CVE-2026-98567

Estado: RecibidaSin puntuar—

Gravedad—Sin puntuar

Probabilidad de explotación0.21 %mayor que el 11 % de las CVE

Explotación activaNono figura en el catálogo de CISA

Exploit públicoNo conocidosin código público localizado

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:

net: xps: rechazar una clase de tráfico fuera de rango

Solo las entradas por debajo de dev->num_tc son válidas en dev->tc_to_txq[], y dev->prio_tc_map[] solo puede nombrar clases por debajo de ese valor. netdev_set_num_tc() reduce dev->num_tc sin tocar ninguno de los dos arrays.

netdev_txq_to_tc() recorre todas las posiciones de TC_MAX_QUEUE y netdev_get_prio_tc_map() devuelve la entrada tal como está, de modo que una entrada sobrante se entrega como clase de tráfico >= dev->num_tc. Al tomar esa clase desde netdev_txq_to_tc(), __netif_set_xps_queue() rechaza solo una clase negativa e indexa un mapa XPS dimensionado para dev->num_tc clases:

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attr_map[] contiene nr_ids * num_tc entradas y j recorre los ids indicados en la máscara, así que una clase que no está por debajo de num_tc empuja tci más allá del final del mapa para los últimos ids, y la escritura se sale de los límites.

Cualquier llamada que reduzca num_tc deja tales entradas atrás, y mqprio_destroy() desmonta con netdev_set_num_tc(dev, 0) en lugar de netdev_reset_tc(). Tras mqprio con 8 clases y después 1, tc_to_txq[1..7] siguen describiendo las txq 1..7. El error se produce con una escritura XPS en la txq 2 sobre un veth con 8 colas rx: attr_map[] tiene 8 * 1 entradas, tci = j + 2, y con j == 6 se escribe una posición más allá del final del mapa de 88 bytes:

Rechazar una clase para la que el mapa no tiene espacio.

Detalles técnicos trazas, registros y código del informe original

	tci = j * num_tc + tc;
	RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);

  BUG: KASAN: slab-out-of-bounds in __netif_set_xps_queue (net/core/dev.c:2954)
  Write of size 8 at addr ffff88813016bc58 by task xps_oob/634
   __netif_set_xps_queue (net/core/dev.c:2954)
   xps_rxqs_store (net/core/net-sysfs.c:1880)
   netdev_queue_attr_store (net/core/net-sysfs.c:1390)
  Allocated by task 634:
   __kmalloc_noprof (mm/slub.c:5439)
   __netif_set_xps_queue (net/core/dev.c:2937)
  The buggy address is located 0 bytes to the right of
   allocated 88-byte region [ffff88813016bc00, ffff88813016bc58)

Traducción automática del texto original de NVD (en inglés).

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.21 %
Percentil entre todas las CVEs puntuadas: 11
Fecha de la puntuación: 20/10/2026

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 (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

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JSON original (NVD)

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{
  "id": "CVE-2026-98567",
  "cveTags": [],
  "metrics": {},
  "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",
              "version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
              "lessThan": "967e10f40a0c6732db299cbe001df0e859196055",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
              "lessThan": "1cb8e40525a72c9f1e1cf94c68c172b3b9bbdc81",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
              "lessThan": "6ea8f643053f33622f9116e4e1db58306ece45e3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
              "lessThan": "9e841723ba482d41ecbf90241c756a16cdfea949",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
              "lessThan": "eff227a3cb4d0089fbb85c73480bf8abf2e5ae7f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
              "lessThan": "2cc1c3977acbffc417fb5b57699d1df3dcffb5fd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
              "lessThan": "930318290d8509e864c015fe6c9239470b3c579c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "184c449f91fef521042970cca46bd5cdfc0e3a37",
              "lessThan": "4da3b7b8b50f3e2fde54a4c18a82a8e3f6223910",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/core/dev.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.10",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/core/dev.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-18T16:17:08.870",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1cb8e40525a72c9f1e1cf94c68c172b3b9bbdc81",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2cc1c3977acbffc417fb5b57699d1df3dcffb5fd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4da3b7b8b50f3e2fde54a4c18a82a8e3f6223910",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6ea8f643053f33622f9116e4e1db58306ece45e3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/930318290d8509e864c015fe6c9239470b3c579c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/967e10f40a0c6732db299cbe001df0e859196055",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9e841723ba482d41ecbf90241c756a16cdfea949",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/eff227a3cb4d0089fbb85c73480bf8abf2e5ae7f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: xps: reject an out of range traffic class\n\nOnly the entries below dev->num_tc are valid in dev->tc_to_txq[], and\ndev->prio_tc_map[] may only name classes below it. netdev_set_num_tc()\nlowers dev->num_tc without touching either array.\n\nnetdev_txq_to_tc() walks all TC_MAX_QUEUE slots and\nnetdev_get_prio_tc_map() returns the entry as it stands, so a leftover\nentry is handed out as a traffic class >= dev->num_tc. Taking that\nclass from netdev_txq_to_tc(), __netif_set_xps_queue() rejects only a\nnegative one and indexes an XPS map sized for dev->num_tc classes:\n\n\ttci = j * num_tc + tc;\n\tRCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);\n\nattr_map[] holds nr_ids * num_tc entries and j runs over the ids named\nin the mask, so a class that is not below num_tc pushes tci past the end\nof the map for the last ids and the store overruns it.\n\nAny caller that lowers num_tc leaves such entries behind, and\nmqprio_destroy() tears down with netdev_set_num_tc(dev, 0) rather than\nnetdev_reset_tc(). After mqprio with 8 classes then 1, tc_to_txq[1..7]\nstill describe txq 1..7. The splat is from an XPS write to txq 2 on a\nveth with 8 rx queues: attr_map[] has 8 * 1 entries, tci = j + 2, and\nj == 6 stores one past the end of the 88-byte map:\n\n  BUG: KASAN: slab-out-of-bounds in __netif_set_xps_queue (net/core/dev.c:2954)\n  Write of size 8 at addr ffff88813016bc58 by task xps_oob/634\n   __netif_set_xps_queue (net/core/dev.c:2954)\n   xps_rxqs_store (net/core/net-sysfs.c:1880)\n   netdev_queue_attr_store (net/core/net-sysfs.c:1390)\n  Allocated by task 634:\n   __kmalloc_noprof (mm/slub.c:5439)\n   __netif_set_xps_queue (net/core/dev.c:2937)\n  The buggy address is located 0 bytes to the right of\n   allocated 88-byte region [ffff88813016bc00, ffff88813016bc58)\n\nReject a class the map has no room for."
    }
  ],
  "lastModified": "2026-10-19T10:19:14.597",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}