{
  "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-2026-98570",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-98570",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-18T15:18:36.308Z",
    "updatedAt": "2026-10-19T09:21:55.765Z",
    "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": "net: ipv6: keep room for the mac header in dst_dev_overhead()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: keep room for the mac header in dst_dev_overhead()\n\nThe seg6, ioam6 and rpl lwtunnels size their skb_cow_head() request as\nthe length they are about to push plus dst_dev_overhead(), then push the\nnew headers and rebuild the mac header below them with\nskb_mac_header_rebuild().  That rebuild needs skb->mac_len of headroom,\nbut dst_dev_overhead() leaves LL_RESERVED_SPACE() of the egress device,\n16 bytes for plain Ethernet.\n\nWhere the mac header is longer than that, as it is on ingress through a\nVLAN device with reorder_hdr off, the rebuild runs out of room:\nskb_set_mac_header(skb, -skb->mac_len) computes a negative offset,\nstores it unchecked in the u16 skb->mac_header, and the memmove that\nfollows writes skb->mac_len bytes about 64 KB past skb->head.\nForwarding plain ping6 traffic through such a device reproduces it on\nall five seg6 encapsulation modes and on the rpl and ioam6 inline paths;\nskb->mac_header comes back as 65534 on a 704-byte head.\n\nReturn the larger of the two.  The helper already returns skb->mac_len\nwhen it has no dst, so this only makes the other branch agree, and it\ncovers every caller rather than each call site in turn.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "dce525185bc92864e5a318040285ee070563fe34",
              "status": "affected",
              "versionType": "git",
              "lessThan": "36c07127924f11fc5741a780abcaaf808fe9ef13"
            },
            {
              "version": "dce525185bc92864e5a318040285ee070563fe34",
              "status": "affected",
              "versionType": "git",
              "lessThan": "87cd6b717e4069dca34e0866e57eaeb44d3b173e"
            },
            {
              "version": "8471e228448a818e4c27cab4b681b2e758e46cf5",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "c432cd18a07b623651ed15ea167bd303467004cc",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "634710a372ba65bee667c2f6e58a97658c639eab",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "c447c5a9c47bb4858ab12bf90879fe595d2b7f46",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "ab9de9c48316d2622d3bf353916b99971570e2c9",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "2fcc9f3798ef82399564d247458e69abd10e683b",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "371d8dc298b4f59e99b4564ac5d906fce0932c69",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "b26f015dfb07b6be12d005a0ed0c5c43b7bedbf3",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "c0b11dc50590e10590b39dcda79835cd32f49d00",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4c12c3c8abd8b888945d31e7bdbb0d8b73032fc5",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "25d8e065c7972dc98fd7a4cac322d5367eaede88",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4a855c5aec41bf84922224ab7a74e088776e3ac4",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "a9f0407414e16176fdbbbd298c9e18d6dfdf96bc",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "6.12.16",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.13"
            },
            {
              "version": "6.13.4",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.14"
            },
            {
              "version": "5.15.179",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.16"
            },
            {
              "version": "6.1.130",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.2"
            },
            {
              "version": "6.6.81",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.7"
            },
            {
              "version": "5.10.235",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.11"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.14",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.14"
            },
            {
              "version": "7.2.9",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}