CVE-2026-63851

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring

VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences.

(cherry picked from commit 084d94ac93707bdda07efb5cee786f632de4219b)

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 5, 2026

Advisory Details (4)

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

drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7f23b5c420b9f68a210c29c5123bace670aa8cc9
generic

drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/75091030f07b7957cc0646cd52e2d9d15f611483
generic

drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6d9a98c5ed65ba92a09e4ca5a5f6941448145529
generic

drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/589a254bf3e88204c8402b9cbccd5e23a0af990f

Vendor Advisories for CVE-2026-63851(1)

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

Patch Availability(18)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-08-30ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-08-30ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-30ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-08-30ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.8.0-1059.62~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-30ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-30ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-30ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1061.64~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16~24.04.1) @ noble2026-08-30ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-08-30ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-08-30ubuntu

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

(2 across 2 ecosystems)
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 (137 versions)7.0.10-1—

All Vendor Advisories

(18)

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 33× in last 7d / 172× 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 219 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-63851?
CVE-2026-63851 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set nouserfence for VCN v4.0.5 enc ring VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit…
When was CVE-2026-63851 disclosed?
CVE-2026-63851 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-2026-63851 actively exploited?
CVE-2026-63851 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 96.9% of all scored CVEs.
What is the CVSS score of CVE-2026-63851?
CVE-2026-63851 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-63851?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63851, 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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