CVE-2026-63851

HIGHPre-NVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

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
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity78% × 45%
Impact severity (EG Severity): CVSS 7.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.8): severity, escalated by confirmed exploitation. This CVE's 7.8 is its impact severity (EG Severity), not escalated.

EG Severity
7.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-19). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 19, 2026

Last Modified

October 19, 2026

Advisory Details (4)

Auto-updated Jul 21, 2026
Patch available.
Web page

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
Web page

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
Web page

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
Web page

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(21)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-10-19ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-10-19ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-10-19ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-10-19ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-10-19ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-10-19ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-10-19ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-10-19ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-10-19ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-10-19ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-10-19ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-10-19ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-10-19ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-10-19ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-10-19ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-10-19ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-10-19ubuntu
ubuntulinux-tools-azure-edge (7.0.0-1014.14~24.04.1) @ noble2026-10-19ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-10-19ubuntu
ubuntulinux-tools-oracle-edge (7.0.0-1011.11~24.04.1) @ noble2026-10-19ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-10-19ubuntu

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 rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)
  • every version up to 6.12.94-1: fixed in 6.12.94-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (141 versions)
  • every version up to 7.0.10-1: fixed in 7.0.10-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(21)

Data Freshness Timeline

(refreshed 20× in last 7d / 52× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 319 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 219 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 20:19 UTCEG score recompute
  2. 2026-10-19 20:19 UTCVendor advisory
  3. 2026-10-19 20:19 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  4. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  5. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  6. 2026-10-18 03:23 UTCEG score recompute
  7. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  8. 2026-10-16 17:20 UTCEG score recompute
  9. 2026-10-16 17:20 UTCVendor advisory
  10. 2026-10-16 17:19 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  11. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  12. 2026-10-16 15:56 UTCEG score recompute
  13. 2026-10-16 15:56 UTCVendor advisory
  14. 2026-10-16 15:55 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  15. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  16. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  17. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  18. 2026-10-13 11:50 UTCEG score recompute
  19. 2026-10-13 11:50 UTCVendor advisory
  20. 2026-10-13 11:50 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  21. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  22. 2026-10-12 15:48 UTCEG score recompute
  23. 2026-10-11 19:33 UTCEG score recompute
  24. 2026-10-11 16:48 UTCEG score recompute
  25. 2026-10-11 14:09 UTCEG score recompute
Show 75 more
  1. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  2. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  3. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  4. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  5. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  6. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  7. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  8. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  9. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  11. 2026-10-01 09:08 UTCEG score recompute
  12. 2026-10-01 09:08 UTCVendor advisory
  13. 2026-10-01 09:08 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  15. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  16. 2026-09-28 07:39 UTCEG score recompute
  17. 2026-09-28 07:39 UTCVendor advisory
  18. 2026-09-28 07:38 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  19. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  20. 2026-09-24 04:16 UTCEG score recompute
  21. 2026-09-24 04:16 UTCVendor advisory
  22. 2026-09-24 04:16 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  23. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-09-23 02:12 UTCEG score recompute
  25. 2026-09-23 02:12 UTCVendor advisory
  26. 2026-09-23 02:12 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  27. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  28. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  29. 2026-09-18 04:25 UTCEG score recompute
  30. 2026-09-18 04:25 UTCVendor advisory
  31. 2026-09-18 04:25 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  32. 2026-09-17 10:04 UTCEG score recompute
  33. 2026-09-17 10:04 UTCVendor advisory
  34. 2026-09-17 10:04 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  35. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  36. 2026-09-16 13:12 UTCEG score recompute
  37. 2026-09-16 13:11 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  38. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  39. 2026-09-14 12:24 UTCVendor advisory
  40. 2026-09-14 12:24 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  41. 2026-09-14 01:28 UTCEG score recompute
  42. 2026-09-14 01:28 UTCVendor advisory
  43. 2026-09-14 01:28 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  44. 2026-09-13 14:33 UTCVendor advisory
  45. 2026-09-13 14:33 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  46. 2026-09-13 03:38 UTCEG score recompute
  47. 2026-09-13 03:38 UTCVendor advisory
  48. 2026-09-13 03:38 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  49. 2026-09-12 07:20 UTCVendor advisory
  50. 2026-09-12 07:20 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  51. 2026-09-11 19:43 UTCEG score recompute
  52. 2026-09-11 19:43 UTCVendor advisory
  53. 2026-09-11 19:43 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  54. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  55. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  56. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  57. 2026-09-07 23:43 UTCEG score recompute
  58. 2026-09-07 23:43 UTCVendor advisory
  59. 2026-09-07 23:43 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  60. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  61. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-09-06 13:11 UTCVendor advisory
  63. 2026-09-06 13:10 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  64. 2026-09-05 20:13 UTCEG score recompute
  65. 2026-09-05 20:13 UTCVendor advisory
  66. 2026-09-05 20:13 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  67. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  68. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  69. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  70. 2026-08-31 02:39 UTCEG score recompute
  71. 2026-08-31 02:39 UTCVendor advisory
  72. 2026-08-31 02:39 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8
  73. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  74. 2026-08-30 15:42 UTCVendor advisory
  75. 2026-08-30 15:42 UTCGHSA enrichmentGHSA-jcqr-j666-39jw · GitHub severity HIGH · GitHub CVSS 7.8

Frequently asked(5)

What is CVE-2026-63851?
CVE-2026-63851 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-63851 published?
The CVE record for CVE-2026-63851 was published on July 19, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 19, 2026; the record at its source may have been updated since.
Is CVE-2026-63851 actively exploited?
CVE-2026-63851 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63851?
CVE-2026-63851 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63851?
A fix for CVE-2026-63851 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63851 are linked in the Vendor Advisories panel on this page.

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