CISA ADP Vulnrichment

Answer in brief

CVE-2021-28663 records a High severity vulnerability in CISA ADP Vulnrichment. The current sources mark it as known exploited. The current feed maps arm/bifrost_gpu_kernel_driver (generic), arm/midgard_gpu_kernel_driver (generic), n/a/n/a (generic), arm/valhall_gpu_kernel_driver (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published May 10, 2021Updated Oct 21, 2025Source checked Sep 21, 2026First seen by HOL May 24, 2026Material review Oct 21, 2025

Upstream Advisory

Key facts

Risk: High
Exploitation: Known exploited
Affected software: 4 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps arm/bifrost_gpu_kernel_driver (generic), arm/midgard_gpu_kernel_driver (generic), n/a/n/a (generic), arm/valhall_gpu_kernel_driver (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
arm/bifrost_gpu_kernel_drivergeneric	0	Not reported
arm/midgard_gpu_kernel_drivergeneric	0	Not reported
n/a/n/ageneric	n/a	Not reported
arm/valhall_gpu_kernel_drivergeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for arm/bifrost_gpu_kernel_driver, arm/midgard_gpu_kernel_driver, n/a/n/a.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
May 10, 2021
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 21, 2025
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
May 24, 2026
Added to CISA KEV
Nov 3, 2021
Evidence: source:kev:kev:kev:record

Sources and claim methodology

Upstream source description

The Arm Mali GPU kernel driver allows privilege escalation or information disclosure because GPU memory operations are mishandled, leading to a use-after-free. This affects Bifrost r0p0 through r28p0 before r29p0, Valhall r19p0 through r28p0 before r29p0, and Midgard r4p0 through r30p0.

Quoted source text, attributed separately from HOL analysis.