CVE-2026-98524

Estado: RecibidaSin puntuar—

Gravedad—Sin puntuar

Probabilidad de explotación0.22 %mayor que el 12 % 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:

rds: ib: Limpiar la lista sg cuando falla el mapeo de un MR

rds_ib_map_frmr() almacena la lista de dispersión (scatterlist) del llamador en el MR antes de que puedan fallar el mapeo DMA y el registro. En caso de fallo, __rds_rdma_map() desancla las páginas y libera la scatterlist, pero rds_ib_free_frmr() puede seguir devolviendo el MR al pool con el puntero obsoleto.

Esto deja el pool con una scatterlist colgante y puede conducir a una escalada de privilegios local. KASAN detecta el use-after-free resultante cuando el MR se desmantela posteriormente:

Leer descripción completaMostrar menos

Call Trace: __rds_ib_teardown_mr rds_ib_unreg_frmr rds_ib_flush_mr_pool rds_ib_flush_mrs rds_free_mr rds_setsockopt

Almacenar la scatterlist en el MR solo después de que el mapeo DMA tenga éxito. Si el mapeo DMA falla, retornar directamente mientras los campos del MR permanecen a cero; el llamador conserva la propiedad de la scatterlist y de sus páginas ancladas. Si un paso posterior del registro falla, desmapear la scatterlist y limpiar los campos del MR antes de retornar.

Detalles técnicos trazas, registros y código del informe original

BUG: KASAN: slab-use-after-free in __rds_ib_teardown_mr
Read of size 8

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: 0.22 %
Percentil entre todas las CVEs puntuadas: 12
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

Mostrar las 8 referencias

JSON original (NVD)

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{
  "id": "CVE-2026-98524",
  "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": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "lessThan": "1be3211e6ac77adbb1eac01314d989d243b32c59",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "lessThan": "c42d316163f89cd23de2f3e24558177a8c29bad8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "lessThan": "8dca3c81344532a7f05edb3d12f31f3009410a90",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "lessThan": "49ba5ed0129906e0362c2e4b5e21c89b2a41e115",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "lessThan": "4468df5bcdef959fd96494e9968f323561a45f4c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "lessThan": "e2ee0616260080376123997488b5cf8a3870b8d9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "lessThan": "b36d32f30c3f1e58e3a5ae79d0f52836a316b36e",
              "versionType": "git"
            },
            {
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              "lessThan": "58eb1b3325edac42dc6df72c80962bd53a3c8ca7",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/rds/ib_frmr.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.6",
              "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/rds/ib_frmr.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-18T16:17:03.827",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1be3211e6ac77adbb1eac01314d989d243b32c59",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4468df5bcdef959fd96494e9968f323561a45f4c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/49ba5ed0129906e0362c2e4b5e21c89b2a41e115",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/58eb1b3325edac42dc6df72c80962bd53a3c8ca7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8dca3c81344532a7f05edb3d12f31f3009410a90",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b36d32f30c3f1e58e3a5ae79d0f52836a316b36e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c42d316163f89cd23de2f3e24558177a8c29bad8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e2ee0616260080376123997488b5cf8a3870b8d9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: ib: Clear the sg list when mapping an MR fails\n\nrds_ib_map_frmr() stores the caller's scatterlist in the MR before DMA\nmapping and registration can fail. On failure, __rds_rdma_map() unpins\nthe pages and frees the scatterlist, but rds_ib_free_frmr() can still\nreturn the MR to the pool with the stale pointer set.\n\nThis leaves the pool with a dangling scatterlist and can lead to local\nprivilege escalation. KASAN detects the resulting use-after-free when the\nMR is later torn down:\n\nBUG: KASAN: slab-use-after-free in __rds_ib_teardown_mr\nRead of size 8\n\nCall Trace:\n __rds_ib_teardown_mr\n rds_ib_unreg_frmr\n rds_ib_flush_mr_pool\n rds_ib_flush_mrs\n rds_free_mr\n rds_setsockopt\n\nStore the scatterlist in the MR only after DMA mapping succeeds. If DMA\nmapping fails, return directly while the MR fields remain clear; the caller\nkeeps ownership of the scatterlist and its pinned pages. If a later\nregistration step fails, unmap the scatterlist and clear the MR fields\nbefore returning."
    }
  ],
  "lastModified": "2026-10-19T10:19:07.553",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}