FKIE_CVE-2026-63837

Vulnerability from fkie_nvd - Published: 2026-07-19 15:16 - Updated: 2026-07-19 15:16
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/24a08d7d6218d60c033015cf4870b6096446e734
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bddf59818ae5102e6d82a4dae5add6df8da38fb0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/edcb049d836e175e7b3d5e0d05657104545b5e65
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/amazon/ena/ena_phc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bddf59818ae5102e6d82a4dae5add6df8da38fb0",
              "status": "affected",
              "version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c",
              "versionType": "git"
            },
            {
              "lessThan": "edcb049d836e175e7b3d5e0d05657104545b5e65",
              "status": "affected",
              "version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c",
              "versionType": "git"
            },
            {
              "lessThan": "24a08d7d6218d60c033015cf4870b6096446e734",
              "status": "affected",
              "version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/amazon/ena/ena_phc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-63837",
  "lastModified": "2026-07-19T15:16:50.480",
  "metrics": {},
  "published": "2026-07-19T15:16:50.480",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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