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

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-28 06:36
VLAI
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
References
Impacted 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)
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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)
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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T06:22:57+00:00",
      "cve": "CVE-2026-52915",
      "id": "CVE-2026-52915",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: ip6t_hbh: reject oversized option lists",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52915.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-16T17:58:11Z",
      "cve": "CVE-2026-52915",
      "id": "CVE-2026-52915",
      "initial_release_date": "2026-06-25T02:20:12Z",
      "product_status:known_affected": "293",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52915",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52915.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.