CVE-2026-63992

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-19. the CNA's CVSS baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

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

tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()

In some cases, iptunnel_pmtud_check_icmp() can be called while skb transport header is not set.

This triggers an out-of-bound access, because (typeof(skb->transport_header))~0U is 65535.

Access the icmp header based on IPv4 network header, after making sure icmp->type is present in skb linear part.

Note that iptunnel_pmtud_check_icmpv6()) is fine.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic

tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/509323077ef79a26ba0c60bb556e45c12c398b2d
generic

tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cb549df9ce4ee15c9d5b19ddab12cf2128e4313c
generic

tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/43368636c663cff6e59dde93cf4b8e43ac28eb93
generic

tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a096b6e34f602950af9a2b0856cd93a5f4c276d7
generic

tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e917d0c69f01af2bb4fbea2b66d560a53b3ac7ec
generic

tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7f4f7efe7f30edd29c4988de01728bf2398217e4
generic

tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c7b7ec3e69e673c0d6b57f74d21da50c485c598e
generic

tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5a92cb45e34749865d03daf8d3500f77b5f6644c

Vendor Advisories for CVE-2026-63992(1)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-08-30ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-30ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-08-30ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (138 versions)7.0.12-1—

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 56× in last 7d / 344× 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.

Showing the most recent 100 of 414 total refreshes for this CVE.

  1. 2026-08-30 02:53 UTCEG score recompute
  2. 2026-08-30 02:53 UTCVendor advisory
  3. 2026-08-30 02:53 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 01:43 UTCVendor advisory
  7. 2026-08-28 01:43 UTCGHSA enrichment
  8. 2026-08-27 21:23 UTCEG score recompute
  9. 2026-08-27 21:23 UTCVendor advisory
  10. 2026-08-27 21:23 UTCGHSA enrichment
  11. 2026-08-27 14:25 UTCEPSS rescore
  12. 2026-08-27 11:52 UTCVendor advisory
  13. 2026-08-27 11:52 UTCGHSA enrichment
  14. 2026-08-27 02:41 UTCVendor advisory
  15. 2026-08-27 02:41 UTCGHSA enrichment
  16. 2026-08-26 22:25 UTCEG score recompute
  17. 2026-08-26 22:25 UTCVendor advisory
  18. 2026-08-26 22:25 UTCGHSA enrichment
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-26 13:42 UTCVendor advisory
  21. 2026-08-26 13:42 UTCGHSA enrichment
  22. 2026-08-26 08:58 UTCVendor advisory
  23. 2026-08-26 08:58 UTCGHSA enrichment
  24. 2026-08-26 04:32 UTCVendor advisory
  25. 2026-08-26 04:32 UTCGHSA enrichment
Show 75 more
  1. 2026-08-25 23:45 UTCVendor advisory
  2. 2026-08-25 23:45 UTCGHSA enrichment
  3. 2026-08-25 18:48 UTCEG score recompute
  4. 2026-08-25 18:48 UTCGHSA enrichment
  5. 2026-08-25 13:49 UTCEPSS rescore
  6. 2026-08-25 12:30 UTCVendor advisory
  7. 2026-08-25 12:30 UTCGHSA enrichment
  8. 2026-08-25 08:00 UTCVendor advisory
  9. 2026-08-25 07:59 UTCGHSA enrichment
  10. 2026-08-25 03:41 UTCVendor advisory
  11. 2026-08-25 03:41 UTCGHSA enrichment
  12. 2026-08-24 23:25 UTCVendor advisory
  13. 2026-08-24 23:25 UTCGHSA enrichment
  14. 2026-08-24 19:09 UTCEG score recompute
  15. 2026-08-24 19:09 UTCVendor advisory
  16. 2026-08-24 19:09 UTCGHSA enrichment
  17. 2026-08-24 12:31 UTCEG score recompute
  18. 2026-08-24 12:31 UTCVendor advisory
  19. 2026-08-24 12:31 UTCGHSA enrichment
  20. 2026-08-24 08:03 UTCVendor advisory
  21. 2026-08-24 08:03 UTCGHSA enrichment
  22. 2026-08-24 03:44 UTCVendor advisory
  23. 2026-08-24 03:43 UTCGHSA enrichment
  24. 2026-08-23 23:03 UTCVendor advisory
  25. 2026-08-23 23:03 UTCGHSA enrichment
  26. 2026-08-23 18:18 UTCVendor advisory
  27. 2026-08-23 18:18 UTCGHSA enrichment
  28. 2026-08-23 14:02 UTCVendor advisory
  29. 2026-08-23 14:02 UTCGHSA enrichment
  30. 2026-08-23 09:46 UTCVendor advisory
  31. 2026-08-23 09:46 UTCGHSA enrichment
  32. 2026-08-23 05:30 UTCVendor advisory
  33. 2026-08-23 05:30 UTCGHSA enrichment
  34. 2026-08-23 01:14 UTCEG score recompute
  35. 2026-08-23 01:14 UTCVendor advisory
  36. 2026-08-23 01:13 UTCGHSA enrichment
  37. 2026-08-23 00:19 UTCEPSS rescore
  38. 2026-08-22 20:57 UTCVendor advisory
  39. 2026-08-22 20:57 UTCGHSA enrichment
  40. 2026-08-22 16:41 UTCVendor advisory
  41. 2026-08-22 16:41 UTCGHSA enrichment
  42. 2026-08-22 12:10 UTCVendor advisory
  43. 2026-08-22 12:10 UTCGHSA enrichment
  44. 2026-08-22 07:28 UTCVendor advisory
  45. 2026-08-22 07:28 UTCGHSA enrichment
  46. 2026-08-22 03:12 UTCEG score recompute
  47. 2026-08-22 03:12 UTCVendor advisory
  48. 2026-08-22 03:12 UTCGHSA enrichment
  49. 2026-08-21 23:49 UTCEPSS rescore
  50. 2026-08-21 22:50 UTCVendor advisory
  51. 2026-08-21 22:50 UTCGHSA enrichment
  52. 2026-08-21 18:33 UTCVendor advisory
  53. 2026-08-21 18:33 UTCGHSA enrichment
  54. 2026-08-21 14:13 UTCVendor advisory
  55. 2026-08-21 14:13 UTCGHSA enrichment
  56. 2026-08-21 09:57 UTCVendor advisory
  57. 2026-08-21 09:57 UTCGHSA enrichment
  58. 2026-08-21 05:41 UTCVendor advisory
  59. 2026-08-21 05:41 UTCGHSA enrichment
  60. 2026-08-21 01:24 UTCEG score recompute
  61. 2026-08-21 01:24 UTCVendor advisory
  62. 2026-08-21 01:24 UTCGHSA enrichment
  63. 2026-08-20 22:55 UTCEPSS rescore
  64. 2026-08-20 21:08 UTCVendor advisory
  65. 2026-08-20 21:08 UTCGHSA enrichment
  66. 2026-08-20 16:51 UTCVendor advisory
  67. 2026-08-20 16:51 UTCGHSA enrichment
  68. 2026-08-20 12:14 UTCVendor advisory
  69. 2026-08-20 12:14 UTCGHSA enrichment
  70. 2026-08-20 07:51 UTCVendor advisory
  71. 2026-08-20 07:51 UTCGHSA enrichment
  72. 2026-08-20 03:35 UTCVendor advisory
  73. 2026-08-20 03:35 UTCGHSA enrichment
  74. 2026-08-19 23:04 UTCEG score recompute
  75. 2026-08-19 23:04 UTCVendor advisory

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-63992?
CVE-2026-63992 is a critical vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: tunnels: do not assume transport header in iptunnelpmtudcheck_icmp() In some cases, iptunnelpmtudcheck_icmp() can be called while skb transport header is not set. This triggers an out-of-bound access, because…
When was CVE-2026-63992 disclosed?
CVE-2026-63992 was first published in the National Vulnerability Database on July 19, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63992 actively exploited?
CVE-2026-63992 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.4% of all scored CVEs.
What is the CVSS score of CVE-2026-63992?
CVE-2026-63992 has a CVSS v4.0 base score of 9.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-63992?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63992, 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.

Dependency Blast Radius

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