CVE-2024-36889

Estado: AnalizadaMedia (5.5)—

Detalles técnicos trazas, registros y código del informe original

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mptcp: asegúrese de que snd_nxt se inicialice correctamente al conectar Christoph informó un símbolo que indica un snd_una dañado: ADVERTENCIA: CPU: 1 PID: 38 en net/mptcp/protocol.c:1005 __mptcp_clean_una +0x4b3/0x620 net/mptcp/protocol.c:1005 Módulos vinculados en: CPU: 1 PID: 38 Comm: kworker/1:1 No contaminado 6.9.0-rc1-gbbeac67456c9 #59 Nombre del hardware: PC estándar QEMU (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 01/04/2014 Cola de trabajo: eventos mptcp_worker RIP: 0010:__mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005 Código: be 06 01 00 00 bf 06 01 00 00 e8 a8 12 e7 fe e9 00 fe ff ff e8 8e 1a e7 fe 0f b7 ab 3e 02 00 00 e9 d3 fd ff ff e8 7d 1a e7 fe &lt;0f&gt; 0b 4c 8b bb e0 05 00 00 e9 74 fc ff ff e8 6a 1a e7 fe 0f 0b e9 RSP: 0018:ffffc9000013fd48 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8881029bd280 RCX: ffffffff82382fe4 RDX: 3cbd00 RSI: ffffffff823833c3 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000000000000 R11: fefefefefefefeff R12 : ffff888138ba8000 R13: 0000000000000106 R14: ffff8881029bd908 R15: ffff888126560000 FS: 00000000000000000(0000) GS:ffff88813bd00000(0000) nlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f604a5dae38 CR3: 0000000101dac002 CR4: 0000000000170ef0 Rastreo de llamadas:  __mptcp_clean_una_wakeup net/mptcp/protocol.c:1055 [en línea] mptcp_clean_una_wakeup net/mptcp/protocol.c:1062 [en línea] __mptcp_retrans+0x7f/0x7e0 net/mptcp/protocol.c:2615 mptcp_worker+0x434/ 0x740 neto/ mptcp/protocol.c:2767 Process_one_work+0x1e0/0x560 kernel/workqueue.c:3254 Process_scheduled_works kernel/workqueue.c:3335 [en línea] work_thread+0x3c7/0x640 kernel/workqueue.c:3416 kthread+0x121/0x170 kernel/kthread .c:388 ret_from_fork+0x44/0x50 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243  Cuando el retorno a TCP ocurre temprano en un socket de cliente , snd_nxt aún no está inicializado y cualquier confirmación entrante copiará dicho valor en snd_una. Si el trabajador mptcp (tontamente) intenta la reinyección a nivel de mptcp después de tal confirmación, eso desencadenaría incondicionalmente una sanitización del búfer de envío utilizando valores snd_una 'incorrectos'. Podríamos desactivar fácilmente la reinyección para los sockets de respaldo, pero un comportamiento tan tonto ya ayudó a detectar algunos problemas sutiles y un impacto de muy bajo a cero en la práctica. En su lugar, resuelva el problema siempre inicializando snd_nxt (y write_seq, para mantener la coherencia) en el momento de la conexión.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.27%
Percentil entre todas las CVEs puntuadas: 17
Fecha de la puntuación: 8/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Debian — Debian Linux Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

Mostrar

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: ensure snd_nxt is properly initialized on connect\n\nChristoph reported a splat hinting at a corrupted snd_una:\n\n  WARNING: CPU: 1 PID: 38 at net/mptcp/protocol.c:1005 __mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005\n  Modules linked in:\n  CPU: 1 PID: 38 Comm: kworker/1:1 Not tainted 6.9.0-rc1-gbbeac67456c9 #59\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014\n  Workqueue: events mptcp_worker\n  RIP: 0010:__mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005\n  Code: be 06 01 00 00 bf 06 01 00 00 e8 a8 12 e7 fe e9 00 fe ff ff e8\n  \t8e 1a e7 fe 0f b7 ab 3e 02 00 00 e9 d3 fd ff ff e8 7d 1a e7 fe\n  \t<0f> 0b 4c 8b bb e0 05 00 00 e9 74 fc ff ff e8 6a 1a e7 fe 0f 0b e9\n  RSP: 0018:ffffc9000013fd48 EFLAGS: 00010293\n  RAX: 0000000000000000 RBX: ffff8881029bd280 RCX: ffffffff82382fe4\n  RDX: ffff8881003cbd00 RSI: ffffffff823833c3 RDI: 0000000000000001\n  RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000\n  R10: 0000000000000000 R11: fefefefefefefeff R12: ffff888138ba8000\n  R13: 0000000000000106 R14: ffff8881029bd908 R15: ffff888126560000\n  FS:  0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f604a5dae38 CR3: 0000000101dac002 CR4: 0000000000170ef0\n  Call Trace:\n   <TASK>\n   __mptcp_clean_una_wakeup net/mptcp/protocol.c:1055 [inline]\n   mptcp_clean_una_wakeup net/mptcp/protocol.c:1062 [inline]\n   __mptcp_retrans+0x7f/0x7e0 net/mptcp/protocol.c:2615\n   mptcp_worker+0x434/0x740 net/mptcp/protocol.c:2767\n   process_one_work+0x1e0/0x560 kernel/workqueue.c:3254\n   process_scheduled_works kernel/workqueue.c:3335 [inline]\n   worker_thread+0x3c7/0x640 kernel/workqueue.c:3416\n   kthread+0x121/0x170 kernel/kthread.c:388\n   ret_from_fork+0x44/0x50 arch/x86/kernel/process.c:147\n   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243\n   </TASK>\n\nWhen fallback to TCP happens early on a client socket, snd_nxt\nis not yet initialized and any incoming ack will copy such value\ninto snd_una. If the mptcp worker (dumbly) tries mptcp-level\nre-injection after such ack, that would unconditionally trigger a send\nbuffer cleanup using 'bad' snd_una values.\n\nWe could easily disable re-injection for fallback sockets, but such\ndumb behavior already helped catching a few subtle issues and a very\nlow to zero impact in practice.\n\nInstead address the issue always initializing snd_nxt (and write_seq,\nfor consistency) at connect time."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mptcp: asegúrese de que snd_nxt se inicialice correctamente al conectar Christoph informó un símbolo que indica un snd_una dañado: ADVERTENCIA: CPU: 1 PID: 38 en net/mptcp/protocol.c:1005 __mptcp_clean_una +0x4b3/0x620 net/mptcp/protocol.c:1005 Módulos vinculados en: CPU: 1 PID: 38 Comm: kworker/1:1 No contaminado 6.9.0-rc1-gbbeac67456c9 #59 Nombre del hardware: PC estándar QEMU (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 01/04/2014 Cola de trabajo: eventos mptcp_worker RIP: 0010:__mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005 Código: be 06 01 00 00 bf 06 01 00 00 e8 a8 12 e7 fe e9 00 fe ff ff e8 8e 1a e7 fe 0f b7 ab 3e 02 00 00 e9 d3 fd ff ff e8 7d 1a e7 fe &lt;0f&gt; 0b 4c 8b bb e0 05 00 00 e9 74 fc ff ff e8 6a 1a e7 fe 0f 0b e9 RSP: 0018:ffffc9000013fd48 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8881029bd280 RCX: ffffffff82382fe4 RDX: 3cbd00 RSI: ffffffff823833c3 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000000000000 R11: fefefefefefefeff R12 : ffff888138ba8000 R13: 0000000000000106 R14: ffff8881029bd908 R15: ffff888126560000 FS: 00000000000000000(0000) GS:ffff88813bd00000(0000) nlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f604a5dae38 CR3: 0000000101dac002 CR4: 0000000000170ef0 Rastreo de llamadas:  __mptcp_clean_una_wakeup net/mptcp/protocol.c:1055 [en línea] mptcp_clean_una_wakeup net/mptcp/protocol.c:1062 [en línea] __mptcp_retrans+0x7f/0x7e0 net/mptcp/protocol.c:2615 mptcp_worker+0x434/ 0x740 neto/ mptcp/protocol.c:2767 Process_one_work+0x1e0/0x560 kernel/workqueue.c:3254 Process_scheduled_works kernel/workqueue.c:3335 [en línea] work_thread+0x3c7/0x640 kernel/workqueue.c:3416 kthread+0x121/0x170 kernel/kthread .c:388 ret_from_fork+0x44/0x50 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243  Cuando el retorno a TCP ocurre temprano en un socket de cliente , snd_nxt aún no está inicializado y cualquier confirmación entrante copiará dicho valor en snd_una. Si el trabajador mptcp (tontamente) intenta la reinyección a nivel de mptcp después de tal confirmación, eso desencadenaría incondicionalmente una sanitización del búfer de envío utilizando valores snd_una 'incorrectos'. Podríamos desactivar fácilmente la reinyección para los sockets de respaldo, pero un comportamiento tan tonto ya ayudó a detectar algunos problemas sutiles y un impacto de muy bajo a cero en la práctica. En su lugar, resuelva el problema siempre inicializando snd_nxt (y write_seq, para mantener la coherencia) en el momento de la conexión."
    }
  ],
  "lastModified": "2026-06-17T07:37:16.990",
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