CVE-2026-52915

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-24. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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]'

CVSS v3
7.1
EG Score
7.1(high)
EPSS
2.6%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 28, 2026

Advisory Details (8)

Auto-updated Jun 30, 2026
No patch confirmed yet.
generic

netfilter: ip6t_hbh: reject oversized option lists - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93
generic

netfilter: ip6t_hbh: reject oversized option lists - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39
generic

netfilter: ip6t_hbh: reject oversized option lists - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7
generic

netfilter: ip6t_hbh: reject oversized option lists - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3
generic

netfilter: ip6t_hbh: reject oversized option lists - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412
generic

netfilter: ip6t_hbh: reject oversized option lists - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8
generic

netfilter: ip6t_hbh: reject oversized option lists - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e
generic

netfilter: ip6t_hbh: reject oversized option lists - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02

Vendor Advisories for CVE-2026-52915(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 44× in last 7d / 57× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 20:10 UTCEG score recompute
  2. 2026-07-06 20:10 UTCVendor advisory
  3. 2026-07-06 20:10 UTCGHSA enrichment
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 07:41 UTCEG score recompute
  7. 2026-07-06 07:41 UTCVendor advisory
  8. 2026-07-06 07:41 UTCGHSA enrichment
  9. 2026-07-05 19:11 UTCEG score recompute
  10. 2026-07-05 19:11 UTCVendor advisory
  11. 2026-07-05 19:11 UTCGHSA enrichment
  12. 2026-07-05 06:47 UTCEG score recompute
  13. 2026-07-05 06:47 UTCVendor advisory
  14. 2026-07-05 06:47 UTCGHSA enrichment
  15. 2026-07-05 02:30 UTCEPSS rescore
  16. 2026-07-04 18:23 UTCEG score recompute
  17. 2026-07-04 18:23 UTCVendor advisory
  18. 2026-07-04 18:23 UTCGHSA enrichment
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 05:58 UTCEG score recompute
  21. 2026-07-04 05:58 UTCVendor advisory
  22. 2026-07-04 05:58 UTCGHSA enrichment
  23. 2026-07-03 17:19 UTCEG score recompute
  24. 2026-07-03 17:19 UTCVendor advisory
  25. 2026-07-03 17:19 UTCGHSA enrichment
Show 32 more
  1. 2026-07-03 04:54 UTCEG score recompute
  2. 2026-07-03 04:54 UTCVendor advisory
  3. 2026-07-03 04:54 UTCGHSA enrichment
  4. 2026-07-02 16:31 UTCEG score recompute
  5. 2026-07-02 16:31 UTCVendor advisory
  6. 2026-07-02 16:31 UTCGHSA enrichment
  7. 2026-07-02 04:07 UTCEG score recompute
  8. 2026-07-02 04:07 UTCVendor advisory
  9. 2026-07-02 04:07 UTCGHSA enrichment
  10. 2026-07-01 15:43 UTCEG score recompute
  11. 2026-07-01 15:43 UTCVendor advisory
  12. 2026-07-01 15:43 UTCGHSA enrichment
  13. 2026-07-01 15:07 UTCEPSS rescore
  14. 2026-07-01 03:18 UTCEG score recompute
  15. 2026-07-01 03:18 UTCVendor advisory
  16. 2026-07-01 03:18 UTCGHSA enrichment
  17. 2026-06-30 14:55 UTCEG score recompute▲ 7.10
  18. 2026-06-30 14:55 UTCVendor advisory
  19. 2026-06-30 14:54 UTCGHSA enrichment
  20. 2026-06-29 14:06 UTCEPSS rescore
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-28 14:07 UTCEPSS rescore
  23. 2026-06-28 07:52 UTCMITRE cvelistV5CVSS v3 → 7.1 · severity → HIGH
  24. 2026-06-28 04:56 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
  26. 2026-06-27 11:46 UTCEG score recompute
  27. 2026-06-27 11:46 UTCGHSA enrichment
  28. 2026-06-27 03:08 UTCEPSS rescore
  29. 2026-06-25 13:49 UTCEPSS rescore
  30. 2026-06-24 14:05 UTCEPSS rescore
  31. 2026-06-24 08:42 UTCEG score recompute
  32. 2026-06-24 08:40 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-52915?
CVE-2026-52915 is a high vulnerability published on June 24, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_hbh: reject oversized option lists struct ip6topts stores at most IP6TOPTS_OPTSNR option descriptors, but hbhmt6check() does not reject larger optsnr values supplied from userspace. Validate optsnr in the rule setup…
When was CVE-2026-52915 disclosed?
CVE-2026-52915 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on June 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52915 actively exploited?
CVE-2026-52915 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-52915?
CVE-2026-52915 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-52915?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52915, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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