CVE-2021-29256

8.8 HIGH 3% exploit odds exploited in the wild Fix listed Memory safety OS & kernel

What it is

. The Arm Mali GPU kernel driver allows an unprivileged user to achieve access to freed memory, leading to information disclosure or root privilege escalation. This affects Bifrost r16p0 through r29p0 before r30p0, Valhall r19p0 through r29p0 before r30p0, and Midgard r28p0 through r30p0.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering, service disruption.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-03-26 00:00 UTC ReservedThe CVE id was reserved by its CNA
2021-05-24 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2023-07-07 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2023-07-28 Remediation deadlineCISA's due date for federal agencies to fix it
2026-06-17 03:47 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 3.0% in the next 30 days (EPSS).
Severity: 8.8 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-05-24 18:15 UTC
Last modified: 2026-06-17 03:47 UTC
Added to CISA KEV: 2023-07-07
Exploit probability: 3.0% · EPSS, next 30 days
Weakness: CWE-416 · Use after free
Record status: Analyzed

Affected

Arm Bifrost Gpu Kernel Driver < r30p0
Arm Midgard Gpu Kernel Driver < r31p0
Arm Valhall Gpu Kernel Driver < r30p0

Attack profile CVSS 3.1 · 8.8

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-29256.md and follow it. Check whether this project is affected by CVE-2021-29256. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record