CVE-2026-11891

MEDIUMPre-NVD 5.15.1—
EchelonGraph scoreHIGH confidence

Score 5.1 from GitHub Security Advisory published 2026-09-08. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.1Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

Use After Free vulnerability in Arm Ltd Valhall GPU Userspace Driver, Arm Ltd Arm 5th Gen GPU Architecture Userspace Driver allows a non-privileged user process to perform valid GPU processing operations, including via WebGL or WebGPU, to access already freed memory.

This issue affects Valhall GPU Userspace Driver: from r46p0 through r49p5, from r50p0 through r54p3, r55p0; Arm 5th Gen GPU Architecture Userspace Driver: from r46p0 through r49p5, from r50p0 through r54p3, r55p0.

CVSS v3
5.1
EG Score
5.1MEDIUMhigh confidence
EG Risk
23
EG Risk 23/100CISA SSVC

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
Severity51% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 8, 2026

Last Modified

September 10, 2026

Advisory Details (1)

Auto-updated Sep 10, 2026
No patch confirmed yet.
generic

Documentation – Arm Developer

https://support.arm.com/documentation/111552/1-0/?lang=en

Vendor Advisories for CVE-2026-11891(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 63× 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.

  1. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 17:33 UTCGHSA enrichment
  3. 2026-10-03 19:13 UTCEG score recompute
  4. 2026-10-03 19:13 UTCGHSA enrichment
  5. 2026-10-03 14:25 UTCEPSS rescore
  6. 2026-10-02 20:52 UTCEG score recompute
  7. 2026-10-02 20:52 UTCGHSA enrichment
  8. 2026-10-01 22:41 UTCEG score recompute
  9. 2026-10-01 22:41 UTCGHSA enrichment
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-10-01 00:52 UTCEG score recompute
  12. 2026-10-01 00:52 UTCGHSA enrichment
  13. 2026-09-30 15:02 UTCEPSS rescore
  14. 2026-09-30 02:21 UTCGHSA enrichment
  15. 2026-09-29 00:53 UTCEG score recompute
  16. 2026-09-29 00:53 UTCGHSA enrichment
  17. 2026-09-28 13:50 UTCEPSS rescore
  18. 2026-09-28 03:04 UTCEG score recompute
  19. 2026-09-28 03:04 UTCGHSA enrichment
  20. 2026-09-27 05:14 UTCEG score recompute
  21. 2026-09-27 05:14 UTCGHSA enrichment
  22. 2026-09-26 15:58 UTCEPSS rescore
  23. 2026-09-26 06:45 UTCEG score recompute
  24. 2026-09-26 06:44 UTCGHSA enrichment
  25. 2026-09-25 08:53 UTCEG score recompute
Show 38 more
  1. 2026-09-25 08:53 UTCGHSA enrichment
  2. 2026-09-24 11:04 UTCGHSA enrichment
  3. 2026-09-23 13:15 UTCGHSA enrichment
  4. 2026-09-22 15:26 UTCEG score recompute
  5. 2026-09-22 15:26 UTCGHSA enrichment
  6. 2026-09-21 17:37 UTCGHSA enrichment
  7. 2026-09-20 19:38 UTCGHSA enrichment
  8. 2026-09-19 21:49 UTCGHSA enrichment
  9. 2026-09-18 23:59 UTCEG score recompute
  10. 2026-09-18 23:59 UTCGHSA enrichment
  11. 2026-09-18 19:27 UTCEPSS rescore
  12. 2026-09-18 02:11 UTCEG score recompute
  13. 2026-09-18 02:11 UTCGHSA enrichment
  14. 2026-09-17 04:22 UTCEG score recompute
  15. 2026-09-17 04:22 UTCGHSA enrichment
  16. 2026-09-16 06:29 UTCGHSA enrichment
  17. 2026-09-15 08:40 UTCEG score recompute
  18. 2026-09-15 08:40 UTCGHSA enrichment
  19. 2026-09-14 10:51 UTCEG score recompute
  20. 2026-09-14 10:51 UTCGHSA enrichment
  21. 2026-09-13 16:46 UTCEPSS rescore
  22. 2026-09-13 13:02 UTCGHSA enrichment
  23. 2026-09-12 15:13 UTCEG score recompute
  24. 2026-09-12 15:13 UTCGHSA enrichment
  25. 2026-09-12 15:00 UTCEPSS rescore
  26. 2026-09-11 17:24 UTCEG score recompute
  27. 2026-09-11 17:24 UTCGHSA enrichment
  28. 2026-09-11 14:52 UTCEPSS rescore
  29. 2026-09-11 09:36 UTCEPSS rescore
  30. 2026-09-10 19:21 UTCGHSA enrichment
  31. 2026-09-10 18:35 UTCEG score recompute▲ 5.10
  32. 2026-09-10 18:35 UTCGHSA enrichment
  33. 2026-09-10 18:35 UTCMITRE cvelistV5CVSS v3 → 5.1 · severity → MEDIUM
  34. 2026-09-10 09:34 UTCEPSS rescore
  35. 2026-09-08 15:32 UTCGHSA enrichment
  36. 2026-09-08 15:27 UTCNVD update
  37. 2026-09-08 14:37 UTCEG score recompute
  38. 2026-09-08 14:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-11891?
CVE-2026-11891 is a medium vulnerability published on September 8, 2026. Use After Free vulnerability in Arm Ltd Valhall GPU Userspace Driver, Arm Ltd Arm 5th Gen GPU Architecture Userspace Driver allows a non-privileged user process to perform valid GPU processing operations, including via WebGL or WebGPU, to access already freed memory. This issue affects Valhall GPU…
When was CVE-2026-11891 disclosed?
CVE-2026-11891 was first published on September 8, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11891 actively exploited?
CVE-2026-11891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-11891?
CVE-2026-11891 has a CVSS v3.1 base score of 5.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-11891?
No fix for CVE-2026-11891 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-11891 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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