CVE-2026-63968

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

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

ipv6: fix possible infinite loop in fib6_select_path()

Found while auditing the same pattern Sashiko reported in rt6_fill_node() [1]. Apply the same fix as commit f8d8ce1b515a ("ipv6: fix possible infinite loop in fib6_info_uses_dev()").

Writers holding tb6_lock can list_del_rcu(&first->fib6_siblings) without waiting for RCU readers; first->fib6_siblings.next then still points into the old ring and this softirq-side walker never reaches &first->fib6_siblings as its terminator. fib6_purge_rt() always WRITE_ONCE()s first->fib6_nsiblings to 0 before list_del_rcu(), so an inside-loop check is a reliable detach signal.

[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 5, 2026

Advisory Details (6)

Auto-updated Jul 21, 2026
No patch confirmed yet.
generic

ipv6: fix possible infinite loop in fib6_select_path() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c87cd3cb309634bc8f50a54e2079424f219ac21f
generic

ipv6: fix possible infinite loop in fib6_select_path() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ab9a10969a907b472a0196d999c08ff7144172e3
generic

ipv6: fix possible infinite loop in fib6_select_path() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9c7da87c2dc860bb17ca1ece942495d28b1ce3b9
generic

ipv6: fix possible infinite loop in fib6_select_path() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9b9d5bd6e3d4c9cecab5407604b690684b2532d2
generic

ipv6: fix possible infinite loop in fib6_select_path() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3948a7d92f7678e89e1776bb2d169afcad63b1ae
generic

ipv6: fix possible infinite loop in fib6_select_path() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0f7b73c3452635de83b8711b31abdda8e49aad7b

Vendor Advisories for CVE-2026-63968(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-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-24.04-edge (7.0.0-1016.16) @ 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

(3 across 3 ecosystems)
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 30× in last 7d / 161× 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 211 total refreshes for this CVE.

  1. 2026-08-30 02:54 UTCEG score recompute
  2. 2026-08-30 02:54 UTCVendor advisory
  3. 2026-08-30 02:54 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 01:43 UTCEG score recompute
  7. 2026-08-28 01:43 UTCVendor advisory
  8. 2026-08-28 01:43 UTCGHSA enrichment
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-27 11:53 UTCVendor advisory
  11. 2026-08-27 11:53 UTCGHSA enrichment
  12. 2026-08-26 22:25 UTCEG score recompute
  13. 2026-08-26 22:25 UTCVendor advisory
  14. 2026-08-26 22:25 UTCGHSA enrichment
  15. 2026-08-26 14:46 UTCEPSS rescore
  16. 2026-08-26 08:47 UTCVendor advisory
  17. 2026-08-26 08:47 UTCGHSA enrichment
  18. 2026-08-25 20:19 UTCEG score recompute
  19. 2026-08-25 20:19 UTCVendor advisory
  20. 2026-08-25 20:19 UTCGHSA enrichment
  21. 2026-08-25 13:49 UTCEPSS rescore
  22. 2026-08-25 07:36 UTCVendor advisory
  23. 2026-08-25 07:36 UTCGHSA enrichment
  24. 2026-08-24 19:09 UTCEG score recompute
  25. 2026-08-24 19:09 UTCVendor advisory
Show 75 more
  1. 2026-08-24 19:09 UTCGHSA enrichment
  2. 2026-08-24 05:31 UTCVendor advisory
  3. 2026-08-24 05:31 UTCGHSA enrichment
  4. 2026-08-23 17:06 UTCVendor advisory
  5. 2026-08-23 17:06 UTCGHSA enrichment
  6. 2026-08-23 04:42 UTCEG score recompute
  7. 2026-08-23 04:42 UTCVendor advisory
  8. 2026-08-23 04:42 UTCGHSA enrichment
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-22 16:17 UTCVendor advisory
  11. 2026-08-22 16:17 UTCGHSA enrichment
  12. 2026-08-22 03:52 UTCEG score recompute
  13. 2026-08-22 03:52 UTCVendor advisory
  14. 2026-08-22 03:52 UTCGHSA enrichment
  15. 2026-08-21 23:49 UTCEPSS rescore
  16. 2026-08-21 15:26 UTCVendor advisory
  17. 2026-08-21 15:26 UTCGHSA enrichment
  18. 2026-08-21 03:01 UTCEG score recompute
  19. 2026-08-21 03:01 UTCVendor advisory
  20. 2026-08-21 03:01 UTCGHSA enrichment
  21. 2026-08-20 22:55 UTCEPSS rescore
  22. 2026-08-20 14:36 UTCVendor advisory
  23. 2026-08-20 14:35 UTCGHSA enrichment
  24. 2026-08-20 01:01 UTCEG score recompute
  25. 2026-08-20 01:01 UTCVendor advisory
  26. 2026-08-20 01:01 UTCGHSA enrichment
  27. 2026-08-19 17:04 UTCEPSS rescore
  28. 2026-08-19 12:35 UTCVendor advisory
  29. 2026-08-19 12:35 UTCGHSA enrichment
  30. 2026-08-19 00:11 UTCEG score recompute
  31. 2026-08-19 00:11 UTCVendor advisory
  32. 2026-08-19 00:11 UTCGHSA enrichment
  33. 2026-08-18 13:48 UTCEPSS rescore
  34. 2026-08-18 11:42 UTCVendor advisory
  35. 2026-08-18 11:42 UTCGHSA enrichment
  36. 2026-08-17 23:17 UTCEG score recompute
  37. 2026-08-17 23:17 UTCVendor advisory
  38. 2026-08-17 23:17 UTCGHSA enrichment
  39. 2026-08-17 13:47 UTCEPSS rescore
  40. 2026-08-17 10:52 UTCVendor advisory
  41. 2026-08-17 10:52 UTCGHSA enrichment
  42. 2026-08-16 22:28 UTCEG score recompute
  43. 2026-08-16 22:28 UTCVendor advisory
  44. 2026-08-16 22:28 UTCGHSA enrichment
  45. 2026-08-16 14:56 UTCEPSS rescore
  46. 2026-08-16 10:03 UTCEG score recompute
  47. 2026-08-16 10:03 UTCVendor advisory
  48. 2026-08-16 10:03 UTCGHSA enrichment
  49. 2026-08-15 21:39 UTCVendor advisory
  50. 2026-08-15 21:39 UTCGHSA enrichment
  51. 2026-08-15 09:14 UTCEG score recompute
  52. 2026-08-15 09:14 UTCVendor advisory
  53. 2026-08-15 09:14 UTCGHSA enrichment
  54. 2026-08-15 01:30 UTCEPSS rescore
  55. 2026-08-14 20:49 UTCVendor advisory
  56. 2026-08-14 20:49 UTCGHSA enrichment
  57. 2026-08-14 08:25 UTCEG score recompute
  58. 2026-08-14 08:25 UTCVendor advisory
  59. 2026-08-14 08:25 UTCGHSA enrichment
  60. 2026-08-13 22:00 UTCEPSS rescore
  61. 2026-08-13 20:00 UTCVendor advisory
  62. 2026-08-13 20:00 UTCGHSA enrichment
  63. 2026-08-13 07:36 UTCVendor advisory
  64. 2026-08-13 07:36 UTCGHSA enrichment
  65. 2026-08-12 19:10 UTCEG score recompute
  66. 2026-08-12 19:10 UTCVendor advisory
  67. 2026-08-12 19:10 UTCGHSA enrichment
  68. 2026-08-12 13:51 UTCEPSS rescore
  69. 2026-08-12 06:45 UTCVendor advisory
  70. 2026-08-12 06:45 UTCGHSA enrichment
  71. 2026-08-11 18:20 UTCEG score recompute
  72. 2026-08-11 18:20 UTCVendor advisory
  73. 2026-08-11 18:20 UTCGHSA enrichment
  74. 2026-08-11 05:55 UTCEG score recompute
  75. 2026-08-11 05:55 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-63968?
CVE-2026-63968 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible infinite loop in fib6selectpath() Found while auditing the same pattern Sashiko reported in rt6fillnode() [1]. Apply the same fix as commit f8d8ce1b515a ("ipv6: fix possible infinite loop in fib6infouses_dev()").…
When was CVE-2026-63968 disclosed?
CVE-2026-63968 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-2026-63968 actively exploited?
CVE-2026-63968 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 51.1% of all scored CVEs.
What is the CVSS score of CVE-2026-63968?
CVE-2026-63968 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-63968?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63968, 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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