CVE-2026-63912

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-19. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 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: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

xfrm: esp: restore combined single-frag length gate

The ESP out-of-place fast path appends the trailer in esp_output_head() before esp_output_tail() allocates the destination page frag. The head-side gate currently checks skb->data_len and tailen separately, but the tail code allocates a single destination frag from the combined post-trailer skb->data_len.

Reject the page-frag fast path when the combined aligned length exceeds a page. Otherwise skb_page_frag_refill() may fall back to a single page while the destination sg still spans the combined skb->data_len.

Restore this combined-length page gate for both IPv4 and IPv6.

CVSS v3
9.8
EG Score
9.8(medium)
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%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 26, 2026
No patch confirmed yet.
generic

xfrm: esp: restore combined single-frag length gate - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40
generic

xfrm: esp: restore combined single-frag length gate - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095
generic

xfrm: esp: restore combined single-frag length gate - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59
generic

xfrm: esp: restore combined single-frag length gate - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba
generic

xfrm: esp: restore combined single-frag length gate - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec
generic

xfrm: esp: restore combined single-frag length gate - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708
generic

xfrm: esp: restore combined single-frag length gate - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c
generic

xfrm: esp: restore combined single-frag length gate - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e

Vendor Advisories for CVE-2026-63912(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-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16~24.04.1) @ noble2026-08-30ubuntu
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-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 64× in last 7d / 383× 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 460 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-63912?
CVE-2026-63912 is a critical vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: restore combined single-frag length gate The ESP out-of-place fast path appends the trailer in espoutputhead() before espoutputtail() allocates the destination page frag. The head-side gate currently checks skb->data_len…
When was CVE-2026-63912 disclosed?
CVE-2026-63912 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-2026-63912 actively exploited?
CVE-2026-63912 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 49.3% of all scored CVEs.
What is the CVSS score of CVE-2026-63912?
CVE-2026-63912 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-63912?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63912, 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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