CVE-2023-54238

Estado: AplazadaAlta (7.8)—

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

mlx5: fix skb leak while fifo resync and push

During ptp resync operation SKBs were poped from the fifo but were never freed neither by napi_consume nor by dev_kfree_skb_any. Add call to napi_consume_skb to properly free SKBs.

Another leak was happening because mlx5e_skb_fifo_has_room() had an error in the check. Comparing free running counters works well unless C promotes the types to something wider than the counter. In this case counters are u16 but the result of the substraction is promouted to int and it causes wrong result (negative value) of the check when producer have already overlapped but consumer haven't yet. Explicit cast to u16 fixes the issue.

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: 0.15%
Percentil entre todas las CVEs puntuadas: 4
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 escalation75 %
Impacto principalT1499.004 Application or System Exploitationimpact60 %

AV:L/PR:L sin UI permite escalada local; el memory leak en SKBs causa DoS por agotamiento de recursos (denial of service por negación de servicio).

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

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

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

JSON original (NVD)

Mostrar

{
  "id": "CVE-2023-54238",
  "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": "58a518948f60153e8f6cb8361d2712aa3a1af94a",
              "lessThan": "234cffda95e1049f58e8ec136ef105c633f0ed19",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "58a518948f60153e8f6cb8361d2712aa3a1af94a",
              "lessThan": "68504c66d08c70fb92799722e25a932d311d74fd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "58a518948f60153e8f6cb8361d2712aa3a1af94a",
              "lessThan": "e435941b1da1a0be4ff8a7ae425774c76a5ac514",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.18",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.2.5",
              "versionType": "semver",
              "lessThanOrEqual": "6.2.*"
            },
            {
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-30T13:16:12.310",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/234cffda95e1049f58e8ec136ef105c633f0ed19",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/68504c66d08c70fb92799722e25a932d311d74fd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e435941b1da1a0be4ff8a7ae425774c76a5ac514",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlx5: fix skb leak while fifo resync and push\n\nDuring ptp resync operation SKBs were poped from the fifo but were never\nfreed neither by napi_consume nor by dev_kfree_skb_any. Add call to\nnapi_consume_skb to properly free SKBs.\n\nAnother leak was happening because mlx5e_skb_fifo_has_room() had an error\nin the check. Comparing free running counters works well unless C promotes\nthe types to something wider than the counter. In this case counters are\nu16 but the result of the substraction is promouted to int and it causes\nwrong result (negative value) of the check when producer have already\noverlapped but consumer haven't yet. Explicit cast to u16 fixes the issue."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmlx5: corrige la fuga de skb durante la resincronización y el envío de fifo\n\nDurante la operación de resincronización de ptp, los SKB fueron extraídos de la fifo pero nunca fueron liberados ni por napi_consume ni por dev_kfree_skb_any. Añade una llamada a napi_consume_skb para liberar correctamente los SKB.\n\nOtra fuga estaba ocurriendo porque mlx5e_skb_fifo_has_room() tenía un error en la comprobación. Comparar contadores de ejecución libre funciona bien a menos que C promueva los tipos a algo más amplio que el contador. En este caso, los contadores son u16 pero el resultado de la resta es promovido a int y causa un resultado incorrecto (valor negativo) de la comprobación cuando el productor ya se ha superpuesto pero el consumidor aún no lo ha hecho. Una conversión explícita a u16 soluciona el problema."
    }
  ],
  "lastModified": "2026-08-04T11:16:38.010",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}