CVE-2026-63837 (GCVE-0-2026-63837)
Vulnerability from cvelistv5
Published
2026-07-19 14:04
Modified
2026-07-19 14:04
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
Impacted products
Vendor Product Version
Linux Linux Version: e0ea34158ee8c4f7536cd781010339ff28c0d24c
Version: e0ea34158ee8c4f7536cd781010339ff28c0d24c
Version: e0ea34158ee8c4f7536cd781010339ff28c0d24c
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/amazon/ena/ena_phc.c"
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          "vendor": "Linux",
          "versions": [
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:04:33.781Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/bddf59818ae5102e6d82a4dae5add6df8da38fb0"
        },
        {
          "url": "https://git.kernel.org/stable/c/edcb049d836e175e7b3d5e0d05657104545b5e65"
        },
        {
          "url": "https://git.kernel.org/stable/c/24a08d7d6218d60c033015cf4870b6096446e734"
        }
      ],
      "title": "net: ena: PHC: Check return code before setting timestamp output",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63837",
    "datePublished": "2026-07-19T14:04:33.781Z",
    "dateReserved": "2026-07-19T07:54:57.015Z",
    "dateUpdated": "2026-07-19T14:04:33.781Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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