FKIE_CVE-2026-64028

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-19 16:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Avoid NULL return from hist_field_name() on truncation hist_field_name() returns "" everywhere except the fully-qualified VAR_REF/EXPR case, where snprintf() truncation returns NULL early and bypasses the bottom NULL->"" guard. Callers don't expect NULL: strcat(expr, hist_field_name(field, 0)) at trace_events_hist.c:1758 and the strcmp() in the sort-key match loop at :4804 both deref it. system and event_name are bounded by MAX_EVENT_NAME_LEN, but the field name on a VAR_REF is kstrdup'd from a histogram variable name parsed out of the trigger string and has no length cap, so a long enough var name in a fully qualified reference can reach the truncation path. Keep the length check but leave field_name as "" on overflow.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_hist.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e3f5d42cdc2f167719564693675f1eead81378ea",
              "status": "affected",
              "version": "2e8578364061c4e88ae33bc20c2d6f64f365f6a2",
              "versionType": "git"
            },
            {
              "lessThan": "37377b39ff86dacbc533275c1155210d4fd5dc91",
              "status": "affected",
              "version": "dfd1cd57ee6067301841b7b0967c70f910a51150",
              "versionType": "git"
            },
            {
              "lessThan": "0402a1d3ddec565132867337ed44514a09d84728",
              "status": "affected",
              "version": "e5c223f46c2e0691461dd97510c15e1f77148872",
              "versionType": "git"
            },
            {
              "lessThan": "e91687643c440ca3997d67646e6f80b92edc6703",
              "status": "affected",
              "version": "9399a92989354e34086f9a5c379493217df83c5e",
              "versionType": "git"
            },
            {
              "lessThan": "be4e99038c1603fa6b329d8ee3e364825e17c353",
              "status": "affected",
              "version": "3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0",
              "versionType": "git"
            },
            {
              "lessThan": "d6c8b3ebdcdb12b59ad4212acb137cc56cae453d",
              "status": "affected",
              "version": "0402c60abe769098d77f3b3bd1e29a97922b614b",
              "versionType": "git"
            },
            {
              "lessThan": "915c1254fe0788abddc31095b360e9dc98907a34",
              "status": "affected",
              "version": "6929e650db8451a9975ac0a631ba2d6e5d1e80ba",
              "versionType": "git"
            },
            {
              "lessThan": "576ec047d20b368b43c4d5db98c4f2e0f3c101ec",
              "status": "affected",
              "version": "5ec1d1e97de134beed3a5b08235a60fc1c51af96",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_hist.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6.6.142",
              "status": "affected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.92",
              "status": "affected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.34",
              "status": "affected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThan": "7.0.11",
              "status": "affected",
              "version": "7.0.10",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027t 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\u0027d 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",
  "lastModified": "2026-07-19T16:17:42.877",
  "metrics": {},
  "published": "2026-07-19T16:17:42.877",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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