{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "89aa3619d141d6cfb6040a561aebb6d99d3e2285"
            },
            {
              "fixed": "b965977126a90e01825814c859ba4788691eddd3"
            },
            {
              "fixed": "2200fe1d6148b78e1b8f00f4b2bd47760015077f"
            },
            {
              "fixed": "6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0"
            },
            {
              "fixed": "6d25ffca055a77787c21a36b66c253f76239411b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.10.0"
            },
            {
              "fixed": "6.12.113"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.57"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99064.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncipso: adjust cached option offsets when removing CIPSO\n\ncipso_v4_skbuff_delattr() removes the CIPSO bytes but does not adjust\ncached offsets for options that follow them.\n\nFor example, with a valid 10-byte CIPSO option followed by a seven-byte\nRR option, parsing records rr at offset 30.  Removing CIPSO moves RR to\noffset 20, while the cached offset remains 30.  Consumers such as\nip_forward_options() and __ip_options_echo() then access the wrong bytes;\nthe latter may interpret packet data as the option length and copy it into\nfixed-size option storage.\n\nMirror cipso_v4_delopt() and subtract cipso_len from the srr, rr, ts and\nrouter_alert offsets when they follow CIPSO.  cipso_len is the distance\nthe first memmove() shifts those options.  The later header move and\nnetwork-header reset relocate the bytes and their offset base together.",
  "id": "CVE-2026-99064",
  "modified": "2026-10-28T02:30:50.257661972Z",
  "published": "2026-10-23T12:23:05.854Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99064.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99064"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "cipso: adjust cached option offsets when removing CIPSO"
}