Vulnerability-Lookup

CVE-2026-99064 (GCVE-0-2026-99064)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:23 – Updated: 2026-10-24 14:10

Title

cipso: adjust cached option offsets when removing CIPSO

Summary

In the Linux kernel, the following vulnerability has been resolved: cipso: adjust cached option offsets when removing CIPSO cipso_v4_skbuff_delattr() removes the CIPSO bytes but does not adjust cached offsets for options that follow them. For example, with a valid 10-byte CIPSO option followed by a seven-byte RR option, parsing records rr at offset 30. Removing CIPSO moves RR to offset 20, while the cached offset remains 30. Consumers such as ip_forward_options() and __ip_options_echo() then access the wrong bytes; the latter may interpret packet data as the option length and copy it into fixed-size option storage. Mirror cipso_v4_delopt() and subtract cipso_len from the srr, rr, ts and router_alert offsets when they follow CIPSO. cipso_len is the distance the first memmove() shifts those options. The later header move and network-header reset relocate the bytes and their offset base together.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7067 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/b965977126a90e018…
https://git.kernel.org/stable/c/2200fe1d6148b78e1…
https://git.kernel.org/stable/c/6e49d611a9cfbaac9…
https://git.kernel.org/stable/c/6d25ffca055a77787…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 89aa3619d141d6cfb6040a561aebb6d99d3e2285 , < b965977126a90e01825814c859ba4788691eddd3 (git) Affected: 89aa3619d141d6cfb6040a561aebb6d99d3e2285 , < 2200fe1d6148b78e1b8f00f4b2bd47760015077f (git) Affected: 89aa3619d141d6cfb6040a561aebb6d99d3e2285 , < 6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0 (git) Affected: 89aa3619d141d6cfb6040a561aebb6d99d3e2285 , < 6d25ffca055a77787c21a36b66c253f76239411b (git)	guessed
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/cipso_ipv4.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b965977126a90e01825814c859ba4788691eddd3",
              "status": "affected",
              "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
              "versionType": "git"
            },
            {
              "lessThan": "2200fe1d6148b78e1b8f00f4b2bd47760015077f",
              "status": "affected",
              "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
              "versionType": "git"
            },
            {
              "lessThan": "6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0",
              "status": "affected",
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              "versionType": "git"
            },
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/cipso_ipv4.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.57",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.11",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - A remote peer can send an IPv4 datagram containing valid CIPSO followed by RR/TS; ip_rcv()-\u003eip_rcv_options() caches their wire offsets, then selinux_ip_forward()-\u003enetlbl_skbuff_setattr()-\u003ecipso_v4_skbuff_delattr() removes CIPSO without rebasing them.\nAC:H - The strongest path requires a CONFIG_NETLABEL/SELinux forwarding gateway with network_peer_controls, a recognized CIPSO DOI, an UNLABELED egress mapping, and a later FORWARD REJECT invoking nf_send_unreach(); these non-default conditions are outside the sender\u0027s control.\nPR:N - __ip_options_compile() applies CAP_NET_RAW only when skb is NULL; received packets undergo cipso_v4_validate() and SELinux label-policy checks, but require no peer authentication, victim credentials, or target-side privileges.\nUI:N - After the datagram arrives, ip_rcv(), SELinux FORWARD relabeling, and nf_send_unreach()-\u003e__ip_options_echo() execute entirely in kernel packet handling without any victim action.\nS:U - The overwrite occurs in __ip_options_echo()\u0027s in-kernel reply-option storage and can compromise the same host kernel; it crosses no VM, IOMMU, or separate security-authority boundary.\nC:H - With stale opt-\u003err pointing into payload, __ip_options_echo() takes an attacker-chosen length and source bytes and copies up to 255 bytes into 40-byte replyopts.opt.__data; control-flow compromise from this stack overwrite can expose arbitrary kernel memory.\nI:H - The memcpy() can place 255 attacker-controlled payload bytes into the 40-byte stack destination, crossing the stack canary and saved return address in the demonstrated x86-64 layout and enabling kernel control-flow hijacking.\nA:H - The 255-byte __ip_options_echo() stack overwrite triggers KASAN or the stack canary and can panic the kernel; the packet-processing path can be invoked repeatedly with crafted IPv4 datagrams."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:10:17.979Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3"
        },
        {
          "url": "https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b"
        }
      ],
      "title": "cipso: adjust cached option offsets when removing CIPSO",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99064",
    "datePublished": "2026-10-23T12:23:05.854Z",
    "dateReserved": "2026-09-25T10:25:14.389Z",
    "dateUpdated": "2026-10-24T14:10:17.979Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-99064",
      "date": "2026-10-26",
      "epss": "0.00516",
      "percentile": "0.43653"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-25T01:06:09.000Z",
      "cve": "CVE-2026-99064",
      "id": "msrc_CVE-2026-99064",
      "initial_release_date": "2026-10-25T01:06:09.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "cipso: adjust cached option offsets when removing CIPSO",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99064.json",
      "version": "1"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/ipv4/cipso_ipv4.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "b965977126a90e01825814c859ba4788691eddd3",
                    "status": "affected",
                    "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "2200fe1d6148b78e1b8f00f4b2bd47760015077f",
                    "status": "affected",
                    "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0",
                    "status": "affected",
                    "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "6d25ffca055a77787c21a36b66c253f76239411b",
                    "status": "affected",
                    "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/ipv4/cipso_ipv4.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.10"
                  },
                  {
                    "lessThan": "6.10",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.113",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.57",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.11",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "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\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",
        "lastModified": "2026-10-24T14:16:54.507",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-23T13:17:30.253",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}

FKIE_CVE-2026-99064

Vulnerability from fkie_nvd - Published: 2026-10-23 13:17 - Updated: 2026-10-24 14:16

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/cipso_ipv4.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b965977126a90e01825814c859ba4788691eddd3",
              "status": "affected",
              "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
              "versionType": "git"
            },
            {
              "lessThan": "2200fe1d6148b78e1b8f00f4b2bd47760015077f",
              "status": "affected",
              "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
              "versionType": "git"
            },
            {
              "lessThan": "6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0",
              "status": "affected",
              "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
              "versionType": "git"
            },
            {
              "lessThan": "6d25ffca055a77787c21a36b66c253f76239411b",
              "status": "affected",
              "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/cipso_ipv4.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "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\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",
  "lastModified": "2026-10-24T14:16:54.507",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-23T13:17:30.253",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-23P2-8F9V-3G5M

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-24 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

cipso: adjust cached option offsets when removing CIPSO

cipso_v4_skbuff_delattr() removes the CIPSO bytes but does not adjust cached offsets for options that follow them.

For example, with a valid 10-byte CIPSO option followed by a seven-byte RR option, parsing records rr at offset 30. Removing CIPSO moves RR to offset 20, while the cached offset remains 30. Consumers such as ip_forward_options() and __ip_options_echo() then access the wrong bytes; the latter may interpret packet data as the option length and copy it into fixed-size option storage.

Mirror cipso_v4_delopt() and subtract cipso_len from the srr, rr, ts and router_alert offsets when they follow CIPSO. cipso_len is the distance the first memmove() shifts those options. The later header move and network-header reset relocate the bytes and their offset base together.

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99064"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:30Z",
    "severity": "HIGH"
  },
  "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": "GHSA-23p2-8f9v-3g5m",
  "modified": "2026-10-24T15:32:51Z",
  "published": "2026-10-23T15:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99064"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-99064

Vulnerability from csaf_microsoft - Published: 2026-10-25 01:06 - Updated: 2026-10-25 01:06

Summary

cipso: adjust cached option offsets when removing CIPSO

Scope

1 vulnerability in this advisory, including CVE-2026-99064.

CVE-2026-99064

Under investigation: 1 product

Open the full advisory

Sightings

Author	Source	Type	Date	Other

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Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CVE-2026-99064 (GCVE-0-2026-99064)

FKIE_CVE-2026-99064

GHSA-23P2-8F9V-3G5M

MSRC_CVE-2026-99064

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