CVE-2026-64566

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-05. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 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:

xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags()

When iptfs_skb_add_frags() copies frag references from the source frag walk into a new SKB, it increments the page reference count via __skb_frag_ref() but does not propagate SKBFL_SHARED_FRAG to the destination SKB's skb_shinfo->flags.

If the source SKB carries shared frags (e.g. from a page-pool backed receive path), the new inner SKB will appear to ESP as having privately owned frags. A subsequent esp_input() call for a nested transport-mode SA then takes the no-COW fast path and decrypts in place, writing over pages that are still referenced by the outer IPTFS SKB. This causes kernel-visible memory corruption and can trigger a panic.

All other frag-transfer helpers in the kernel (skb_try_coalesce, skb_gro_receive, __pskb_copy_fclone, skb_shift, skb_segment) correctly propagate SKBFL_SHARED_FRAG; align iptfs_skb_add_frags() with this convention by setting the flag inside the loop immediately after __skb_frag_ref() and nr_frags++, so every exit path that attaches a frag unconditionally propagates SKBFL_SHARED_FRAG.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 17, 2026

Advisory Details (3)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ffd64e0717efd83fbf3396ab4e5ac6d795dac4d0
generic

xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d8aaf06b29f5a0b6186cf68d21c7d63678ee3891
generic

xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/430ea57d6daf765e88f90046afbfd1e071cb7200

Vendor Advisories for CVE-2026-64566(1)

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

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (158 versions)7.1.6-1—

Data Freshness Timeline

(refreshed 56× in last 7d / 110× 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 110 total refreshes for this CVE.

  1. 2026-08-21 05:24 UTCGHSA enrichment
  2. 2026-08-21 01:13 UTCEG score recompute
  3. 2026-08-21 01:13 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 21:03 UTCGHSA enrichment
  6. 2026-08-20 16:49 UTCGHSA enrichment
  7. 2026-08-20 12:34 UTCGHSA enrichment
  8. 2026-08-20 08:23 UTCGHSA enrichment
  9. 2026-08-20 04:13 UTCGHSA enrichment
  10. 2026-08-20 00:01 UTCGHSA enrichment
  11. 2026-08-19 19:49 UTCEG score recompute
  12. 2026-08-19 19:49 UTCGHSA enrichment
  13. 2026-08-19 17:04 UTCEPSS rescore
  14. 2026-08-19 15:38 UTCGHSA enrichment
  15. 2026-08-19 11:26 UTCGHSA enrichment
  16. 2026-08-19 07:15 UTCGHSA enrichment
  17. 2026-08-19 03:01 UTCGHSA enrichment
  18. 2026-08-18 22:26 UTCGHSA enrichment
  19. 2026-08-18 18:15 UTCEG score recompute
  20. 2026-08-18 18:15 UTCGHSA enrichment
  21. 2026-08-18 13:48 UTCEPSS rescore
  22. 2026-08-18 12:50 UTCGHSA enrichment
  23. 2026-08-18 08:39 UTCGHSA enrichment
  24. 2026-08-18 03:54 UTCGHSA enrichment
  25. 2026-08-17 23:43 UTCGHSA enrichment
Show 75 more
  1. 2026-08-17 19:32 UTCGHSA enrichment
  2. 2026-08-17 14:03 UTCEG score recompute
  3. 2026-08-17 14:03 UTCGHSA enrichment
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-17 09:52 UTCGHSA enrichment
  6. 2026-08-17 05:42 UTCEG score recompute
  7. 2026-08-17 05:42 UTCGHSA enrichment
  8. 2026-08-17 05:14 UTCEG score recompute
  9. 2026-08-17 05:14 UTCGHSA enrichment
  10. 2026-08-17 04:54 UTCGHSA enrichment
  11. 2026-08-17 00:43 UTCGHSA enrichment
  12. 2026-08-16 20:32 UTCGHSA enrichment
  13. 2026-08-16 16:21 UTCEG score recompute
  14. 2026-08-16 16:21 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 12:11 UTCGHSA enrichment
  17. 2026-08-16 08:00 UTCGHSA enrichment
  18. 2026-08-16 03:49 UTCEG score recompute
  19. 2026-08-16 03:49 UTCGHSA enrichment
  20. 2026-08-15 23:39 UTCGHSA enrichment
  21. 2026-08-15 19:28 UTCGHSA enrichment
  22. 2026-08-15 15:17 UTCGHSA enrichment
  23. 2026-08-15 11:06 UTCGHSA enrichment
  24. 2026-08-15 06:55 UTCGHSA enrichment
  25. 2026-08-15 02:06 UTCEG score recompute
  26. 2026-08-15 02:06 UTCGHSA enrichment
  27. 2026-08-15 01:30 UTCEPSS rescore
  28. 2026-08-14 21:56 UTCGHSA enrichment
  29. 2026-08-14 17:45 UTCGHSA enrichment
  30. 2026-08-14 13:34 UTCGHSA enrichment
  31. 2026-08-14 09:23 UTCGHSA enrichment
  32. 2026-08-14 05:13 UTCGHSA enrichment
  33. 2026-08-14 01:02 UTCEG score recompute
  34. 2026-08-14 01:02 UTCGHSA enrichment
  35. 2026-08-13 22:00 UTCEPSS rescore
  36. 2026-08-13 20:51 UTCGHSA enrichment
  37. 2026-08-13 16:40 UTCGHSA enrichment
  38. 2026-08-13 12:21 UTCGHSA enrichment
  39. 2026-08-13 08:10 UTCGHSA enrichment
  40. 2026-08-13 03:59 UTCGHSA enrichment
  41. 2026-08-12 23:49 UTCGHSA enrichment
  42. 2026-08-12 19:38 UTCGHSA enrichment
  43. 2026-08-12 15:28 UTCEG score recompute
  44. 2026-08-12 15:28 UTCGHSA enrichment
  45. 2026-08-12 13:51 UTCEPSS rescore
  46. 2026-08-12 11:13 UTCGHSA enrichment
  47. 2026-08-12 07:02 UTCGHSA enrichment
  48. 2026-08-12 02:51 UTCGHSA enrichment
  49. 2026-08-11 22:40 UTCGHSA enrichment
  50. 2026-08-11 18:29 UTCGHSA enrichment
  51. 2026-08-11 14:18 UTCEG score recompute
  52. 2026-08-11 14:18 UTCGHSA enrichment
  53. 2026-08-11 10:07 UTCGHSA enrichment
  54. 2026-08-11 05:57 UTCGHSA enrichment
  55. 2026-08-11 01:46 UTCEG score recompute
  56. 2026-08-11 01:46 UTCGHSA enrichment
  57. 2026-08-11 00:00 UTCEPSS rescore
  58. 2026-08-10 21:36 UTCGHSA enrichment
  59. 2026-08-10 17:25 UTCGHSA enrichment
  60. 2026-08-10 13:14 UTCGHSA enrichment
  61. 2026-08-10 09:04 UTCGHSA enrichment
  62. 2026-08-10 04:53 UTCGHSA enrichment
  63. 2026-08-10 00:43 UTCGHSA enrichment
  64. 2026-08-09 20:32 UTCGHSA enrichment
  65. 2026-08-09 16:22 UTCEG score recompute
  66. 2026-08-09 16:21 UTCGHSA enrichment
  67. 2026-08-09 13:47 UTCEPSS rescore
  68. 2026-08-09 12:11 UTCGHSA enrichment
  69. 2026-08-09 08:00 UTCGHSA enrichment
  70. 2026-08-09 03:49 UTCGHSA enrichment
  71. 2026-08-08 23:39 UTCGHSA enrichment
  72. 2026-08-08 19:28 UTCEG score recompute
  73. 2026-08-08 19:28 UTCGHSA enrichment
  74. 2026-08-08 16:37 UTCEPSS rescore
  75. 2026-08-08 15:17 UTCEG score recompute▲ 9.80

Frequently asked(5)

What is CVE-2026-64566?
CVE-2026-64566 is a critical vulnerability published on August 5, 2026. In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: propagate SKBFLSHAREDFRAG in iptfsskbadd_frags() When iptfsskbadd_frags() copies frag references from the source frag walk into a new SKB, it increments the page reference count via skbfragref() but does not propagate…
When was CVE-2026-64566 disclosed?
CVE-2026-64566 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64566 actively exploited?
CVE-2026-64566 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.6% of all scored CVEs.
What is the CVSS score of CVE-2026-64566?
CVE-2026-64566 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-64566?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64566, 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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