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CVE-2026-97923

Estado: RecibidaSin puntuar—

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

tracing: Free histogram the var ref when its initialization fails

create_var_ref() allocates a VAR_REF hist_field and then calls init_var_ref() to fill it in. When that fails the field is leaked.

commit 656fe2ba85e8 ("tracing: Use hist trigger's var_ref array to destroy var_refs") made destroy_hist_field() return early for HIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's var_refs[] array instead. create_var_ref() adds the field to that array only after init_var_ref() has succeeded, so on this path the field is in neither place and nothing frees it. The call was correct when it was written, before var refs were taken out of destroy_hist_field().

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init_var_ref() cannot free it either. The caller owns the field, so init_var_ref() undoes only its own string allocations and leaves the field alone. Freeing it there would leave create_var_ref() passing freed memory to destroy_hist_field(), which reads its flags.

Call __destroy_hist_field(), which frees the field without consulting the flag.

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-2026-97923",
  "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": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "lessThan": "608b7751926ec08fae6a1ac4e7308195da68c362",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "lessThan": "4870f9071c9ea3c1423a07741b85a794db30d672",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "lessThan": "352f84a381e7b4651b30366e93cb858f3fa9c91a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "lessThan": "4924328d6991f25b65bb7c8ff5d56c2a9b254851",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "lessThan": "74375caa20fe5165807b4334c783d1790b01f02a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "lessThan": "222abcbe7866fef04563b6eb89fb21f627dcbc77",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "lessThan": "a69baeac38677270656e85753d93856a076dee57",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "lessThan": "516001d53e6b2ea95a251ee2ef54a1a689a3fd58",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "836717841a30d7845cdf9cb806ee0ff3bfa7135a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4.19.100",
              "lessThan": "4.20",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "kernel/trace/trace_events_hist.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "kernel/trace/trace_events_hist.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:19.413",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/222abcbe7866fef04563b6eb89fb21f627dcbc77",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/352f84a381e7b4651b30366e93cb858f3fa9c91a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4870f9071c9ea3c1423a07741b85a794db30d672",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4924328d6991f25b65bb7c8ff5d56c2a9b254851",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/516001d53e6b2ea95a251ee2ef54a1a689a3fd58",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/608b7751926ec08fae6a1ac4e7308195da68c362",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/74375caa20fe5165807b4334c783d1790b01f02a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a69baeac38677270656e85753d93856a076dee57",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Free histogram the var ref when its initialization fails\n\ncreate_var_ref() allocates a VAR_REF hist_field and then calls\ninit_var_ref() to fill it in. When that fails the field is leaked.\n\ncommit 656fe2ba85e8 (\"tracing: Use hist trigger's var_ref array to destroy\nvar_refs\") made destroy_hist_field() return early for\nHIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's\nvar_refs[] array instead. create_var_ref() adds the field to that array\nonly after init_var_ref() has succeeded, so on this path the field is in\nneither place and nothing frees it. The call was correct when it was\nwritten, before var refs were taken out of destroy_hist_field().\n\ninit_var_ref() cannot free it either. The caller owns the field, so\ninit_var_ref() undoes only its own string allocations and leaves the\nfield alone. Freeing it there would leave create_var_ref() passing freed\nmemory to destroy_hist_field(), which reads its flags.\n\nCall __destroy_hist_field(), which frees the field without consulting\nthe flag."
    }
  ],
  "lastModified": "2026-10-03T11:18:10.060",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}