{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-97923",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-97923",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-25T10:22:42.300Z",
    "updatedAt": "2026-10-19T09:10:50.106Z",
    "importedAt": "2026-10-24T01:58:41.756Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "tracing: Free histogram the var ref when its initialization fails",
      "summary": "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.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "608b7751926ec08fae6a1ac4e7308195da68c362"
            },
            {
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4870f9071c9ea3c1423a07741b85a794db30d672"
            },
            {
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "352f84a381e7b4651b30366e93cb858f3fa9c91a"
            },
            {
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4924328d6991f25b65bb7c8ff5d56c2a9b254851"
            },
            {
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "74375caa20fe5165807b4334c783d1790b01f02a"
            },
            {
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "222abcbe7866fef04563b6eb89fb21f627dcbc77"
            },
            {
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a69baeac38677270656e85753d93856a076dee57"
            },
            {
              "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "516001d53e6b2ea95a251ee2ef54a1a689a3fd58"
            },
            {
              "version": "836717841a30d7845cdf9cb806ee0ff3bfa7135a",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4.19.100",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.20"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.0"
            },
            {
              "version": "5.10.271",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.222",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.189",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.158",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.111",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.53",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}