{
  "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-2023-53221",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53221",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2025-09-15T14:21:50.053Z",
    "updatedAt": "2026-05-23T15:28:16.750Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "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": "bpf: Fix memleak due to fentry attach failure",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix memleak due to fentry attach failure\n\nIf it fails to attach fentry, the allocated bpf trampoline image will be\nleft in the system. That can be verified by checking /proc/kallsyms.\n\nThis meamleak can be verified by a simple bpf program as follows:\n\n  SEC(\"fentry/trap_init\")\n  int fentry_run()\n  {\n      return 0;\n  }\n\nIt will fail to attach trap_init because this function is freed after\nkernel init, and then we can find the trampoline image is left in the\nsystem by checking /proc/kallsyms.\n\n  $ tail /proc/kallsyms\n  ffffffffc0613000 t bpf_trampoline_6442453466_1  [bpf]\n  ffffffffc06c3000 t bpf_trampoline_6442453466_1  [bpf]\n\n  $ bpftool btf dump file /sys/kernel/btf/vmlinux | grep \"FUNC 'trap_init'\"\n  [2522] FUNC 'trap_init' type_id=119 linkage=static\n\n  $ echo $((6442453466 & 0x7fffffff))\n  2522\n\nNote that there are two left bpf trampoline images, that is because the\nlibbpf will fallback to raw tracepoint if -EINVAL is returned.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "e21aa341785c679dd409c8cb71f864c00fe6c463",
              "status": "affected",
              "versionType": "git",
              "lessThan": "20109ddd5bea2c24d790debf5d02584ef24c3f5e"
            },
            {
              "version": "e21aa341785c679dd409c8cb71f864c00fe6c463",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f72c67d1a82dada7d6d504c806e111e913721a30"
            },
            {
              "version": "e21aa341785c679dd409c8cb71f864c00fe6c463",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6aa27775db63ba8c7c73891c7dfb71ddc230c48d"
            },
            {
              "version": "e21aa341785c679dd409c8cb71f864c00fe6c463",
              "status": "affected",
              "versionType": "git",
              "lessThan": "108598c39eefbedc9882273ac0df96127a629220"
            },
            {
              "version": "e21d2b92354b3cd25dd774ebb0f0e52ff04a7861",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "85d177f56e5256e14b74a65940f981f6e3e8bb32",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.10.28",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.11"
            },
            {
              "version": "5.11.11",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.12"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.12",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.12"
            },
            {
              "version": "6.1.39",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.3.13",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.3.*"
            },
            {
              "version": "6.4.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "version": "6.5",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}