FKIE_CVE-2026-53218

Vulnerability from fkie_nvd - Published: 2026-06-25 09:16 - Updated: 2026-06-30 14:44
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag nft_exthdr_init() passes user-controlled priv->len to nft_parse_register_store(), which marks that many bytes in the register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT is set, the eval paths write only 1 byte (nft_reg_store8) or 4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4, registers beyond the first are never written, retaining uninitialized stack data from nft_regs. Bail out if userspace requests too much data when F_PRESENT is set.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/19748967d59c31d24d21d40b728570788310b237
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/46fc15a044e9938e7ea77786fb37edd2cd74f031
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67b27434c43b68a97becda98c9f0c8cf6cba2134
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/772cecf198da732faebb5dcfc46d66a505be8495
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78069a6d8bc86c9e036eb82c2af4a19cc1871a53
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd513e43b4b2bd1de39e2367bc4261c699a8652f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_exthdr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6",
              "status": "affected",
              "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
              "versionType": "git"
            },
            {
              "lessThan": "19748967d59c31d24d21d40b728570788310b237",
              "status": "affected",
              "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
              "versionType": "git"
            },
            {
              "lessThan": "46fc15a044e9938e7ea77786fb37edd2cd74f031",
              "status": "affected",
              "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
              "versionType": "git"
            },
            {
              "lessThan": "cd513e43b4b2bd1de39e2367bc4261c699a8652f",
              "status": "affected",
              "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
              "versionType": "git"
            },
            {
              "lessThan": "67b27434c43b68a97becda98c9f0c8cf6cba2134",
              "status": "affected",
              "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
              "versionType": "git"
            },
            {
              "lessThan": "78069a6d8bc86c9e036eb82c2af4a19cc1871a53",
              "status": "affected",
              "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
              "versionType": "git"
            },
            {
              "lessThan": "f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265",
              "status": "affected",
              "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
              "versionType": "git"
            },
            {
              "lessThan": "772cecf198da732faebb5dcfc46d66a505be8495",
              "status": "affected",
              "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_exthdr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_exthdr: fix register tracking for F_PRESENT flag\n\nnft_exthdr_init() passes user-controlled priv-\u003elen to\nnft_parse_register_store(), which marks that many bytes in the\nregister bitmap as initialized.  However, when NFT_EXTHDR_F_PRESENT\nis set, the eval paths write only 1 byte (nft_reg_store8) or\n4 bytes (*dest = 0 on TCP/DCCP error path).  When len \u003e 4,\nregisters beyond the first are never written, retaining\nuninitialized stack data from nft_regs.\n\nBail out if userspace requests too much data when F_PRESENT is set."
    }
  ],
  "id": "CVE-2026-53218",
  "lastModified": "2026-06-30T14:44:27.313",
  "metrics": {},
  "published": "2026-06-25T09:16:39.500",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/19748967d59c31d24d21d40b728570788310b237"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/46fc15a044e9938e7ea77786fb37edd2cd74f031"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/67b27434c43b68a97becda98c9f0c8cf6cba2134"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/772cecf198da732faebb5dcfc46d66a505be8495"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/78069a6d8bc86c9e036eb82c2af4a19cc1871a53"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cd513e43b4b2bd1de39e2367bc4261c699a8652f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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