CVE-2026-63856

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 v2.0 enc/dec rings

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

(cherry picked from commit e2b5499fca55f1a32960a311bbb62e35891eaf73)

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 (5)

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

drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f264019be80de79f84f464846451445923bffea0
generic

drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c71aecae98e42dcf2baf462df50b3a2cf1a93fe4
generic

drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ac06ce5cac9e711281585d09d00c6efcd9b86396
generic

drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8d80b293b41fcb5e9396db93e788b0f4ebcbafb7
generic

drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5e777bc4cbe928ac0fd95e368fee1540f2ce4db2

Vendor Advisories for CVE-2026-63856(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-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-08-30ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-08-30ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-30ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-30ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-08-30ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-30ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-30ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-08-30ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-08-30ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-30ubuntu
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
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ 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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 7.2~rc5-1~exp1 (335 versions)——
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 29× in last 7d / 147× 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 197 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-63856?
CVE-2026-63856 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 v2.0 enc/dec rings 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-2026-63856 disclosed?
CVE-2026-63856 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-2026-63856 actively exploited?
CVE-2026-63856 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-2026-63856?
CVE-2026-63856 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-63856?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63856, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-63856

Explore →

Is Your Infrastructure Affected by CVE-2026-63856?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs