{
  "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-2021-3490",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-3490",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2021-06-04T01:40:20.129Z",
    "updatedAt": "2024-09-16T22:29:57.625Z",
    "importedAt": "2026-10-24T01:56:32.228Z",
    "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": "Linux kernel eBPF bitwise ops ALU32 bounds tracking",
      "summary": "The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e (\"bpf: Fix alu32 const subreg bound tracking on bitwise operations\") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 (\"bpf: Verifier, do explicit ALU32 bounds tracking\") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 (\"bpf:Fix a verifier failure with xor\") ( 5.10-rc1).",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux kernel",
          "versions": [
            {
              "version": "trunk",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "v5.13-rc4"
            },
            {
              "version": "linux-5.12.y",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "v5.12.4"
            },
            {
              "version": "linux-5.11.y",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "v5.11.21"
            },
            {
              "version": "linux-5.10.y",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "v5.10.37"
            },
            {
              "version": "v5.7-rc1",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "5.7*"
            }
          ]
        }
      ]
    }
  }
}