CVE-2021-47594 (GCVE-0-2021-47594)
Vulnerability from cvelistv5
Published
2024-06-19 14:53
Modified
2026-05-11 13:57
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: never allow the PM to close a listener subflow Currently, when deleting an endpoint the netlink PM treverses all the local MPTCP sockets, regardless of their status. If an MPTCP listener socket is bound to the IP matching the delete endpoint, the listener TCP socket will be closed. That is unexpected, the PM should only affect data subflows. Additionally, syzbot was able to trigger a NULL ptr dereference due to the above: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 PID: 6550 Comm: syz-executor122 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0xd7d/0x54a0 kernel/locking/lockdep.c:4897 Code: 0f 0e 41 be 01 00 00 00 0f 86 c8 00 00 00 89 05 69 cc 0f 0e e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 f3 2f 00 00 48 81 3b 20 75 17 8f 0f 84 52 f3 ff RSP: 0018:ffffc90001f2f818 EFLAGS: 00010016 RAX: dffffc0000000000 RBX: 0000000000000018 RCX: 0000000000000000 RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 000000000000000a R12: 0000000000000000 R13: ffff88801b98d700 R14: 0000000000000000 R15: 0000000000000001 FS: 00007f177cd3d700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f177cd1b268 CR3: 000000001dd55000 CR4: 0000000000350ee0 Call Trace: <TASK> lock_acquire kernel/locking/lockdep.c:5637 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 finish_wait+0xc0/0x270 kernel/sched/wait.c:400 inet_csk_wait_for_connect net/ipv4/inet_connection_sock.c:464 [inline] inet_csk_accept+0x7de/0x9d0 net/ipv4/inet_connection_sock.c:497 mptcp_accept+0xe5/0x500 net/mptcp/protocol.c:2865 inet_accept+0xe4/0x7b0 net/ipv4/af_inet.c:739 mptcp_stream_accept+0x2e7/0x10e0 net/mptcp/protocol.c:3345 do_accept+0x382/0x510 net/socket.c:1773 __sys_accept4_file+0x7e/0xe0 net/socket.c:1816 __sys_accept4+0xb0/0x100 net/socket.c:1846 __do_sys_accept net/socket.c:1864 [inline] __se_sys_accept net/socket.c:1861 [inline] __x64_sys_accept+0x71/0xb0 net/socket.c:1861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f177cd8b8e9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f177cd3d308 EFLAGS: 00000246 ORIG_RAX: 000000000000002b RAX: ffffffffffffffda RBX: 00007f177ce13408 RCX: 00007f177cd8b8e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f177ce13400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f177ce1340c R13: 00007f177cde1004 R14: 6d705f706374706d R15: 0000000000022000 </TASK> Fix the issue explicitly skipping MPTCP socket in TCP_LISTEN status.
References
Impacted products
Vendor Product Version
Linux Linux Version: 740d798e8767d8a449902b1a1bbc70facfce19b5
Version: 740d798e8767d8a449902b1a1bbc70facfce19b5
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                "id": "CVE-2021-47594",
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                "role": "CISA Coordinator",
                "timestamp": "2024-06-21T17:56:53.021423Z",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: never allow the PM to close a listener subflow\n\nCurrently, when deleting an endpoint the netlink PM treverses\nall the local MPTCP sockets, regardless of their status.\n\nIf an MPTCP listener socket is bound to the IP matching the\ndelete endpoint, the listener TCP socket will be closed.\nThat is unexpected, the PM should only affect data subflows.\n\nAdditionally, syzbot was able to trigger a NULL ptr dereference\ndue to the above:\n\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN\nKASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]\nCPU: 1 PID: 6550 Comm: syz-executor122 Not tainted 5.16.0-rc4-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:__lock_acquire+0xd7d/0x54a0 kernel/locking/lockdep.c:4897\nCode: 0f 0e 41 be 01 00 00 00 0f 86 c8 00 00 00 89 05 69 cc 0f 0e e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 \u003c80\u003e 3c 02 00 0f 85 f3 2f 00 00 48 81 3b 20 75 17 8f 0f 84 52 f3 ff\nRSP: 0018:ffffc90001f2f818 EFLAGS: 00010016\nRAX: dffffc0000000000 RBX: 0000000000000018 RCX: 0000000000000000\nRDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000001\nRBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001\nR10: 0000000000000000 R11: 000000000000000a R12: 0000000000000000\nR13: ffff88801b98d700 R14: 0000000000000000 R15: 0000000000000001\nFS:  00007f177cd3d700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f177cd1b268 CR3: 000000001dd55000 CR4: 0000000000350ee0\nCall Trace:\n \u003cTASK\u003e\n lock_acquire kernel/locking/lockdep.c:5637 [inline]\n lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602\n __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162\n finish_wait+0xc0/0x270 kernel/sched/wait.c:400\n inet_csk_wait_for_connect net/ipv4/inet_connection_sock.c:464 [inline]\n inet_csk_accept+0x7de/0x9d0 net/ipv4/inet_connection_sock.c:497\n mptcp_accept+0xe5/0x500 net/mptcp/protocol.c:2865\n inet_accept+0xe4/0x7b0 net/ipv4/af_inet.c:739\n mptcp_stream_accept+0x2e7/0x10e0 net/mptcp/protocol.c:3345\n do_accept+0x382/0x510 net/socket.c:1773\n __sys_accept4_file+0x7e/0xe0 net/socket.c:1816\n __sys_accept4+0xb0/0x100 net/socket.c:1846\n __do_sys_accept net/socket.c:1864 [inline]\n __se_sys_accept net/socket.c:1861 [inline]\n __x64_sys_accept+0x71/0xb0 net/socket.c:1861\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7f177cd8b8e9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f177cd3d308 EFLAGS: 00000246 ORIG_RAX: 000000000000002b\nRAX: ffffffffffffffda RBX: 00007f177ce13408 RCX: 00007f177cd8b8e9\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\nRBP: 00007f177ce13400 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007f177ce1340c\nR13: 00007f177cde1004 R14: 6d705f706374706d R15: 0000000000022000\n \u003c/TASK\u003e\n\nFix the issue explicitly skipping MPTCP socket in TCP_LISTEN\nstatus."
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        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47594",
    "datePublished": "2024-06-19T14:53:56.899Z",
    "dateReserved": "2024-05-24T15:11:00.733Z",
    "dateUpdated": "2026-05-11T13:57:33.709Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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