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CVE-2025-40159

Estado: AplazadaAlta (7.8)—

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

xsk: Harden userspace-supplied xdp_desc validation

Turned out certain clearly invalid values passed in xdp_desc from userspace can pass xp_{,un}aligned_validate_desc() and then lead to UBs or just invalid frames to be queued for xmit.

desc->len close to ``U32_MAX`` with a non-zero pool->tx_metadata_len can cause positive integer overflow and wraparound, the same way low enough desc->addr with a non-zero pool->tx_metadata_len can cause negative integer overflow. Both scenarios can then pass the validation successfully. This doesn't happen with valid XSk applications, but can be used to perform attacks.

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Always promote desc->len to ``u64`` first to exclude positive overflows of it. Use explicit check_{add,sub}_overflow() when validating desc->addr (which is ``u64`` already).

bloat-o-meter reports a little growth of the code size:

add/remove: 0/0 grow/shrink: 2/1 up/down: 60/-16 (44) Function old new delta xskq_cons_peek_desc 299 330 +31 xsk_tx_peek_release_desc_batch 973 1002 +29 xsk_generic_xmit 3148 3132 -16

but hopefully this doesn't hurt the performance much.

CVSS

Probabilidad de explotación (EPSS)

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.

Vulnerabilidad local en kernel Linux (AV:L/PR:L) que permite escalada mediante integer overflow en validación de descriptores XDP; permite ejecución de código o DoS sin privilegios previos.

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 PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network Traffic

Tecnologías afectadas (1)

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

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-40159",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "341ac980eab90ac1f6c22ee9f9da83ed9604d899",
              "lessThan": "1463cd066f32efd56ddfd3ac4e3524200f362980",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "341ac980eab90ac1f6c22ee9f9da83ed9604d899",
              "lessThan": "5b5fffa7c81e55d8c8edf05ad40d811ec7047e21",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "341ac980eab90ac1f6c22ee9f9da83ed9604d899",
              "lessThan": "07ca98f906a403637fc5e513a872a50ef1247f3b",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/xdp/xsk_queue.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.8",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.54",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.17.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/xdp/xsk_queue.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-11-12T11:15:46.000",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/07ca98f906a403637fc5e513a872a50ef1247f3b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1463cd066f32efd56ddfd3ac4e3524200f362980",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5b5fffa7c81e55d8c8edf05ad40d811ec7047e21",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: Harden userspace-supplied xdp_desc validation\n\nTurned out certain clearly invalid values passed in xdp_desc from\nuserspace can pass xp_{,un}aligned_validate_desc() and then lead\nto UBs or just invalid frames to be queued for xmit.\n\ndesc->len close to ``U32_MAX`` with a non-zero pool->tx_metadata_len\ncan cause positive integer overflow and wraparound, the same way low\nenough desc->addr with a non-zero pool->tx_metadata_len can cause\nnegative integer overflow. Both scenarios can then pass the\nvalidation successfully.\nThis doesn't happen with valid XSk applications, but can be used\nto perform attacks.\n\nAlways promote desc->len to ``u64`` first to exclude positive\noverflows of it. Use explicit check_{add,sub}_overflow() when\nvalidating desc->addr (which is ``u64`` already).\n\nbloat-o-meter reports a little growth of the code size:\n\nadd/remove: 0/0 grow/shrink: 2/1 up/down: 60/-16 (44)\nFunction                                     old     new   delta\nxskq_cons_peek_desc                          299     330     +31\nxsk_tx_peek_release_desc_batch               973    1002     +29\nxsk_generic_xmit                            3148    3132     -16\n\nbut hopefully this doesn't hurt the performance much."
    }
  ],
  "lastModified": "2026-07-30T06:24:14.513",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}