Security readout for executives and security teams
Plain-English summary
CVE-2021-28663 is a high-severity flaw in the Arm Mali GPU kernel driver. A local attacker with some privileges could abuse mishandled GPU memory to gain higher privileges or expose sensitive information. Because CISA lists it as known exploited, affected systems should be treated as operationally urgent.
Executive priority
Treat this as a high-priority remediation item because it combines high impact with CISA-confirmed known exploitation. The main business risk is local privilege escalation on devices carrying vulnerable Mali GPU drivers, especially where patch visibility depends on OEM firmware updates.
Technical view
The issue is a use-after-free in Mali GPU kernel-driver memory operations. The source bundle lists Bifrost r0p0-r28p0 before r29p0, Valhall r19p0-r28p0 before r29p0, and Midgard r4p0-r30p0 as affected. CVSS 3.1 is 8.8 with low complexity, low privileges, no user interaction, and high CIA impact.
Likely exposure
Exposure exists where deployed systems include affected Arm Mali GPU kernel driver versions. Inventory should focus on kernel driver release levels, OEM firmware provenance, and devices using affected Bifrost, Valhall, or Midgard driver branches.
Exploitation context
Active exploitation is supported by the CISA Known Exploited Vulnerabilities listing. The bundle also includes a public GitHub reference, but this analysis does not rely on or describe exploit mechanics. Sources do not establish which organizations, sectors, or products were targeted.
Researcher notes
Evidence supports CWE-416 use-after-free, kernel-driver memory mishandling, and KEV status. The bundle does not provide affected CPEs, product SKUs, exploit campaign details, or a named Midgard fixed version, so validation should rely on Arm and OEM driver mapping.
Mitigation direction
- Apply the relevant Arm or OEM security update for the Mali GPU kernel driver.
- Prioritize internet-managed or high-value devices with affected driver branches.
- Check vendor firmware guidance where driver version mapping is unclear.
- Retire or isolate systems that cannot receive a corrected driver.
- Track this CVE under KEV remediation governance.
Validation and detection
- Inventory systems for Mali GPU kernel driver branch and release identifiers.
- Confirm Bifrost and Valhall deployments are at r29p0 or later where applicable.
- Review OEM advisories for Midgard remediation status and firmware availability.
- Verify installed firmware includes the corrected Mali driver package.
- Monitor endpoint and kernel telemetry for abnormal GPU driver behavior.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-28663 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://developer.arm.com/support/arm-security-updatesCVE reference
- https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driverCVE reference
- https://github.com/lntrx/CVE-2021-28663CVE reference
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28663CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.