cve-2021-47590
Vulnerability from cvelistv5
Published
2024-06-19 14:53
Modified
2024-12-19 07:45
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix deadlock in __mptcp_push_pending() __mptcp_push_pending() may call mptcp_flush_join_list() with subflow socket lock held. If such call hits mptcp_sockopt_sync_all() then subsequently __mptcp_sockopt_sync() could try to lock the subflow socket for itself, causing a deadlock. sysrq: Show Blocked State task:ss-server state:D stack: 0 pid: 938 ppid: 1 flags:0x00000000 Call Trace: <TASK> __schedule+0x2d6/0x10c0 ? __mod_memcg_state+0x4d/0x70 ? csum_partial+0xd/0x20 ? _raw_spin_lock_irqsave+0x26/0x50 schedule+0x4e/0xc0 __lock_sock+0x69/0x90 ? do_wait_intr_irq+0xa0/0xa0 __lock_sock_fast+0x35/0x50 mptcp_sockopt_sync_all+0x38/0xc0 __mptcp_push_pending+0x105/0x200 mptcp_sendmsg+0x466/0x490 sock_sendmsg+0x57/0x60 __sys_sendto+0xf0/0x160 ? do_wait_intr_irq+0xa0/0xa0 ? fpregs_restore_userregs+0x12/0xd0 __x64_sys_sendto+0x20/0x30 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f9ba546c2d0 RSP: 002b:00007ffdc3b762d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f9ba56c8060 RCX: 00007f9ba546c2d0 RDX: 000000000000077a RSI: 0000000000e5e180 RDI: 0000000000000234 RBP: 0000000000cc57f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9ba56c8060 R13: 0000000000b6ba60 R14: 0000000000cc7840 R15: 41d8685b1d7901b8 </TASK> Fix the issue by using __mptcp_flush_join_list() instead of plain mptcp_flush_join_list() inside __mptcp_push_pending(), as suggested by Florian. The sockopt sync will be deferred to the workqueue.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/23311b92755ffa9087332d1bb8c71c0f6a10cc08Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d79e3756ca90f7a6087b77b62c1d9c0801e0820Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/23311b92755ffa9087332d1bb8c71c0f6a10cc08Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3d79e3756ca90f7a6087b77b62c1d9c0801e0820Patch
Impacted products
Vendor Product Version
Linux Linux Version: 5.13
Show details on NVD website

To clipboard 

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          "dateUpdated": "2024-08-04T05:39:59.776Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "metrics": [
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                "id": "CVE-2021-47590",
                "options": [
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                    "Automatable": "no"
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                "timestamp": "2024-09-10T17:12:36.639321Z",
                "version": "2.0.3"
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    "cna": {
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          "product": "Linux",
          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix deadlock in __mptcp_push_pending()\n\n__mptcp_push_pending() may call mptcp_flush_join_list() with subflow\nsocket lock held. If such call hits mptcp_sockopt_sync_all() then\nsubsequently __mptcp_sockopt_sync() could try to lock the subflow\nsocket for itself, causing a deadlock.\n\nsysrq: Show Blocked State\ntask:ss-server       state:D stack:    0 pid:  938 ppid:     1 flags:0x00000000\nCall Trace:\n \u003cTASK\u003e\n __schedule+0x2d6/0x10c0\n ? __mod_memcg_state+0x4d/0x70\n ? csum_partial+0xd/0x20\n ? _raw_spin_lock_irqsave+0x26/0x50\n schedule+0x4e/0xc0\n __lock_sock+0x69/0x90\n ? do_wait_intr_irq+0xa0/0xa0\n __lock_sock_fast+0x35/0x50\n mptcp_sockopt_sync_all+0x38/0xc0\n __mptcp_push_pending+0x105/0x200\n mptcp_sendmsg+0x466/0x490\n sock_sendmsg+0x57/0x60\n __sys_sendto+0xf0/0x160\n ? do_wait_intr_irq+0xa0/0xa0\n ? fpregs_restore_userregs+0x12/0xd0\n __x64_sys_sendto+0x20/0x30\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7f9ba546c2d0\nRSP: 002b:00007ffdc3b762d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\nRAX: ffffffffffffffda RBX: 00007f9ba56c8060 RCX: 00007f9ba546c2d0\nRDX: 000000000000077a RSI: 0000000000e5e180 RDI: 0000000000000234\nRBP: 0000000000cc57f0 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007f9ba56c8060\nR13: 0000000000b6ba60 R14: 0000000000cc7840 R15: 41d8685b1d7901b8\n \u003c/TASK\u003e\n\nFix the issue by using __mptcp_flush_join_list() instead of plain\nmptcp_flush_join_list() inside __mptcp_push_pending(), as suggested by\nFlorian. The sockopt sync will be deferred to the workqueue."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47590",
    "datePublished": "2024-06-19T14:53:54.244Z",
    "dateReserved": "2024-05-24T15:11:00.733Z",
    "dateUpdated": "2024-12-19T07:45:21.241Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47590\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-19T15:15:53.610\",\"lastModified\":\"2024-11-21T06:36:37.067\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmptcp: fix deadlock in __mptcp_push_pending()\\n\\n__mptcp_push_pending() may call mptcp_flush_join_list() with subflow\\nsocket lock held. If such call hits mptcp_sockopt_sync_all() then\\nsubsequently __mptcp_sockopt_sync() could try to lock the subflow\\nsocket for itself, causing a deadlock.\\n\\nsysrq: Show Blocked State\\ntask:ss-server       state:D stack:    0 pid:  938 ppid:     1 flags:0x00000000\\nCall Trace:\\n \u003cTASK\u003e\\n __schedule+0x2d6/0x10c0\\n ? __mod_memcg_state+0x4d/0x70\\n ? csum_partial+0xd/0x20\\n ? _raw_spin_lock_irqsave+0x26/0x50\\n schedule+0x4e/0xc0\\n __lock_sock+0x69/0x90\\n ? do_wait_intr_irq+0xa0/0xa0\\n __lock_sock_fast+0x35/0x50\\n mptcp_sockopt_sync_all+0x38/0xc0\\n __mptcp_push_pending+0x105/0x200\\n mptcp_sendmsg+0x466/0x490\\n sock_sendmsg+0x57/0x60\\n __sys_sendto+0xf0/0x160\\n ? do_wait_intr_irq+0xa0/0xa0\\n ? fpregs_restore_userregs+0x12/0xd0\\n __x64_sys_sendto+0x20/0x30\\n do_syscall_64+0x38/0x90\\n entry_SYSCALL_64_after_hwframe+0x44/0xae\\nRIP: 0033:0x7f9ba546c2d0\\nRSP: 002b:00007ffdc3b762d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\\nRAX: ffffffffffffffda RBX: 00007f9ba56c8060 RCX: 00007f9ba546c2d0\\nRDX: 000000000000077a RSI: 0000000000e5e180 RDI: 0000000000000234\\nRBP: 0000000000cc57f0 R08: 0000000000000000 R09: 0000000000000000\\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007f9ba56c8060\\nR13: 0000000000b6ba60 R14: 0000000000cc7840 R15: 41d8685b1d7901b8\\n \u003c/TASK\u003e\\n\\nFix the issue by using __mptcp_flush_join_list() instead of plain\\nmptcp_flush_join_list() inside __mptcp_push_pending(), as suggested by\\nFlorian. The sockopt sync will be deferred to the workqueue.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: mptcp: corrige el punto muerto en __mptcp_push_pending() __mptcp_push_pending() puede llamar a mptcp_flush_join_list() con el bloqueo del socket de subflujo retenido. Si dicha llamada llega a mptcp_sockopt_sync_all(), posteriormente __mptcp_sockopt_sync() podr\u00eda intentar bloquear el socket de subflujo por s\u00ed mismo, provocando un punto muerto. sysrq: Mostrar estado bloqueado tarea: estado del servidor ss: D pila: 0 pid: 938 ppid: 1 banderas: 0x00000000 Seguimiento de llamadas:  __schedule+0x2d6/0x10c0? __mod_memcg_state+0x4d/0x70 ? csum_partial+0xd/0x20? _raw_spin_lock_irqsave+0x26/0x50 horario+0x4e/0xc0 __lock_sock+0x69/0x90 ? do_wait_intr_irq+0xa0/0xa0 __lock_sock_fast+0x35/0x50 mptcp_sockopt_sync_all+0x38/0xc0 __mptcp_push_pending+0x105/0x200 mptcp_sendmsg+0x466/0x490 sock_sendmsg+0x57/0x60 __sys_sendto+0xf0/0x160? do_wait_intr_irq+0xa0/0xa0? fpregs_restore_userregs+0x12/0xd0 __x64_sys_sendto+0x20/0x30 do_syscall_64+0x38/0x90 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f9ba546c2d0 RSP: dc3b762d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f9ba56c8060 RCX: 00007f9ba546c2d0 RDX: 000000000000077a RSI: 0000000000e5e180 RDI: 0000000000000234 RBP: 0000000000cc57f0 R08: 0000000000000000 R09: 00000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9ba56c8060 R13: 0000000000b6ba60 R14: 0000000000cc7840 R15: 41d8685b1d7901b8  Solucione el problema usando __mptcp_flush_join_list() en su lugar de mptcp_flush_join_list() simple dentro __mptcp_push_pending(), como sugiere Florian. La sincronizaci\u00f3n de sockopt se aplazar\u00e1 a la cola de trabajo.\"}],\"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\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.13\",\"versionEndExcluding\":\"5.15.11\",\"matchCriteriaId\":\"D42075C1-1BC2-41C8-B06D-3A7E0EDABE84\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/23311b92755ffa9087332d1bb8c71c0f6a10cc08\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3d79e3756ca90f7a6087b77b62c1d9c0801e0820\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/23311b92755ffa9087332d1bb8c71c0f6a10cc08\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3d79e3756ca90f7a6087b77b62c1d9c0801e0820\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}"
  }
}


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