CVE-2021-28664

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 5%CVSS: 8.8Exploit: cisa kev · ssvc activeExposed: 0

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

The Arm Mali GPU kernel driver allows privilege escalation or a denial of service (memory corruption) because an unprivileged user can achieve read/write access to read-only pages. This affects Bifrost r0p0 through r29p0 before r30p0, Valhall r19p0 through r29p0 before r30p0, and Midgard r8p0 through r30p0 before r31p0.

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
5%
EPSS %ILE
92%
KEV
⚠ Exploited

Published

May 10, 2021

Last Modified

November 3, 2025

Advisory Details (4)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28664
generic

Arm Product Security Center

https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driver
generic

Arm Product Security Center

https://developer.arm.com/support/arm-security-updates
generic

Arm Product Security Center

https://developer.arm.com/Arm%20Security%20Center/Mali%20GPU%20Driver%20Vulnerabilities

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 63× in last 7d / 264× 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 983 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-28664?
CVE-2021-28664 is a critical vulnerability published on May 10, 2021. The Arm Mali GPU kernel driver allows privilege escalation or a denial of service (memory corruption) because an unprivileged user can achieve read/write access to read-only pages. This affects Bifrost r0p0 through r29p0 before r30p0, Valhall r19p0 through r29p0 before r30p0, and Midgard r8p0…
When was CVE-2021-28664 disclosed?
CVE-2021-28664 was first published in the National Vulnerability Database on May 10, 2021, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-28664 actively exploited?
Yes. CISA added CVE-2021-28664 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Arm Mali Graphics Processing Unit (GPU). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-28664?
CVE-2021-28664 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-28664?
CVE-2021-28664 affects Arm Mali Graphics Processing Unit (GPU). The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-28664?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-28664, 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.

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