Vulnerability-Lookup

GHSA-9HFH-P7QH-475C

Vulnerability from github – Published: 2026-06-24 09:30 – Updated: 2026-06-28 09:31

Details

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

netfilter: ip6t_hbh: reject oversized option lists

struct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors, but hbh_mt6_check() does not reject larger optsnr values supplied from userspace.

Validate optsnr in the rule setup path so only match data that fits the fixed-size opts array can be installed. This follows the existing xtables pattern of rejecting invalid user-provided counts in checkentry() and keeps the packet matching path unchanged.

struct ip6t_opts has a fixed opts[IP6T_OPTS_OPTSNR] array, where IP6T_OPTS_OPTSNR is 16, then off-by-one array access is possible:

[ 137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29 [ 137.926167][ T8692] index 16 is out of range for type '__u16 [16]'

Severity

7.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-52915"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-129"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T08:16:21Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_hbh: reject oversized option lists\n\nstruct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors,\nbut hbh_mt6_check() does not reject larger optsnr values supplied from\nuserspace.\n\nValidate optsnr in the rule setup path so only match data that fits the\nfixed-size opts array can be installed. This follows the existing xtables\npattern of rejecting invalid user-provided counts in checkentry() and\nkeeps the packet matching path unchanged.\n\n`struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array,\nwhere `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible:\n\n[  137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29\n[  137.926167][ T8692] index 16 is out of range for type \u0027__u16 [16]\u0027",
  "id": "GHSA-9hfh-p7qh-475c",
  "modified": "2026-06-28T09:31:35Z",
  "published": "2026-06-24T09:30:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52915"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-52915 (GCVE-0-2026-52915)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-08-05 12:31

Title

netfilter: ip6t_hbh: reject oversized option lists

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_hbh: reject oversized option lists struct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors, but hbh_mt6_check() does not reject larger optsnr values supplied from userspace. Validate optsnr in the rule setup path so only match data that fits the fixed-size opts array can be installed. This follows the existing xtables pattern of rejecting invalid user-provided counts in checkentry() and keeps the packet matching path unchanged. `struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array, where `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible: [ 137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29 [ 137.926167][ T8692] index 16 is out of range for type '__u16 [16]'

Severity

7.1 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/2d523ba48d4ecc46a…
https://git.kernel.org/stable/c/588933f1a2ca5ff99…
https://git.kernel.org/stable/c/784aadea7a108c9f9…
https://git.kernel.org/stable/c/41ec2e242f1702e83…
https://git.kernel.org/stable/c/db0250470f023f159…
https://git.kernel.org/stable/c/57b0ac5e1b46f1f03…
https://git.kernel.org/stable/c/6feb43c0995ab3a9c…
https://git.kernel.org/stable/c/4322dcde6b4173c2d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2d523ba48d4ecc46acfb6aba548292cfcce1ac02 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 588933f1a2ca5ff99274f8c9f25dc3a25d0191c3 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 784aadea7a108c9f90985683caa87fb0198c6a39 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 41ec2e242f1702e8370ddfe14d22b7a766021c3e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < db0250470f023f159094052c0bd5ab026a88ae93 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 57b0ac5e1b46f1f0338dff392ef2092e2871b412 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6feb43c0995ab3a9c826707eb46541a1696fe4f7 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4322dcde6b4173c2d8e8e6118ed290794263bcc8 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.142 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/netfilter/ip6t_hbh.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2d523ba48d4ecc46acfb6aba548292cfcce1ac02",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "588933f1a2ca5ff99274f8c9f25dc3a25d0191c3",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "784aadea7a108c9f90985683caa87fb0198c6a39",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "41ec2e242f1702e8370ddfe14d22b7a766021c3e",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "db0250470f023f159094052c0bd5ab026a88ae93",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "57b0ac5e1b46f1f0338dff392ef2092e2871b412",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "6feb43c0995ab3a9c826707eb46541a1696fe4f7",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "4322dcde6b4173c2d8e8e6118ed290794263bcc8",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/netfilter/ip6t_hbh.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.142",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.92",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_hbh: reject oversized option lists\n\nstruct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors,\nbut hbh_mt6_check() does not reject larger optsnr values supplied from\nuserspace.\n\nValidate optsnr in the rule setup path so only match data that fits the\nfixed-size opts array can be installed. This follows the existing xtables\npattern of rejecting invalid user-provided counts in checkentry() and\nkeeps the packet matching path unchanged.\n\n`struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array,\nwhere `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible:\n\n[  137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29\n[  137.926167][ T8692] index 16 is out of range for type \u0027__u16 [16]\u0027"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The attacker must locally install a malformed IPv6 xtables/nft_compat hbh or dst match rule; the later packet evaluation can be driven by traffic, but the vulnerable state is created through local netfilter control interfaces.\nAC:L - No race or rare external condition is required: the attacker supplies optsnr \u003e 16 and then causes matching IPv6 extension-header traffic to be evaluated.\nPR:L - Rule installation requires CAP_NET_ADMIN in the target network namespace, and netfilter configuration is reachable by an unprivileged local user via a user+network namespace on systems allowing user namespaces.\nUI:N - Once the attacker has local access and required namespace capability, no victim action is needed to install the malformed rule or trigger packet evaluation.\nS:U - The impact remains within the kernel/network namespace security authority; this is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The oversized optsnr causes out-of-bounds reads past the fixed opts[16] array into adjacent kernel memory, and repeated attacker-controlled packet comparisons can serve as a kernel-memory disclosure oracle.\nI:N - The vulnerable code only reads out-of-bounds values and compares them with packet option bytes; it does not provide an out-of-bounds write or direct data modification primitive.\nA:H - The out-of-bounds array access can run past the installed match object during packet evaluation and was observed by UBSAN; in hardened or unlucky memory layouts this can produce an oops/panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:37.987Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02"
        },
        {
          "url": "https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39"
        },
        {
          "url": "https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e"
        },
        {
          "url": "https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93"
        },
        {
          "url": "https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412"
        },
        {
          "url": "https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8"
        }
      ],
      "title": "netfilter: ip6t_hbh: reject oversized option lists",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52915",
    "datePublished": "2026-06-24T07:14:12.569Z",
    "dateReserved": "2026-06-09T07:44:35.367Z",
    "dateUpdated": "2026-08-05T12:31:37.987Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.