{
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    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.6.141"
            },
            {
              "fixed": "6.6.142"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
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            {
              "introduced": "6.12.91"
            },
            {
              "fixed": "6.12.92"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
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            {
              "introduced": "6.18.33"
            },
            {
              "fixed": "6.18.34"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.0.10"
            },
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              "fixed": "7.0.11"
            }
          ],
          "type": "ECOSYSTEM"
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  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64028.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Avoid NULL return from hist_field_name() on truncation\n\nhist_field_name() returns \"\" everywhere except the fully-qualified\nVAR_REF/EXPR case, where snprintf() truncation returns NULL early\nand bypasses the bottom NULL-\u003e\"\" guard. Callers don't expect NULL:\nstrcat(expr, hist_field_name(field, 0)) at trace_events_hist.c:1758\nand the strcmp() in the sort-key match loop at :4804 both deref it.\n\nsystem and event_name are bounded by MAX_EVENT_NAME_LEN, but the\nfield name on a VAR_REF is kstrdup'd from a histogram variable\nname parsed out of the trigger string and has no length cap, so\na long enough var name in a fully qualified reference can reach\nthe truncation path.\n\nKeep the length check but leave field_name as \"\" on overflow.",
  "id": "CVE-2026-64028",
  "modified": "2026-07-21T03:42:04.165644004Z",
  "published": "2026-07-19T15:39:19.102Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64028.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64028"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "tracing: Avoid NULL return from hist_field_name() on truncation"
}