CVE-2025-71144 (GCVE-0-2025-71144)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:08 – Updated: 2026-02-19 15:39
VLAI?
Title
mptcp: ensure context reset on disconnect()
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: ensure context reset on disconnect() After the blamed commit below, if the MPC subflow is already in TCP_CLOSE status or has fallback to TCP at mptcp_disconnect() time, mptcp_do_fastclose() skips setting the `send_fastclose flag` and the later __mptcp_close_ssk() does not reset anymore the related subflow context. Any later connection will be created with both the `request_mptcp` flag and the msk-level fallback status off (it is unconditionally cleared at MPTCP disconnect time), leading to a warning in subflow_data_ready(): WARNING: CPU: 26 PID: 8996 at net/mptcp/subflow.c:1519 subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13)) Modules linked in: CPU: 26 UID: 0 PID: 8996 Comm: syz.22.39 Not tainted 6.18.0-rc7-05427-g11fc074f6c36 #1 PREEMPT(voluntary) Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 RIP: 0010:subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13)) Code: 90 0f 0b 90 90 e9 04 fe ff ff e8 b7 1e f5 fe 89 ee bf 07 00 00 00 e8 db 19 f5 fe 83 fd 07 0f 84 35 ff ff ff e8 9d 1e f5 fe 90 <0f> 0b 90 e9 27 ff ff ff e8 8f 1e f5 fe 4c 89 e7 48 89 de e8 14 09 RSP: 0018:ffffc9002646fb30 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88813b218000 RCX: ffffffff825c8435 RDX: ffff8881300b3580 RSI: ffffffff825c8443 RDI: 0000000000000005 RBP: 000000000000000b R08: ffffffff825c8435 R09: 000000000000000b R10: 0000000000000005 R11: 0000000000000007 R12: ffff888131ac0000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f88330af6c0(0000) GS:ffff888a93dd2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f88330aefe8 CR3: 000000010ff59000 CR4: 0000000000350ef0 Call Trace: <TASK> tcp_data_ready (net/ipv4/tcp_input.c:5356) tcp_data_queue (net/ipv4/tcp_input.c:5445) tcp_rcv_state_process (net/ipv4/tcp_input.c:7165) tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1955) __release_sock (include/net/sock.h:1158 (discriminator 6) net/core/sock.c:3180 (discriminator 6)) release_sock (net/core/sock.c:3737) mptcp_sendmsg (net/mptcp/protocol.c:1763 net/mptcp/protocol.c:1857) inet_sendmsg (net/ipv4/af_inet.c:853 (discriminator 7)) __sys_sendto (net/socket.c:727 (discriminator 15) net/socket.c:742 (discriminator 15) net/socket.c:2244 (discriminator 15)) __x64_sys_sendto (net/socket.c:2247) do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1)) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) RIP: 0033:0x7f883326702d Address the issue setting an explicit `fastclosing` flag at fastclose time, and checking such flag after mptcp_do_fastclose().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9ea05fabce31ff93a0adae8221c58bc6d7b832f3 , < 226fff52e7ed9fc8cd63327133739b3d92537ffd (git)
Affected: 3a13454fd098ed51e733958488f8ec62859a9ed8 , < 5c7c7135468f3fc6379cde9777a2c18bfe92d82f (git)
Affected: f6fb2cbc91a81178dea23d463503b4525a76825d , < 1c7c3a9314d8a7fc0e9a508606466a967c8e774a (git)
Affected: ae155060247be8dcae3802a95bd1bdf93ab3215d , < f1a77dfc3b045c3dd5f6e64189b9f52b90399f07 (git)
Affected: ae155060247be8dcae3802a95bd1bdf93ab3215d , < 86730ac255b0497a272704de9a1df559f5d6602e (git)
Affected: c4f7b0916b95fd2226e5ab98882482b08f52e1c0 (git)
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    Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.1.164 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.65 , ≤ 6.12.* (semver)
Unaffected: 6.18.5 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: ensure context reset on disconnect()\n\nAfter the blamed commit below, if the MPC subflow is already in TCP_CLOSE\nstatus or has fallback to TCP at mptcp_disconnect() time,\nmptcp_do_fastclose() skips setting the `send_fastclose flag` and the later\n__mptcp_close_ssk() does not reset anymore the related subflow context.\n\nAny later connection will be created with both the `request_mptcp` flag\nand the msk-level fallback status off (it is unconditionally cleared at\nMPTCP disconnect time), leading to a warning in subflow_data_ready():\n\n  WARNING: CPU: 26 PID: 8996 at net/mptcp/subflow.c:1519 subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))\n  Modules linked in:\n  CPU: 26 UID: 0 PID: 8996 Comm: syz.22.39 Not tainted 6.18.0-rc7-05427-g11fc074f6c36 #1 PREEMPT(voluntary)\n  Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011\n  RIP: 0010:subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))\n  Code: 90 0f 0b 90 90 e9 04 fe ff ff e8 b7 1e f5 fe 89 ee bf 07 00 00 00 e8 db 19 f5 fe 83 fd 07 0f 84 35 ff ff ff e8 9d 1e f5 fe 90 \u003c0f\u003e 0b 90 e9 27 ff ff ff e8 8f 1e f5 fe 4c 89 e7 48 89 de e8 14 09\n  RSP: 0018:ffffc9002646fb30 EFLAGS: 00010293\n  RAX: 0000000000000000 RBX: ffff88813b218000 RCX: ffffffff825c8435\n  RDX: ffff8881300b3580 RSI: ffffffff825c8443 RDI: 0000000000000005\n  RBP: 000000000000000b R08: ffffffff825c8435 R09: 000000000000000b\n  R10: 0000000000000005 R11: 0000000000000007 R12: ffff888131ac0000\n  R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n  FS:  00007f88330af6c0(0000) GS:ffff888a93dd2000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f88330aefe8 CR3: 000000010ff59000 CR4: 0000000000350ef0\n  Call Trace:\n   \u003cTASK\u003e\n   tcp_data_ready (net/ipv4/tcp_input.c:5356)\n   tcp_data_queue (net/ipv4/tcp_input.c:5445)\n   tcp_rcv_state_process (net/ipv4/tcp_input.c:7165)\n   tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1955)\n   __release_sock (include/net/sock.h:1158 (discriminator 6) net/core/sock.c:3180 (discriminator 6))\n   release_sock (net/core/sock.c:3737)\n   mptcp_sendmsg (net/mptcp/protocol.c:1763 net/mptcp/protocol.c:1857)\n   inet_sendmsg (net/ipv4/af_inet.c:853 (discriminator 7))\n   __sys_sendto (net/socket.c:727 (discriminator 15) net/socket.c:742 (discriminator 15) net/socket.c:2244 (discriminator 15))\n   __x64_sys_sendto (net/socket.c:2247)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n  RIP: 0033:0x7f883326702d\n\nAddress the issue setting an explicit `fastclosing` flag at fastclose\ntime, and checking such flag after mptcp_do_fastclose()."
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        "dateUpdated": "2026-02-19T15:39:23.482Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71144",
    "datePublished": "2026-01-14T15:08:56.700Z",
    "dateReserved": "2026-01-13T15:30:19.661Z",
    "dateUpdated": "2026-02-19T15:39:23.482Z",
    "state": "PUBLISHED"
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      "date": "2026-05-01",
      "epss": "0.00025",
      "percentile": "0.07011"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-71144\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-14T15:16:04.223\",\"lastModified\":\"2026-02-26T18:41:23.727\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmptcp: ensure context reset on disconnect()\\n\\nAfter the blamed commit below, if the MPC subflow is already in TCP_CLOSE\\nstatus or has fallback to TCP at mptcp_disconnect() time,\\nmptcp_do_fastclose() skips setting the `send_fastclose flag` and the later\\n__mptcp_close_ssk() does not reset anymore the related subflow context.\\n\\nAny later connection will be created with both the `request_mptcp` flag\\nand the msk-level fallback status off (it is unconditionally cleared at\\nMPTCP disconnect time), leading to a warning in subflow_data_ready():\\n\\n  WARNING: CPU: 26 PID: 8996 at net/mptcp/subflow.c:1519 subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))\\n  Modules linked in:\\n  CPU: 26 UID: 0 PID: 8996 Comm: syz.22.39 Not tainted 6.18.0-rc7-05427-g11fc074f6c36 #1 PREEMPT(voluntary)\\n  Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011\\n  RIP: 0010:subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))\\n  Code: 90 0f 0b 90 90 e9 04 fe ff ff e8 b7 1e f5 fe 89 ee bf 07 00 00 00 e8 db 19 f5 fe 83 fd 07 0f 84 35 ff ff ff e8 9d 1e f5 fe 90 \u003c0f\u003e 0b 90 e9 27 ff ff ff e8 8f 1e f5 fe 4c 89 e7 48 89 de e8 14 09\\n  RSP: 0018:ffffc9002646fb30 EFLAGS: 00010293\\n  RAX: 0000000000000000 RBX: ffff88813b218000 RCX: ffffffff825c8435\\n  RDX: ffff8881300b3580 RSI: ffffffff825c8443 RDI: 0000000000000005\\n  RBP: 000000000000000b R08: ffffffff825c8435 R09: 000000000000000b\\n  R10: 0000000000000005 R11: 0000000000000007 R12: ffff888131ac0000\\n  R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\\n  FS:  00007f88330af6c0(0000) GS:ffff888a93dd2000(0000) knlGS:0000000000000000\\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n  CR2: 00007f88330aefe8 CR3: 000000010ff59000 CR4: 0000000000350ef0\\n  Call Trace:\\n   \u003cTASK\u003e\\n   tcp_data_ready (net/ipv4/tcp_input.c:5356)\\n   tcp_data_queue (net/ipv4/tcp_input.c:5445)\\n   tcp_rcv_state_process (net/ipv4/tcp_input.c:7165)\\n   tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1955)\\n   __release_sock (include/net/sock.h:1158 (discriminator 6) net/core/sock.c:3180 (discriminator 6))\\n   release_sock (net/core/sock.c:3737)\\n   mptcp_sendmsg (net/mptcp/protocol.c:1763 net/mptcp/protocol.c:1857)\\n   inet_sendmsg (net/ipv4/af_inet.c:853 (discriminator 7))\\n   __sys_sendto (net/socket.c:727 (discriminator 15) net/socket.c:742 (discriminator 15) net/socket.c:2244 (discriminator 15))\\n   __x64_sys_sendto (net/socket.c:2247)\\n   do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\\n  RIP: 0033:0x7f883326702d\\n\\nAddress the issue setting an explicit `fastclosing` flag at fastclose\\ntime, and checking such flag after mptcp_do_fastclose().\"}],\"metrics\":{\"cvssMetricV31\":[{\"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\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.159\",\"versionEndExcluding\":\"6.1.164\",\"matchCriteriaId\":\"D3726387-AF50-44DE-815B-1A6D1540BA37\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12.60\",\"versionEndExcluding\":\"6.12.65\",\"matchCriteriaId\":\"DA8B3A36-C658-4562-AA47-7FD1228380DA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.17.10\",\"versionEndExcluding\":\"6.18\",\"matchCriteriaId\":\"AC4D9A16-72F2-4CA3-A8F5-80DD12FD7626\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.18.1\",\"versionEndExcluding\":\"6.18.5\",\"matchCriteriaId\":\"FC10B9C3-37AA-4674-94E9-42060AD7B02E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.6.119:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"6032EB9F-DBC1-4563-9C01-D603E01ACD9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.18:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"DCE57113-2223-4308-A0F2-5E6ECFBB3C23\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.18:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"38C4D89F-9A13-4D29-8645-C9785C142C07\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1c7c3a9314d8a7fc0e9a508606466a967c8e774a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/226fff52e7ed9fc8cd63327133739b3d92537ffd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5c7c7135468f3fc6379cde9777a2c18bfe92d82f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/86730ac255b0497a272704de9a1df559f5d6602e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f1a77dfc3b045c3dd5f6e64189b9f52b90399f07\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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