_incoming_options \u2192 mptcp_get_options`), so any remote MPTCP peer of an internet-facing MPTCP-enabled server or proxy can trigger it with crafted packets. No local access is involved at any point on the path.\nAC:L - The attacker fully controls the TCP option layout and can deterministically produce the MP_CAPABLE-with-data plus malformed-DSS combination that leaves `use_ack` set while `data_ack` is never populated; it is repeatable on every packet. Because the RX softirq reuses the same `mptcp_get_options()` stack frame, the attacker can also prime the uninitialized slot with a value of their choosing from a preceding packet.\nPR:N - The attacker is simply the remote endpoint of an MPTCP connection and needs no credentials, capabilities, or local account on the target; there is no authentication or authorization check between packet receive and `mptcp_incoming_options()`.\nUI:N - An MPTCP-enabled server (the primary MPTCP deployment: mobile-network gateways, proxies, load balancers, handset-facing services) processes the attacker\u0027s connection and crafted segments automatically in softirq context. No victim action is required.\nS:U - The uninitialized read, the corrupted state, and the resulting disclosure all remain within the kernel\u0027s own security authority on the affected host. No VM, sandbox, or IOMMU boundary is crossed.\nC:H - Uninitialized kernel stack memory is consumed as protocol state and, per the syzbot origin chain, propagates through `mptcp_pm_add_addr_signal()` into `mptcp_write_options()`\u0027s `put_unaligned_be32()` and out onto the wire to the remote peer. The leak is repeatable on every packet and every connection, so an attacker can harvest kernel stack contents (pointers, KASLR material, residual softirq data) without bound.\nI:H - The uninitialized/attacker-primed `data_ack` is written into `msk-\u003esnd_una`, `msk-\u003ewnd_end` and `msk-\u003ebytes_acked`, causing `__mptcp_clean_una()` to discard un-acknowledged application payload as if delivered, and uninitialized `data_fin`/`dsn64`/`data_seq` set `msk-\u003ercv_data_fin_seq` to a bogus value that forces a spurious EOF. This is uncontrolled modification of kernel connection state that silently corrupts and truncates the delivered data stream, plus corruption of socket memory accounting via `dfrag_uncharge()`.\nA:H - Corrupting `snd_una`/`wnd_end`/`rcv_data_fin_seq` from garbage stalls, aborts, or prevents termination of MPTCP connections, and the spurious sequence advance reaches the `WARN_ON_ONCE(!msk-\u003erecovery)` sites in `__mptcp_clean_una()`, which panics the box on kernels built with `panic_on_warn`. The condition is remotely triggerable at will and repeatable across connections."
            }
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        }
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        },
        {
          "url": "https://git.kernel.org/stable/c/3b5332d416d151a15742d1b16e7319368e3cc5c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f6c72b8ef8130760710e337dc8fbe7263954884"
        },
        {
          "url": "https://git.kernel.org/stable/c/6169e942370b4b6f9442d35c51519bf6c346843b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba0518f9e8688cd4fcb569e8df2a74874b4f3894"
        },
        {
          "url": "https://git.kernel.org/stable/c/c86b000782daba926c627d2fa00c3f60a75e7472"
        }
      ],
      "title": "mptcp: consolidate suboption status",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21707",
    "datePublished": "2025-02-27T02:07:21.084Z",
    "dateReserved": "2024-12-29T08:45:45.751Z",
    "dateUpdated": "2026-08-05T11:53:47.362Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-21707",
      "date": "2026-08-05",
      "epss": "0.00466",
      "percentile": "0.37954"
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-18T01:41:22.000Z",
      "cve": "CVE-2025-21707",
      "id": "msrc_CVE-2025-21707",
      "initial_release_date": "2025-02-02T00:00:00.000Z",
      "product_status:fixed": "5",
      "product_status:known_affected": "5",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "mptcp: consolidate suboption status",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-21707.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21707\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-27T02:15:14.347\",\"lastModified\":\"2026-07-30T06:20:02.923\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mptcp: consolidar el estado de las subopciones MPTCP mantiene el estado de las subopciones recibidas en la m\u00e1scara de bits que contiene las subopciones recibidas y en varios campos de bits que contienen informaci\u00f3n adicional por subopci\u00f3n. Poner a cero la m\u00e1scara de bits antes del an\u00e1lisis no es suficiente para garantizar un estado consistente, y el c\u00f3digo MPTCP tiene que borrar adicionalmente algunos campos de bits seg\u00fan la subopci\u00f3n analizada en realidad. El esquema anterior es fr\u00e1gil y syzbot logr\u00f3 activar una ruta donde un campo de bits relevante no se borra/inicializa: ERROR: KMSAN: uninit-value in __mptcp_expand_seq net/mptcp/options.c:1030 [inline] BUG: KMSAN: uninit-value in mptcp_expand_seq net/mptcp/protocol.h:864 [inline] BUG: KMSAN: uninit-value in ack_update_msk net/mptcp/options.c:1060 [inline] BUG: KMSAN: uninit-value in mptcp_incoming_options+0x2036/0x3d30 net/mptcp/options.c:1209 __mptcp_expand_seq net/mptcp/options.c:1030 [inline] mptcp_expand_seq net/mptcp/protocol.h:864 [inline] ack_update_msk net/mptcp/options.c:1060 [inline] mptcp_incoming_options+0x2036/0x3d30 net/mptcp/options.c:1209 tcp_data_queue+0xb4/0x7be0 net/ipv4/tcp_input.c:5233 tcp_rcv_established+0x1061/0x2510 net/ipv4/tcp_input.c:6264 tcp_v4_do_rcv+0x7f3/0x11a0 net/ipv4/tcp_ipv4.c:1916 tcp_v4_rcv+0x51df/0x5750 net/ipv4/tcp_ipv4.c:2351 ip_protocol_deliver_rcu+0x2a3/0x13d0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x336/0x500 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish+0x4a2/0x520 net/ipv4/ip_input.c:447 NF_HOOK include/linux/netfilter.h:314 [inline] ip_rcv+0xcd/0x380 net/ipv4/ip_input.c:567 __netif_receive_skb_one_core net/core/dev.c:5704 [inline] __netif_receive_skb+0x319/0xa00 net/core/dev.c:5817 process_backlog+0x4ad/0xa50 net/core/dev.c:6149 __napi_poll+0xe7/0x980 net/core/dev.c:6902 napi_poll net/core/dev.c:6971 [inline] net_rx_action+0xa5a/0x19b0 net/core/dev.c:7093 handle_softirqs+0x1a0/0x7c0 kernel/softirq.c:561 __do_softirq+0x14/0x1a kernel/softirq.c:595 do_softirq+0x9a/0x100 kernel/softirq.c:462 __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:389 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline] __dev_queue_xmit+0x2758/0x57d0 net/core/dev.c:4493 dev_queue_xmit include/linux/netdevice.h:3168 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236 __ip_finish_output+0x287/0x810 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434 dst_output include/net/dst.h:450 [inline] ip_local_out net/ipv4/ip_output.c:130 [inline] __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1468 tcp_transmit_skb net/ipv4/tcp_output.c:1486 [inline] tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2829 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3012 tcp_send_fin+0x9f6/0xf50 net/ipv4/tcp_output.c:3618 __tcp_close+0x140c/0x1550 net/ipv4/tcp.c:3130 __mptcp_close_ssk+0x74e/0x16f0 net/mptcp/protocol.c:2496 mptcp_close_ssk+0x26b/0x2c0 net/mptcp/protocol.c:2550 mptcp_pm_nl_rm_addr_or_subflow+0x635/0xd10 net/mptcp/pm_netlink.c:889 mptcp_pm_nl_rm_subflow_received net/mptcp/pm_netlink.c:924 [inline] mptcp_pm_flush_addrs_and_subflows net/mptcp/pm_netlink.c:1688 [inline] mptcp_nl_flush_addrs_list net/mptcp/pm_netlink.c:1709 [inline] mptcp_pm_nl_flush_addrs_doit+0xe10/0x1630 net/mptcp/pm_netlink.c:1750 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] ---truncated--- \"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/mptcp/options.c\",\"net/mptcp/protocol.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc\",\"lessThan\":\"3a7fda57b0f91f7ea34476b165f91a92feb17c96\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc\",\"lessThan\":\"3b5332d416d151a15742d1b16e7319368e3cc5c6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc\",\"lessThan\":\"7f6c72b8ef8130760710e337dc8fbe7263954884\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc\",\"lessThan\":\"6169e942370b4b6f9442d35c51519bf6c346843b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc\",\"lessThan\":\"ba0518f9e8688cd4fcb569e8df2a74874b4f3894\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84dfe3677a6f45b3d0dfdd564e55717a1a5e60cc\",\"lessThan\":\"c86b000782daba926c627d2fa00c3f60a75e7472\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/mptcp/options.c\",\"net/mptcp/protocol.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.179\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.129\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.76\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.13\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.2\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"6.1.129\",\"matchCriteriaId\":\"E7C7BC17-DCB7-4AF7-B2AC-D9F9FF68A027\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.76\",\"matchCriteriaId\":\"A6D70701-9CB6-4222-A957-00A419878993\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.13\",\"matchCriteriaId\":\"2897389C-A8C3-4D69-90F2-E701B3D66373\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.2\",\"matchCriteriaId\":\"6D4116B1-1BFD-4F23-BA84-169CC05FC5A3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3a7fda57b0f91f7ea34476b165f91a92feb17c96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3b5332d416d151a15742d1b16e7319368e3cc5c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6169e942370b4b6f9442d35c51519bf6c346843b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7f6c72b8ef8130760710e337dc8fbe7263954884\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ba0518f9e8688cd4fcb569e8df2a74874b4f3894\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c86b000782daba926c627d2fa00c3f60a75e7472\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:39:23+00:00",
      "cve": "CVE-2025-21707",
      "id": "CVE-2025-21707",
      "initial_release_date": "2025-02-27T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mptcp: consolidate suboption status",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21707.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.