CVE-2024-56614

Estado: ModificadaAlta (7.8)—

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

xsk: fix OOB map writes when deleting elements

Jordy says:

" In the xsk_map_delete_elem function an unsigned integer (map->max_entries) is compared with a user-controlled signed integer (k). Due to implicit type conversion, a large unsigned value for map->max_entries can bypass the intended bounds check:

This allows k to hold a negative value (between -2147483648 and -2), which is then used as an array index in m->xsk_map[k], which results in an out-of-bounds access.

The xchg operation can then be used to cause an out-of-bounds write. Moreover, the invalid map_entry passed to xsk_map_sock_delete can lead to further memory corruption. "

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It indeed results in following splat:

Detalles técnicos trazas, registros y código del informe original

	if (k >= map->max_entries)
		return -EINVAL;

	spin_lock_bh(&m->lock);
	map_entry = &m->xsk_map[k]; // Out-of-bounds map_entry
	old_xs = unrcu_pointer(xchg(map_entry, NULL));  // Oob write
	if (old_xs)
		xsk_map_sock_delete(old_xs, map_entry);
	spin_unlock_bh(&m->lock);

[76612.897343] BUG: unable to handle page fault for address: ffffc8fc2e461108
[76612.904330] #PF: supervisor write access in kernel mode
[76612.909639] #PF: error_code(0x0002) - not-present page
[76612.914855] PGD 0 P4D 0
[76612.917431] Oops: Oops: 0002 [#1] PREEMPT SMP
[76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out Not tainted 6.12.0-rc1+ #470
[76612.929189] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019
[76612.939781] RIP: 0010:xsk_map_delete_elem+0x2d/0x60
[76612.944738] Code: 00 00 41 54 55 53 48 63 2e 3b 6f 24 73 38 4c 8d a7 f8 00 00 00 48 89 fb 4c 89 e7 e8 2d bf 05 00 48 8d b4 eb 00 01 00 00 31 ff <48> 87 3e 48 85 ff 74 05 e8 16 ff ff ff 4c 89 e7 e8 3e bc 05 00 31
[76612.963774] RSP: 0018:ffffc9002e407df8 EFLAGS: 00010246
[76612.969079] RAX: 0000000000000000 RBX: ffffc9002e461000 RCX: 0000000000000000
[76612.976323] RDX: 0000000000000001 RSI: ffffc8fc2e461108 RDI: 0000000000000000
[76612.983569] RBP: ffffffff80000001 R08: 0000000000000000 R09: 0000000000000007
[76612.990812] R10: ffffc9002e407e18 R11: ffff888108a38858 R12: ffffc9002e4610f8
[76612.998060] R13: ffff888108a38858 R14: 00007ffd1ae0ac78 R15: ffffc9002e4610c0
[76613.005303] FS:  00007f80b6f59740(0000) GS:ffff8897e0ec0000(0000) knlGS:0000000000000000
[76613.013517] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[76613.019349] CR2: ffffc8fc2e461108 CR3: 000000011e3ef001 CR4: 00000000007726f0
[76613.026595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[76613.033841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[76613.041086] PKRU: 55555554
[76613.043842] Call Trace:
[76613.046331]  <TASK>
[76613.048468]  ? __die+0x20/0x60
[76613.051581]  ? page_fault_oops+0x15a/0x450
[76613.055747]  ? search_extable+0x22/0x30
[76613.059649]  ? search_bpf_extables+0x5f/0x80
[76613.063988]  ? exc_page_fault+0xa9/0x140
[76613.067975]  ? asm_exc_page_fault+0x22/0x30
[76613.072229]  ? xsk_map_delete_elem+0x2d/0x60
[76613.076573]  ? xsk_map_delete_elem+0x23/0x60
[76613.080914]  __sys_bpf+0x19b7/0x23c0
[76613.084555]  __x64_sys_bpf+0x1a/0x20
[76613.088194]  do_syscall_64+0x37/0xb0
[76613.091832]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[76613.096962] RIP: 0033:0x7f80b6d1e88d
[76613.100592] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 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 8b 0d 73 b5 0f 00 f7 d8 64 89 01 48
[76613.119631] RSP: 002b:00007ffd1ae0ac68 EFLAGS: 00000206 ORIG_RAX: 0000000000000141
[76613.131330] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80b6d1e88d
[76613.142632] RDX: 0000000000000098 RSI: 00007ffd1ae0ad20 RDI: 0000000000000003
[76613.153967] RBP: 00007ffd1ae0adc0 R08: 0000000000000000 R09: 0000000000000000
[76613.166030] R10: 00007f80b6f77040 R11: 0000000000000206 R12: 00007ffd1ae0aed8
[76613.177130] R13: 000055ddf42ce1e9 R14: 000055ddf42d0d98 R15: 00
---truncated---

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.26%
Percentil entre todas las CVEs puntuadas: 16
Fecha de la puntuación: 6/10/2026

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).

🎯 Técnicas ATT&CK

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

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation95 %
Impacto principalT1565.001 Stored Data Manipulationimpact85 %
Impacto secundarioT1499.004 Application or System Exploitationimpact70 %

Vulnerabilidad de escalada local (AV:L, PR:L) que permite escrituras fuera de límites en memoria del kernel mediante control de usuario del índice de array. Resultados: corrupción de datos y potencial DoS por crash del kernel.

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 Program Restrict File and Directory Permissions Remote Data Storage Filter Network Traffic Execution Prevention Encrypt Sensitive Information

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-787
CWE-787

Referencias

JSON original (NVD)

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  "id": "CVE-2024-56614",
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              "version": "5.15.174",
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              "version": "6.1.120",
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              "lessThanOrEqual": "6.1.*"
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          "value": "CWE-787"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: fix OOB map writes when deleting elements\n\nJordy says:\n\n\"\nIn the xsk_map_delete_elem function an unsigned integer\n(map->max_entries) is compared with a user-controlled signed integer\n(k). Due to implicit type conversion, a large unsigned value for\nmap->max_entries can bypass the intended bounds check:\n\n\tif (k >= map->max_entries)\n\t\treturn -EINVAL;\n\nThis allows k to hold a negative value (between -2147483648 and -2),\nwhich is then used as an array index in m->xsk_map[k], which results\nin an out-of-bounds access.\n\n\tspin_lock_bh(&m->lock);\n\tmap_entry = &m->xsk_map[k]; // Out-of-bounds map_entry\n\told_xs = unrcu_pointer(xchg(map_entry, NULL));  // Oob write\n\tif (old_xs)\n\t\txsk_map_sock_delete(old_xs, map_entry);\n\tspin_unlock_bh(&m->lock);\n\nThe xchg operation can then be used to cause an out-of-bounds write.\nMoreover, the invalid map_entry passed to xsk_map_sock_delete can lead\nto further memory corruption.\n\"\n\nIt indeed results in following splat:\n\n[76612.897343] BUG: unable to handle page fault for address: ffffc8fc2e461108\n[76612.904330] #PF: supervisor write access in kernel mode\n[76612.909639] #PF: error_code(0x0002) - not-present page\n[76612.914855] PGD 0 P4D 0\n[76612.917431] Oops: Oops: 0002 [#1] PREEMPT SMP\n[76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out Not tainted 6.12.0-rc1+ #470\n[76612.929189] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[76612.939781] RIP: 0010:xsk_map_delete_elem+0x2d/0x60\n[76612.944738] Code: 00 00 41 54 55 53 48 63 2e 3b 6f 24 73 38 4c 8d a7 f8 00 00 00 48 89 fb 4c 89 e7 e8 2d bf 05 00 48 8d b4 eb 00 01 00 00 31 ff <48> 87 3e 48 85 ff 74 05 e8 16 ff ff ff 4c 89 e7 e8 3e bc 05 00 31\n[76612.963774] RSP: 0018:ffffc9002e407df8 EFLAGS: 00010246\n[76612.969079] RAX: 0000000000000000 RBX: ffffc9002e461000 RCX: 0000000000000000\n[76612.976323] RDX: 0000000000000001 RSI: ffffc8fc2e461108 RDI: 0000000000000000\n[76612.983569] RBP: ffffffff80000001 R08: 0000000000000000 R09: 0000000000000007\n[76612.990812] R10: ffffc9002e407e18 R11: ffff888108a38858 R12: ffffc9002e4610f8\n[76612.998060] R13: ffff888108a38858 R14: 00007ffd1ae0ac78 R15: ffffc9002e4610c0\n[76613.005303] FS:  00007f80b6f59740(0000) GS:ffff8897e0ec0000(0000) knlGS:0000000000000000\n[76613.013517] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[76613.019349] CR2: ffffc8fc2e461108 CR3: 000000011e3ef001 CR4: 00000000007726f0\n[76613.026595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[76613.033841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[76613.041086] PKRU: 55555554\n[76613.043842] Call Trace:\n[76613.046331]  <TASK>\n[76613.048468]  ? __die+0x20/0x60\n[76613.051581]  ? page_fault_oops+0x15a/0x450\n[76613.055747]  ? search_extable+0x22/0x30\n[76613.059649]  ? search_bpf_extables+0x5f/0x80\n[76613.063988]  ? exc_page_fault+0xa9/0x140\n[76613.067975]  ? asm_exc_page_fault+0x22/0x30\n[76613.072229]  ? xsk_map_delete_elem+0x2d/0x60\n[76613.076573]  ? xsk_map_delete_elem+0x23/0x60\n[76613.080914]  __sys_bpf+0x19b7/0x23c0\n[76613.084555]  __x64_sys_bpf+0x1a/0x20\n[76613.088194]  do_syscall_64+0x37/0xb0\n[76613.091832]  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n[76613.096962] RIP: 0033:0x7f80b6d1e88d\n[76613.100592] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 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 8b 0d 73 b5 0f 00 f7 d8 64 89 01 48\n[76613.119631] RSP: 002b:00007ffd1ae0ac68 EFLAGS: 00000206 ORIG_RAX: 0000000000000141\n[76613.131330] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80b6d1e88d\n[76613.142632] RDX: 0000000000000098 RSI: 00007ffd1ae0ad20 RDI: 0000000000000003\n[76613.153967] RBP: 00007ffd1ae0adc0 R08: 0000000000000000 R09: 0000000000000000\n[76613.166030] R10: 00007f80b6f77040 R11: 0000000000000206 R12: 00007ffd1ae0aed8\n[76613.177130] R13: 000055ddf42ce1e9 R14: 000055ddf42d0d98 R15: 00\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xsk: se corrige la escritura en mapas OOB al eliminar elementos Jordy dice: \"En la función xsk_map_delete_elem, un entero sin signo (map-&gt;max_entries) se compara con un entero con signo controlado por el usuario (k). Debido a la conversión de tipo implícita, un valor sin signo grande para map-&gt;max_entries puede eludir la comprobación de los límites prevista: if (k &gt;= map-&gt;max_entries) return -EINVAL; Esto permite que k contenga un valor negativo (entre -2147483648 y -2), que luego se utiliza como un índice de matriz en m-&gt;xsk_map[k], lo que da como resultado un acceso fuera de los límites. spin_lock_bh(&amp;m-&gt;lock); map_entry = &amp;m-&gt;xsk_map[k]; // Entrada de mapa fuera de los límites old_xs = unrcu_pointer(xchg(map_entry, NULL)); // Oob write if (old_xs) xsk_map_sock_delete(old_xs, map_entry); spin_unlock_bh(&amp;m-&gt;lock); La operación xchg se puede utilizar para provocar una escritura fuera de los límites. Además, la map_entry no válida pasada a xsk_map_sock_delete puede provocar una mayor corrupción de la memoria. \" De hecho, da como resultado el siguiente error: [76612.897343] ERROR: no se puede gestionar la falla de página para la dirección: ffffc8fc2e461108 [76612.904330] #PF: acceso de escritura del supervisor en modo kernel [76612.909639] #PF: error_code(0x0002) - página no presente [76612.914855] PGD 0 P4D 0 [76612.917431] Ups: Ups: 0002 [#1] PREEMPT SMP [76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out No contaminado 6.12.0-rc1+ #470 [76612.929189] Nombre del hardware: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 19/03/2019 [76612.939781] RIP: 0010:xsk_map_delete_elem+0x2d/0x60 [76612.944738] Código: 00 00 41 54 55 53 48 63 2e 3b 6f 24 73 38 4c 8d a7 f8 00 00 00 48 89 fb 4c 89 e7 e8 2d bf 05 00 48 8d b4 eb 00 01 00 00 31 y siguientes &lt;48&gt; 87 3e 48 85 y siguientes 74 05 e8 16 y siguientes y siguientes y siguientes 4c 89 e7 e8 3e bc 05 00 31 [76612.963774] RSP: 0018:ffffc9002e407df8 EFLAGS: 00010246 [76612.969079] RAX: 0000000000000000 RBX: ffffc9002e461000 RCX: 0000000000000000 [76612.976323] RDX: 0000000000000001 RSI: ffffc8fc2e461108 RDI: 00000000000000000 [76612.983569] RBP: ffffffff80000001 R08: 0000000000000000 R09: 0000000000000007 [76612.990812] R10: ffffc9002e407e18 R11: ffff888108a38858 R12: ffffc9002e4610f8 [76612.998060] R13: ffff888108a38858 R14: 00007ffd1ae0ac78 R15: ffffc9002e4610c0 [76613.005303] FS: 00007f80b6f59740(0000) GS:ffff8897e0ec0000(0000) knlGS:0000000000000000 [76613.013517] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [76613.019349] CR2: ffffc8fc2e461108 CR3: 000000011e3ef001 CR4: 00000000007726f0 [76613.026595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000000 [76613.033841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [76613.041086] PKRU: 55555554 [76613.043842] Seguimiento de llamadas: [76613.046331]  [76613.048468] ? __die+0x20/0x60 [76613.051581] ? error_de_página_oops+0x15a/0x450 [76613.055747] ? búsqueda_extable+0x22/0x30 [76613.059649] ? búsqueda_bpf_extables+0x5f/0x80 [76613.063988] ? error_de_página_exc+0xa9/0x140 [76613.067975] ? error_de_página_exc+0x22/0x30 [76613.072229] ? ¿xsk_map_delete_elem+0x2d/0x60 [76613.076573] ? xsk_map_delete_elem+0x23/0x60 [76613.080914] __sys_bpf+0x19b7/0x23c0 [76613.084555] __x64_sys_bpf+0x1a/0x20 [76613.088194] hacer_syscall_64+0x37/0xb0 [76613.091832] entrada_SYSCALL_64_after_hwframe+0x4b/0x53 [76613.096962] RIP: 0033:0x7f80b6d1e88d [76613.100592] Código: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 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 &lt;48&gt; 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 b5 0f 00 f7 d8 64 89 01 48 [76613.119631] RSP: 002b:00007ffd1ae0ac68 EFLAGS: 00000206 ORIG_RAX: 0000000000000141 [76613.131330] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80b6d1e88d [76613.142632] RDX: 000000000000000098 RSI: 00007ffd1ae0ad20 RDI: 0000000000000003 [76613.153967]  ---truncado---"
    }
  ],
  "lastModified": "2026-06-17T08:12:33.170",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}