{
  "id": "cve-2021-22555",
  "cveID": "CVE-2021-22555",
  "vendor": "Linux",
  "product": "Kernel",
  "vulnerabilityName": "Linux Kernel Heap Out-of-Bounds Write Vulnerability",
  "shortDescription": "Linux Kernel contains a heap out-of-bounds write vulnerability that could allow an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space.",
  "requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
  "dateAdded": "2025-10-06",
  "dueDate": "2025-10-27",
  "knownRansomware": false,
  "cwes": [
    "CWE-787"
  ],
  "notes": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21 ; https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d ; https://security.netapp.com/advisory/ntap-20210805-0010/ ; https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528 ; https://nvd.nist.gov/vuln/detail/CVE-2021-22555",
  "sources": [
    {
      "label": "NVD",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22555"
    },
    {
      "label": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
    },
    {
      "label": "git.kernel.org",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21"
    },
    {
      "label": "git.kernel.org",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d"
    },
    {
      "label": "security.netapp.com",
      "url": "https://security.netapp.com/advisory/ntap-20210805-0010/"
    },
    {
      "label": "github.com",
      "url": "https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528"
    },
    {
      "label": "nvd.nist.gov",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22555"
    }
  ],
  "cvss": {
    "score": 7.8,
    "severity": "HIGH",
    "version": "3.1",
    "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  },
  "epss": {
    "score": 0.78684,
    "percentile": 0.99562
  },
  "timeline": [
    {
      "date": "2025-10-06",
      "event": "Added to the CISA KEV catalog"
    },
    {
      "date": "2025-10-27",
      "event": "CISA remediation due date (BOD 22-01)"
    }
  ],
  "status": "past due"
}