CVE-2026-23378

Estado: ModificadaAlta (7.8)—

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

net/sched: act_ife: Fix metalist update behavior

Whenever an ife action replace changes the metalist, instead of replacing the old data on the metalist, the current ife code is appending the new metadata. Aside from being innapropriate behavior, this may lead to an unbounded addition of metadata to the metalist which might cause an out of bounds error when running the encode op:

To solve this issue, fix the replace behavior by adding the metalist to the ife rcu data structure.

Detalles técnicos trazas, registros y código del informe original

[  138.423369][    C1] ==================================================================
[  138.424317][    C1] BUG: KASAN: slab-out-of-bounds in ife_tlv_meta_encode (net/ife/ife.c:168)
[  138.424906][    C1] Write of size 4 at addr ffff8880077f4ffe by task ife_out_out_bou/255
[  138.425778][    C1] CPU: 1 UID: 0 PID: 255 Comm: ife_out_out_bou Not tainted 7.0.0-rc1-00169-gfbdfa8da05b6 #624 PREEMPT(full)
[  138.425795][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  138.425800][    C1] Call Trace:
[  138.425804][    C1]  <IRQ>
[  138.425808][    C1]  dump_stack_lvl (lib/dump_stack.c:122)
[  138.425828][    C1]  print_report (mm/kasan/report.c:379 mm/kasan/report.c:482)
[  138.425839][    C1]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[  138.425844][    C1]  ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:95 (discriminator 1) ./include/linux/rcupdate.h:975 (discriminator 1) ./include/linux/mmzone.h:2207 (discriminator 1) arch/x86/mm/physaddr.c:54 (discriminator 1))
[  138.425853][    C1]  ? ife_tlv_meta_encode (net/ife/ife.c:168)
[  138.425859][    C1]  kasan_report (mm/kasan/report.c:221 mm/kasan/report.c:597)
[  138.425868][    C1]  ? ife_tlv_meta_encode (net/ife/ife.c:168)
[  138.425878][    C1]  kasan_check_range (mm/kasan/generic.c:186 (discriminator 1) mm/kasan/generic.c:200 (discriminator 1))
[  138.425884][    C1]  __asan_memset (mm/kasan/shadow.c:84 (discriminator 2))
[  138.425889][    C1]  ife_tlv_meta_encode (net/ife/ife.c:168)
[  138.425893][    C1]  ? ife_tlv_meta_encode (net/ife/ife.c:171)
[  138.425898][    C1]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[  138.425903][    C1]  ife_encode_meta_u16 (net/sched/act_ife.c:57)
[  138.425910][    C1]  ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)
[  138.425916][    C1]  ? __asan_memcpy (mm/kasan/shadow.c:105 (discriminator 3))
[  138.425921][    C1]  ? __pfx_ife_encode_meta_u16 (net/sched/act_ife.c:45)
[  138.425927][    C1]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[  138.425931][    C1]  tcf_ife_act (net/sched/act_ife.c:847 net/sched/act_ife.c:879)

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: 0.13%
Percentil entre todas las CVEs puntuadas: 2
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 escalation85 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %
Impacto secundarioT1059 Command and Scripting Interpreterexecution45 %

Vulnerabilidad local (AV:L/PR:L) en kernel Linux que permite escribir fuera de límites (CWE-787) en net/sched/act_ife. Acceso local sin interacción del usuario facilita escalada de privilegios. El desbordamiento de slab puede causar DoS o ejecución de código.

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 Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Filter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-787

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-23378",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
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        "impactScore": 5.9,
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          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 1.8
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  "affected": [
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      "affectedData": [
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          "vendor": "Linux",
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          ],
          "programFiles": [
            "include/net/tc_act/tc_ife.h",
            "net/sched/act_ife.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "versions": [
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              "status": "affected",
              "version": "4.15"
            },
            {
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              "version": "0",
              "lessThan": "4.15",
              "versionType": "semver"
            },
            {
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            {
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              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19.7",
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            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "include/net/tc_act/tc_ife.h",
            "net/sched/act_ife.c"
          ],
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    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "affectedData": [
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.6",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.5",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.6",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.5",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.6",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.5",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.6",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.5",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.6",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.5",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        }
      ]
    }
  ],
  "published": "2026-03-25T11:16:37.643",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/56ade7ddea6ce605552341785d08e365c3f61861",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5b1449301ca070814d866990b46f48d3f39ea4ee",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/691866c4cca54dc4df762276b49e89b36e046947",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/91a89d3bdc2f63d983adc13d1771631663c5dc1b",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cd888c3966672239f2e0707b846a5a936ac9038a",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e2cedd400c3ec0302ffca2490e8751772906ac23",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    },
    {
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ife: Fix metalist update behavior\n\nWhenever an ife action replace changes the metalist, instead of\nreplacing the old data on the metalist, the current ife code is appending\nthe new metadata. Aside from being innapropriate behavior, this may lead\nto an unbounded addition of metadata to the metalist which might cause an\nout of bounds error when running the encode op:\n\n[  138.423369][    C1] ==================================================================\n[  138.424317][    C1] BUG: KASAN: slab-out-of-bounds in ife_tlv_meta_encode (net/ife/ife.c:168)\n[  138.424906][    C1] Write of size 4 at addr ffff8880077f4ffe by task ife_out_out_bou/255\n[  138.425778][    C1] CPU: 1 UID: 0 PID: 255 Comm: ife_out_out_bou Not tainted 7.0.0-rc1-00169-gfbdfa8da05b6 #624 PREEMPT(full)\n[  138.425795][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011\n[  138.425800][    C1] Call Trace:\n[  138.425804][    C1]  <IRQ>\n[  138.425808][    C1]  dump_stack_lvl (lib/dump_stack.c:122)\n[  138.425828][    C1]  print_report (mm/kasan/report.c:379 mm/kasan/report.c:482)\n[  138.425839][    C1]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[  138.425844][    C1]  ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:95 (discriminator 1) ./include/linux/rcupdate.h:975 (discriminator 1) ./include/linux/mmzone.h:2207 (discriminator 1) arch/x86/mm/physaddr.c:54 (discriminator 1))\n[  138.425853][    C1]  ? ife_tlv_meta_encode (net/ife/ife.c:168)\n[  138.425859][    C1]  kasan_report (mm/kasan/report.c:221 mm/kasan/report.c:597)\n[  138.425868][    C1]  ? ife_tlv_meta_encode (net/ife/ife.c:168)\n[  138.425878][    C1]  kasan_check_range (mm/kasan/generic.c:186 (discriminator 1) mm/kasan/generic.c:200 (discriminator 1))\n[  138.425884][    C1]  __asan_memset (mm/kasan/shadow.c:84 (discriminator 2))\n[  138.425889][    C1]  ife_tlv_meta_encode (net/ife/ife.c:168)\n[  138.425893][    C1]  ? ife_tlv_meta_encode (net/ife/ife.c:171)\n[  138.425898][    C1]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[  138.425903][    C1]  ife_encode_meta_u16 (net/sched/act_ife.c:57)\n[  138.425910][    C1]  ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)\n[  138.425916][    C1]  ? __asan_memcpy (mm/kasan/shadow.c:105 (discriminator 3))\n[  138.425921][    C1]  ? __pfx_ife_encode_meta_u16 (net/sched/act_ife.c:45)\n[  138.425927][    C1]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[  138.425931][    C1]  tcf_ife_act (net/sched/act_ife.c:847 net/sched/act_ife.c:879)\n\nTo solve this issue, fix the replace behavior by adding the metalist to\nthe ife rcu data structure."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/sched: act_ife: Corregir el comportamiento de actualización de la metalista\n\nSiempre que una acción ife replace cambia la metalista, en lugar de reemplazar los datos antiguos en la metalista, el código ife actual está añadiendo los nuevos metadatos. Además de ser un comportamiento inapropiado, esto puede llevar a una adición ilimitada de metadatos a la metalista, lo que podría causar un error de fuera de límites al ejecutar la operación de codificación:\n\n[  138.423369][    C1] ==================================================================\n[  138.424317][    C1] BUG: KASAN: slab-out-of-bounds in ife_tlv_meta_encode (net/ife/ife.c:168)\n[  138.424906][    C1] Write of size 4 at addr ffff8880077f4ffe by task ife_out_out_bou/255\n[  138.425778][    C1] CPU: 1 UID: 0 PID: 255 Comm: ife_out_out_bou Not tainted 7.0.0-rc1-00169-gfbdfa8da05b6 #624 PREEMPT(full)\n[  138.425795][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011\n[  138.425800][    C1] Call Trace:\n[  138.425804][    C1]  \n[  138.425808][    C1]  dump_stack_lvl (lib/dump_stack.c:122)\n[  138.425828][    C1]  print_report (mm/kasan/report.c:379 mm/kasan/report.c:482)\n[  138.425839][    C1]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[  138.425844][    C1]  ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:95 (discriminator 1) ./include/linux/rcupdate.h:975 (discriminator 1) ./include/linux/mmzone.h:2207 (discriminator 1) arch/x86/mm/physaddr.c:54 (discriminator 1))\n[  138.425853][    C1]  ? ife_tlv_meta_encode (net/ife/ife.c:168)\n[  138.425859][    C1]  kasan_report (mm/kasan/report.c:221 mm/kasan/report.c:597)\n[  138.425868][    C1]  ? ife_tlv_meta_encode (net/ife/ife.c:168)\n[  138.425878][    C1]  kasan_check_range (mm/kasan/generic.c:186 (discriminator 1) mm/kasan/generic.c:200 (discriminator 1))\n[  138.425884][    C1]  __asan_memset (mm/kasan/shadow.c:84 (discriminator 2))\n[  138.425889][    C1]  ife_tlv_meta_encode (net/ife/ife.c:168)\n[  138.425893][    C1]  ? ife_tlv_meta_encode (net/ife/ife.c:171)\n[  138.425898][    C1]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[  138.425903][    C1]  ife_encode_meta_u16 (net/sched/act_ife.c:57)\n[  138.425910][    C1]  ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)\n[  138.425916][    C1]  ? __asan_memcpy (mm/kasan/shadow.c:105 (discriminator 3))\n[  138.425921][    C1]  ? __pfx_ife_encode_meta_u16 (net/sched/act_ife.c:45)\n[  138.425927][    C1]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[  138.425931][    C1]  tcf_ife_act (net/sched/act_ife.c:847 net/sched/act_ife.c:879)\n\nPara resolver este problema, corregir el comportamiento de reemplazo añadiendo la metalista a la estructura de datos ife rcu."
    }
  ],
  "lastModified": "2026-07-14T13:18:31.513",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CA40C5EF-097F-4B13-B4C5-804D33715854",
              "versionEndExcluding": "6.1.167",
              "versionStartIncluding": "4.15.1"
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