CVE-2025-21692

Estado: ModificadaAlta (7.8)—

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

net: sched: fix ets qdisc OOB Indexing

Haowei Yan <g1042620637@gmail.com> found that ets_class_from_arg() can index an Out-Of-Bound class in ets_class_from_arg() when passed clid of 0. The overflow may cause local privilege escalation.

Detalles técnicos trazas, registros y código del informe original

 [   18.852298] ------------[ cut here ]------------
 [   18.853271] UBSAN: array-index-out-of-bounds in net/sched/sch_ets.c:93:20
 [   18.853743] index 18446744073709551615 is out of range for type 'ets_class [16]'
 [   18.854254] CPU: 0 UID: 0 PID: 1275 Comm: poc Not tainted 6.12.6-dirty #17
 [   18.854821] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
 [   18.856532] Call Trace:
 [   18.857441]  <TASK>
 [   18.858227]  dump_stack_lvl+0xc2/0xf0
 [   18.859607]  dump_stack+0x10/0x20
 [   18.860908]  __ubsan_handle_out_of_bounds+0xa7/0xf0
 [   18.864022]  ets_class_change+0x3d6/0x3f0
 [   18.864322]  tc_ctl_tclass+0x251/0x910
 [   18.864587]  ? lock_acquire+0x5e/0x140
 [   18.865113]  ? __mutex_lock+0x9c/0xe70
 [   18.866009]  ? __mutex_lock+0xa34/0xe70
 [   18.866401]  rtnetlink_rcv_msg+0x170/0x6f0
 [   18.866806]  ? __lock_acquire+0x578/0xc10
 [   18.867184]  ? __pfx_rtnetlink_rcv_msg+0x10/0x10
 [   18.867503]  netlink_rcv_skb+0x59/0x110
 [   18.867776]  rtnetlink_rcv+0x15/0x30
 [   18.868159]  netlink_unicast+0x1c3/0x2b0
 [   18.868440]  netlink_sendmsg+0x239/0x4b0
 [   18.868721]  ____sys_sendmsg+0x3e2/0x410
 [   18.869012]  ___sys_sendmsg+0x88/0xe0
 [   18.869276]  ? rseq_ip_fixup+0x198/0x260
 [   18.869563]  ? rseq_update_cpu_node_id+0x10a/0x190
 [   18.869900]  ? trace_hardirqs_off+0x5a/0xd0
 [   18.870196]  ? syscall_exit_to_user_mode+0xcc/0x220
 [   18.870547]  ? do_syscall_64+0x93/0x150
 [   18.870821]  ? __memcg_slab_free_hook+0x69/0x290
 [   18.871157]  __sys_sendmsg+0x69/0xd0
 [   18.871416]  __x64_sys_sendmsg+0x1d/0x30
 [   18.871699]  x64_sys_call+0x9e2/0x2670
 [   18.871979]  do_syscall_64+0x87/0x150
 [   18.873280]  ? do_syscall_64+0x93/0x150
 [   18.874742]  ? lock_release+0x7b/0x160
 [   18.876157]  ? do_user_addr_fault+0x5ce/0x8f0
 [   18.877833]  ? irqentry_exit_to_user_mode+0xc2/0x210
 [   18.879608]  ? irqentry_exit+0x77/0xb0
 [   18.879808]  ? clear_bhb_loop+0x15/0x70
 [   18.880023]  ? clear_bhb_loop+0x15/0x70
 [   18.880223]  ? clear_bhb_loop+0x15/0x70
 [   18.880426]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
 [   18.880683] RIP: 0033:0x44a957
 [   18.880851] Code: ff ff e8 fc 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 8974 24 10
 [   18.881766] RSP: 002b:00007ffcdd00fad8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
 [   18.882149] RAX: ffffffffffffffda RBX: 00007ffcdd010db8 RCX: 000000000044a957
 [   18.882507] RDX: 0000000000000000 RSI: 00007ffcdd00fb70 RDI: 0000000000000003
 [   18.885037] RBP: 00007ffcdd010bc0 R08: 000000000703c770 R09: 000000000703c7c0
 [   18.887203] R10: 0000000000000080 R11: 0000000000000246 R12: 0000000000000001
 [   18.888026] R13: 00007ffcdd010da8 R14: 00000000004ca7d0 R15: 0000000000000001
 [   18.888395]  </TASK>
 [   18.888610] ---[ end trace ]---

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: 0.62%
Percentil entre todas las CVEs puntuadas: 48
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 principalT1059 Command and Scripting Interpreterexecution75 %
Impacto secundarioT1548 Abuse Elevation Control Mechanismprivilege escalation70 %

Acceso local sin interacción (AV:L, PR:L, UI:N) en kernel Linux permite escalada de privilegios vía desbordamiento de índices en qdisc ets, ejecutando código con permisos elevados.

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

Execution Prevention Privileged Account Management Audit Update Software User Account Management Threat Intelligence Program

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-129
CWE-129

Referencias

JSON original (NVD)

Mostrar

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  "id": "CVE-2025-21692",
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "options": [
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          "version": "2.0.3",
          "timestamp": "2025-10-01T19:51:24.646401Z"
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    {
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      "affectedData": [
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              "versionType": "git"
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              "lessThan": "d62b04fca4340a0d468d7853bd66e511935a18cb",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/sched/sch_ets.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.6",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.234",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.178",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.128",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.75",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.12",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13.1",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/sched/sch_ets.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "affectedData": [
        {
          "vendor": "Siemens",
          "product": "RUGGEDCOM RST2428P",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "V3.2",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "V3.2",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
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        {
          "vendor": "Siemens",
          "product": "SCALANCE XCM-/XRM-/XCH-/XRH-300 family",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "V3.2",
              "versionType": "custom"
            }
          ],
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        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        }
      ]
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  ],
  "published": "2025-02-10T16:15:38.763",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/03c56665dab1f4ac844bc156652d50d639093fa5",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1332c6ed446be787f901ed1064ec6a3c694f028a",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/997f6ec4208b23c87daf9f044689685f091826f7",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bcf0d815e728a3a304b50455b32a3170c16e1eaa",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d62b04fca4340a0d468d7853bd66e511935a18cb",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f4168299e553f17aa2ba4016e77a9c38da40eb1d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f6b0f05fbfa4044f890e8a348288c0d9a20bd1d0",
      "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"
    },
    {
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    },
    {
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-355557.html",
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-129"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-129"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: fix ets qdisc OOB Indexing\n\nHaowei Yan <g1042620637@gmail.com> found that ets_class_from_arg() can\nindex an Out-Of-Bound class in ets_class_from_arg() when passed clid of\n0. The overflow may cause local privilege escalation.\n\n [   18.852298] ------------[ cut here ]------------\n [   18.853271] UBSAN: array-index-out-of-bounds in net/sched/sch_ets.c:93:20\n [   18.853743] index 18446744073709551615 is out of range for type 'ets_class [16]'\n [   18.854254] CPU: 0 UID: 0 PID: 1275 Comm: poc Not tainted 6.12.6-dirty #17\n [   18.854821] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n [   18.856532] Call Trace:\n [   18.857441]  <TASK>\n [   18.858227]  dump_stack_lvl+0xc2/0xf0\n [   18.859607]  dump_stack+0x10/0x20\n [   18.860908]  __ubsan_handle_out_of_bounds+0xa7/0xf0\n [   18.864022]  ets_class_change+0x3d6/0x3f0\n [   18.864322]  tc_ctl_tclass+0x251/0x910\n [   18.864587]  ? lock_acquire+0x5e/0x140\n [   18.865113]  ? __mutex_lock+0x9c/0xe70\n [   18.866009]  ? __mutex_lock+0xa34/0xe70\n [   18.866401]  rtnetlink_rcv_msg+0x170/0x6f0\n [   18.866806]  ? __lock_acquire+0x578/0xc10\n [   18.867184]  ? __pfx_rtnetlink_rcv_msg+0x10/0x10\n [   18.867503]  netlink_rcv_skb+0x59/0x110\n [   18.867776]  rtnetlink_rcv+0x15/0x30\n [   18.868159]  netlink_unicast+0x1c3/0x2b0\n [   18.868440]  netlink_sendmsg+0x239/0x4b0\n [   18.868721]  ____sys_sendmsg+0x3e2/0x410\n [   18.869012]  ___sys_sendmsg+0x88/0xe0\n [   18.869276]  ? rseq_ip_fixup+0x198/0x260\n [   18.869563]  ? rseq_update_cpu_node_id+0x10a/0x190\n [   18.869900]  ? trace_hardirqs_off+0x5a/0xd0\n [   18.870196]  ? syscall_exit_to_user_mode+0xcc/0x220\n [   18.870547]  ? do_syscall_64+0x93/0x150\n [   18.870821]  ? __memcg_slab_free_hook+0x69/0x290\n [   18.871157]  __sys_sendmsg+0x69/0xd0\n [   18.871416]  __x64_sys_sendmsg+0x1d/0x30\n [   18.871699]  x64_sys_call+0x9e2/0x2670\n [   18.871979]  do_syscall_64+0x87/0x150\n [   18.873280]  ? do_syscall_64+0x93/0x150\n [   18.874742]  ? lock_release+0x7b/0x160\n [   18.876157]  ? do_user_addr_fault+0x5ce/0x8f0\n [   18.877833]  ? irqentry_exit_to_user_mode+0xc2/0x210\n [   18.879608]  ? irqentry_exit+0x77/0xb0\n [   18.879808]  ? clear_bhb_loop+0x15/0x70\n [   18.880023]  ? clear_bhb_loop+0x15/0x70\n [   18.880223]  ? clear_bhb_loop+0x15/0x70\n [   18.880426]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n [   18.880683] RIP: 0033:0x44a957\n [   18.880851] Code: ff ff e8 fc 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 8974 24 10\n [   18.881766] RSP: 002b:00007ffcdd00fad8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\n [   18.882149] RAX: ffffffffffffffda RBX: 00007ffcdd010db8 RCX: 000000000044a957\n [   18.882507] RDX: 0000000000000000 RSI: 00007ffcdd00fb70 RDI: 0000000000000003\n [   18.885037] RBP: 00007ffcdd010bc0 R08: 000000000703c770 R09: 000000000703c7c0\n [   18.887203] R10: 0000000000000080 R11: 0000000000000246 R12: 0000000000000001\n [   18.888026] R13: 00007ffcdd010da8 R14: 00000000004ca7d0 R15: 0000000000000001\n [   18.888395]  </TASK>\n [   18.888610] ---[ end trace ]---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: sched: fix ets qdisc OOB Indexing Haowei Yan  descubrió que ets_class_from_arg() puede indexar una clase fuera de los límites en ets_class_from_arg() cuando se le pasa un clid de 0. El desbordamiento puede provocar una escalada de privilegios locales. [ 18.852298] ------------[ cut here ]------------ [ 18.853271] UBSAN: array-index-out-of-bounds in net/sched/sch_ets.c:93:20 [ 18.853743] index 18446744073709551615 is out of range for type 'ets_class [16]' [ 18.854254] CPU: 0 UID: 0 PID: 1275 Comm: poc Not tainted 6.12.6-dirty #17 [ 18.854821] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 [ 18.856532] Call Trace: [ 18.857441]  [ 18.858227] dump_stack_lvl+0xc2/0xf0 [ 18.859607] dump_stack+0x10/0x20 [ 18.860908] __ubsan_handle_out_of_bounds+0xa7/0xf0 [ 18.864022] ets_class_change+0x3d6/0x3f0 [ 18.864322] tc_ctl_tclass+0x251/0x910 [ 18.864587] ? lock_acquire+0x5e/0x140 [ 18.865113] ? __mutex_lock+0x9c/0xe70 [ 18.866009] ? __mutex_lock+0xa34/0xe70 [ 18.866401] rtnetlink_rcv_msg+0x170/0x6f0 [ 18.866806] ? __lock_acquire+0x578/0xc10 [ 18.867184] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 18.867503] netlink_rcv_skb+0x59/0x110 [ 18.867776] rtnetlink_rcv+0x15/0x30 [ 18.868159] netlink_unicast+0x1c3/0x2b0 [ 18.868440] netlink_sendmsg+0x239/0x4b0 [ 18.868721] ____sys_sendmsg+0x3e2/0x410 [ 18.869012] ___sys_sendmsg+0x88/0xe0 [ 18.869276] ? rseq_ip_fixup+0x198/0x260 [ 18.869563] ? rseq_update_cpu_node_id+0x10a/0x190 [ 18.869900] ? trace_hardirqs_off+0x5a/0xd0 [ 18.870196] ? syscall_exit_to_user_mode+0xcc/0x220 [ 18.870547] ? do_syscall_64+0x93/0x150 [ 18.870821] ? __memcg_slab_free_hook+0x69/0x290 [ 18.871157] __sys_sendmsg+0x69/0xd0 [ 18.871416] __x64_sys_sendmsg+0x1d/0x30 [ 18.871699] x64_sys_call+0x9e2/0x2670 [ 18.871979] do_syscall_64+0x87/0x150 [ 18.873280] ? do_syscall_64+0x93/0x150 [ 18.874742] ? lock_release+0x7b/0x160 [ 18.876157] ? do_user_addr_fault+0x5ce/0x8f0 [ 18.877833] ? irqentry_exit_to_user_mode+0xc2/0x210 [ 18.879608] ? irqentry_exit+0x77/0xb0 [ 18.879808] ? clear_bhb_loop+0x15/0x70 [ 18.880023] ? clear_bhb_loop+0x15/0x70 [ 18.880223] ? clear_bhb_loop+0x15/0x70 [ 18.880426] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 18.880683] RIP: 0033:0x44a957 [ 18.880851] Code: ff ff e8 fc 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 &lt;48&gt; 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 8974 24 10 [ 18.881766] RSP: 002b:00007ffcdd00fad8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 18.882149] RAX: ffffffffffffffda RBX: 00007ffcdd010db8 RCX: 000000000044a957 [ 18.882507] RDX: 0000000000000000 RSI: 00007ffcdd00fb70 RDI: 0000000000000003 [ 18.885037] RBP: 00007ffcdd010bc0 R08: 000000000703c770 R09: 000000000703c7c0 [ 18.887203] R10: 0000000000000080 R11: 0000000000000246 R12: 0000000000000001 [ 18.888026] R13: 00007ffcdd010da8 R14: 00000000004ca7d0 R15: 0000000000000001 [ 18.888395]  [ 18.888610] ---[ end trace ]---"
    }
  ],
  "lastModified": "2026-06-17T08:44:02.260",
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