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CVE-2026-63837

Estado: Pendiente de análisisSin puntuar—

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

net: ena: PHC: Check return code before setting timestamp output

ena_phc_gettimex64() is setting the output parameter regardless of whether ena_com_phc_get_timestamp() succeeded or failed.

When ena_com_phc_get_timestamp() returns an error, the timestamp parameter may contain uninitialized stack memory (e.g., when PHC is disabled or in blocked state) or invalid hardware values. Passing these to userspace via the PTP ioctl is both a security issue (information leak) and a correctness bug.

Fix by checking the return code after releasing the lock and only setting the output timestamp on success.

CVSS

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

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).

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-2026-63837",
  "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": "e0ea34158ee8c4f7536cd781010339ff28c0d24c",
              "lessThan": "bddf59818ae5102e6d82a4dae5add6df8da38fb0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c",
              "lessThan": "edcb049d836e175e7b3d5e0d05657104545b5e65",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c",
              "lessThan": "24a08d7d6218d60c033015cf4870b6096446e734",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/amazon/ena/ena_phc.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/amazon/ena/ena_phc.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-19T15:16:50.480",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/24a08d7d6218d60c033015cf4870b6096446e734",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bddf59818ae5102e6d82a4dae5add6df8da38fb0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/edcb049d836e175e7b3d5e0d05657104545b5e65",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ena: PHC: Check return code before setting timestamp output\n\nena_phc_gettimex64() is setting the output parameter regardless\nof whether ena_com_phc_get_timestamp() succeeded or failed.\n\nWhen ena_com_phc_get_timestamp() returns an error, the timestamp\nparameter may contain uninitialized stack memory (e.g., when PHC is\ndisabled or in blocked state) or invalid hardware values. Passing\nthese to userspace via the PTP ioctl is both a security issue\n(information leak) and a correctness bug.\n\nFix by checking the return code after releasing the lock and only\nsetting the output timestamp on success."
    }
  ],
  "lastModified": "2026-07-27T17:44:23.777",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}