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CVE-2024-56633

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

tcp_bpf: Fix the sk_mem_uncharge logic in tcp_bpf_sendmsg

The current sk memory accounting logic in __SK_REDIRECT is pre-uncharging tosend bytes, which is either msg->sg.size or a smaller value apply_bytes.

Potential problems with this strategy are as follows:

When running the selftest test_txmsg_redir_wait_sndmem with txmsg_apply, the following warning will be reported:

In __SK_REDIRECT, a more concise way is delaying the uncharging after sent bytes are finalized, and uncharge this value. When (ret < 0), we shall invoke sk_msg_free.

Leer descripción completaMostrar menos

Same thing happens in case __SK_DROP, when tosend is set to apply_bytes, we may miss uncharging (msg->sg.size - apply_bytes) bytes. The same warning will be reported in selftest.

So instead of sk_msg_free_partial we can do sk_msg_free here.

Detalles técnicos trazas, registros y código del informe original
- If the actual sent bytes are smaller than tosend, we need to charge some
  bytes back, as in line 487, which is okay but seems not clean.

- When tosend is set to apply_bytes, as in line 417, and (ret < 0), we may
  miss uncharging (msg->sg.size - apply_bytes) bytes.

[...]
415 tosend = msg->sg.size;
416 if (psock->apply_bytes && psock->apply_bytes < tosend)
417   tosend = psock->apply_bytes;
[...]
443 sk_msg_return(sk, msg, tosend);
444 release_sock(sk);
446 origsize = msg->sg.size;
447 ret = tcp_bpf_sendmsg_redir(sk_redir, redir_ingress,
448                             msg, tosend, flags);
449 sent = origsize - msg->sg.size;
[...]
454 lock_sock(sk);
455 if (unlikely(ret < 0)) {
456   int free = sk_msg_free_nocharge(sk, msg);
458   if (!cork)
459     *copied -= free;
460 }
[...]
487 if (eval == __SK_REDIRECT)
488   sk_mem_charge(sk, tosend - sent);
[...]

------------[ cut here ]------------
WARNING: CPU: 6 PID: 57 at net/ipv4/af_inet.c:156 inet_sock_destruct+0x190/0x1a0
Modules linked in:
CPU: 6 UID: 0 PID: 57 Comm: kworker/6:0 Not tainted 6.12.0-rc1.bm.1-amd64+ #43
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Workqueue: events sk_psock_destroy
RIP: 0010:inet_sock_destruct+0x190/0x1a0
RSP: 0018:ffffad0a8021fe08 EFLAGS: 00010206
RAX: 0000000000000011 RBX: ffff9aab4475b900 RCX: ffff9aab481a0800
RDX: 0000000000000303 RSI: 0000000000000011 RDI: ffff9aab4475b900
RBP: ffff9aab4475b990 R08: 0000000000000000 R09: ffff9aab40050ec0
R10: 0000000000000000 R11: ffff9aae6fdb1d01 R12: ffff9aab49c60400
R13: ffff9aab49c60598 R14: ffff9aab49c60598 R15: dead000000000100
FS:  0000000000000000(0000) GS:ffff9aae6fd80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffec7e47bd8 CR3: 00000001a1a1c004 CR4: 0000000000770ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
<TASK>
? __warn+0x89/0x130
? inet_sock_destruct+0x190/0x1a0
? report_bug+0xfc/0x1e0
? handle_bug+0x5c/0xa0
? exc_invalid_op+0x17/0x70
? asm_exc_invalid_op+0x1a/0x20
? inet_sock_destruct+0x190/0x1a0
__sk_destruct+0x25/0x220
sk_psock_destroy+0x2b2/0x310
process_scheduled_works+0xa3/0x3e0
worker_thread+0x117/0x240
? __pfx_worker_thread+0x10/0x10
kthread+0xcf/0x100
? __pfx_kthread+0x10/0x10
ret_from_fork+0x31/0x40
? __pfx_kthread+0x10/0x10
ret_from_fork_asm+0x1a/0x30
</TASK>
---[ end trace 0000000000000000 ]---

[...]
468 case __SK_DROP:
469 default:
470 sk_msg_free_partial(sk, msg, tosend);
471 sk_msg_apply_bytes(psock, tosend);
472 *copied -= (tosend + delta);
473 return -EACCES;
[...]

CVSS

Probabilidad de explotación (EPSS)

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de escalada de privilegios local en kernel Linux (AV:L, PR:L) con acceso local sin interacción. Los impactos incluyen DoS por consumo de memoria y corrupción de datos en contabilidad de sockets.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2024-56633",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
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              "lessThan": "905d82e6e77d16ec3e089c92b7b59a14899dfc1a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
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              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
              "lessThan": "0d6cd1151e26fc7c2d5daa85e8984aaa685a1a12",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
              "lessThan": "456f08d24afa51b5eb816c42e4ca1c44a247bd42",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
              "lessThan": "206d56f41a1509cadd06e2178c26cb830e45057d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
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              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
              "lessThan": "ca70b8baf2bd125b2a4d96e76db79375c07d7ff2",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/ipv4/tcp_bpf.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.20"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.20",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.4.287",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.231",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.174",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.120",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.66",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.5",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/ipv4/tcp_bpf.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2024-12-27T15:15:22.933",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0d6cd1151e26fc7c2d5daa85e8984aaa685a1a12",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/206d56f41a1509cadd06e2178c26cb830e45057d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/456f08d24afa51b5eb816c42e4ca1c44a247bd42",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5c9e3bb43a354a2245caebbbbb4a5b8c034fdd56",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/905d82e6e77d16ec3e089c92b7b59a14899dfc1a",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ca70b8baf2bd125b2a4d96e76db79375c07d7ff2",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dbedc7e142df5ea238a46fdd7462c1c42cd36a10",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp_bpf: Fix the sk_mem_uncharge logic in tcp_bpf_sendmsg\n\nThe current sk memory accounting logic in __SK_REDIRECT is pre-uncharging\ntosend bytes, which is either msg->sg.size or a smaller value apply_bytes.\n\nPotential problems with this strategy are as follows:\n\n- If the actual sent bytes are smaller than tosend, we need to charge some\n  bytes back, as in line 487, which is okay but seems not clean.\n\n- When tosend is set to apply_bytes, as in line 417, and (ret < 0), we may\n  miss uncharging (msg->sg.size - apply_bytes) bytes.\n\n[...]\n415 tosend = msg->sg.size;\n416 if (psock->apply_bytes && psock->apply_bytes < tosend)\n417   tosend = psock->apply_bytes;\n[...]\n443 sk_msg_return(sk, msg, tosend);\n444 release_sock(sk);\n446 origsize = msg->sg.size;\n447 ret = tcp_bpf_sendmsg_redir(sk_redir, redir_ingress,\n448                             msg, tosend, flags);\n449 sent = origsize - msg->sg.size;\n[...]\n454 lock_sock(sk);\n455 if (unlikely(ret < 0)) {\n456   int free = sk_msg_free_nocharge(sk, msg);\n458   if (!cork)\n459     *copied -= free;\n460 }\n[...]\n487 if (eval == __SK_REDIRECT)\n488   sk_mem_charge(sk, tosend - sent);\n[...]\n\nWhen running the selftest test_txmsg_redir_wait_sndmem with txmsg_apply,\nthe following warning will be reported:\n\n------------[ cut here ]------------\nWARNING: CPU: 6 PID: 57 at net/ipv4/af_inet.c:156 inet_sock_destruct+0x190/0x1a0\nModules linked in:\nCPU: 6 UID: 0 PID: 57 Comm: kworker/6:0 Not tainted 6.12.0-rc1.bm.1-amd64+ #43\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014\nWorkqueue: events sk_psock_destroy\nRIP: 0010:inet_sock_destruct+0x190/0x1a0\nRSP: 0018:ffffad0a8021fe08 EFLAGS: 00010206\nRAX: 0000000000000011 RBX: ffff9aab4475b900 RCX: ffff9aab481a0800\nRDX: 0000000000000303 RSI: 0000000000000011 RDI: ffff9aab4475b900\nRBP: ffff9aab4475b990 R08: 0000000000000000 R09: ffff9aab40050ec0\nR10: 0000000000000000 R11: ffff9aae6fdb1d01 R12: ffff9aab49c60400\nR13: ffff9aab49c60598 R14: ffff9aab49c60598 R15: dead000000000100\nFS:  0000000000000000(0000) GS:ffff9aae6fd80000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ffec7e47bd8 CR3: 00000001a1a1c004 CR4: 0000000000770ef0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nPKRU: 55555554\nCall Trace:\n<TASK>\n? __warn+0x89/0x130\n? inet_sock_destruct+0x190/0x1a0\n? report_bug+0xfc/0x1e0\n? handle_bug+0x5c/0xa0\n? exc_invalid_op+0x17/0x70\n? asm_exc_invalid_op+0x1a/0x20\n? inet_sock_destruct+0x190/0x1a0\n__sk_destruct+0x25/0x220\nsk_psock_destroy+0x2b2/0x310\nprocess_scheduled_works+0xa3/0x3e0\nworker_thread+0x117/0x240\n? __pfx_worker_thread+0x10/0x10\nkthread+0xcf/0x100\n? __pfx_kthread+0x10/0x10\nret_from_fork+0x31/0x40\n? __pfx_kthread+0x10/0x10\nret_from_fork_asm+0x1a/0x30\n</TASK>\n---[ end trace 0000000000000000 ]---\n\nIn __SK_REDIRECT, a more concise way is delaying the uncharging after sent\nbytes are finalized, and uncharge this value. When (ret < 0), we shall\ninvoke sk_msg_free.\n\nSame thing happens in case __SK_DROP, when tosend is set to apply_bytes,\nwe may miss uncharging (msg->sg.size - apply_bytes) bytes. The same\nwarning will be reported in selftest.\n\n[...]\n468 case __SK_DROP:\n469 default:\n470 sk_msg_free_partial(sk, msg, tosend);\n471 sk_msg_apply_bytes(psock, tosend);\n472 *copied -= (tosend + delta);\n473 return -EACCES;\n[...]\n\nSo instead of sk_msg_free_partial we can do sk_msg_free here."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp_bpf: Arreglar la lógica sk_mem_uncharge en tcp_bpf_sendmsg La lógica actual de contabilidad de memoria sk en __SK_REDIRECT está pre-descargando bytes tosend, que es msg-&gt;sg.size o un valor menor apply_bytes. Los problemas potenciales con esta estrategia son los siguientes: - Si los bytes enviados reales son más pequeños que tosend, necesitamos cargar algunos bytes de vuelta, como en la línea 487, lo cual está bien pero no parece limpio. - Cuando tosend está configurado en apply_bytes, como en la línea 417, y (ret &lt; 0), podemos perder la descarga de (msg-&gt;sg.size - apply_bytes) bytes. [...] 415 tosend = msg-&gt;sg.size; 416 si (psock-&gt;aplicar_bytes &amp;&amp; psock-&gt;aplicar_bytes &lt; para enviar) 417 para enviar = psock-&gt;aplicar_bytes; [...] 443 sk_msg_return(sk, msg, para enviar); 444 release_sock(sk); 446 tamaño original = msg-&gt;sg.tamaño; 447 ret = tcp_bpf_sendmsg_redir(sk_redir, redir_ingress, 448 msg, para enviar, indicadores); 449 enviado = tamaño original - msg-&gt;sg.tamaño; [...] 454 bloqueo_sock(sk); 455 si (improbable(ret &lt; 0)) { 456 int libre = sk_msg_libre_sincarga(sk, msg); 458 si (!corcho) 459 *copiado -= libre; 460 } [...] 487 si (eval == __SK_REDIRECT) 488 sk_mem_charge(sk, tosend - enviado); [...] Al ejecutar la prueba automática test_txmsg_redir_wait_sndmem con txmsg_apply, se informará la siguiente advertencia: ------------[ cortar aquí ]------------ ADVERTENCIA: CPU: 6 PID: 57 en net/ipv4/af_inet.c:156 inet_sock_destruct+0x190/0x1a0 Módulos vinculados: CPU: 6 UID: 0 PID: 57 Comm: kworker/6:0 No contaminado 6.12.0-rc1.bm.1-amd64+ #43 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Cola de trabajo: eventos sk_psock_destroy RIP: 0010:inet_sock_destruct+0x190/0x1a0 RSP: 0018:ffffad0a8021fe08 EFLAGS: 00010206 RAX: 0000000000000011 RBX: ffff9aab4475b900 RCX: ffff9aab481a0800 RDX: 0000000000000303 RSI: 0000000000000011 RDI: ffff9aab4475b900 RBP: ffff9aab4475b990 R08: 0000000000000000 R09: ffff9aab40050ec0 R10: 0000000000000000 R11: ffff9aae6fdb1d01 R12: ffff9aab49c60400 R13: ffff9aab49c60598 R14: ffff9aab49c60598 R15: muerto000000000100 FS: 000000000000000(0000) GS:ffff9aae6fd80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffec7e47bd8 CR3: 00000001a1a1c004 CR4: 0000000000770ef0 DR0: 00000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Seguimiento de llamadas:  ? __warn+0x89/0x130 ? inet_sock_destruct+0x190/0x1a0 ? report_bug+0xfc/0x1e0 ? handle_bug+0x5c/0xa0 ? exc_invalid_op+0x17/0x70 ? asm_exc_invalid_op+0x1a/0x20 ? inet_sock_destruct+0x190/0x1a0 __sk_destruct+0x25/0x220 sk_psock_destroy+0x2b2/0x310 proceso_trabajos_programados+0xa3/0x3e0 subproceso_trabajador+0x117/0x240 ? __pfx_worker_thread+0x10/0x10 kthread+0xcf/0x100 ? __pfx_kthread+0x10/0x10 ret_de_bifurcación+0x31/0x40 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30  ---[ fin del seguimiento 000000000000000 ]--- En __SK_REDIRECT, una forma más concisa es retrasar la descarga después de que se finalizan los bytes enviados y descargar este valor. Cuando (ret &lt; 0), invocaremos sk_msg_free. Lo mismo sucede en el caso __SK_DROP, cuando tosend se establece en apply_bytes, podemos perder la descarga de (msg-&gt;sg.size - apply_bytes) bytes. La misma advertencia se informará en la autoprueba. [...] 468 caso __SK_DROP: 469 predeterminado: 470 sk_msg_free_partial(sk, msg, tosend); 471 sk_msg_apply_bytes(psock, tosend); 472 *copied -= (tosend + delta); 473 return -EACCES; [...] Entonces, en lugar de sk_msg_free_partial, podemos hacer sk_msg_free aquí."
    }
  ],
  "lastModified": "2026-06-17T08:12:36.133",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E4B15788-D35E-4E5B-A9C0-070AE3729B34",
              "versionEndExcluding": "5.4.287",
              "versionStartIncluding": "4.20"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B5C644CC-2BD7-4E32-BC54-8DCC7ABE9935",
              "versionEndExcluding": "5.10.231",
              "versionStartIncluding": "5.5"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "419FD073-1517-4FD5-8158-F94BC68A1E89",
              "versionEndExcluding": "5.15.174",
              "versionStartIncluding": "5.11"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "09AC6122-E2A4-40FE-9D33-268A1B2EC265",
              "versionEndExcluding": "6.1.120",
              "versionStartIncluding": "5.16"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "29A976AD-B9AB-4A95-9F08-7669F8847EB9",
              "versionEndExcluding": "6.6.66",
              "versionStartIncluding": "6.2"
            },
            {
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              "vulnerable": true,
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