CVE-2026-21733: Software installed and run as a non-privileged user may conduct improper GPU system calls to gain write permis

Q: How do I fix CVE-2026-21733?

ddk: upgrade to 25.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-21733 being exploited?

CVE-2026-21733 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-21733 affect?

CVE-2026-21733 affects ddk. Severity is high (CVSS 7.3). Software installed and run as a non-privileged user may conduct improper GPU system calls to gain write permission to read-only wrapped user-mode memory and files. This is caused by improper handling of GPU memory reservation protections

Routine

HIGH 7.3UPGRADE

CVE-2026-21733 is a high-severity flaw (CVSS 7.3) affecting ddk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Software installed and run as a non-privileged user may conduct improper GPU system calls to gain write permission to read-only wrapped user-mode memory and files. This is caused by improper handling of GPU memory reservation protections.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-280, CWE-20
Published	2026-04-17
Last modified	2026-10-26

Publisher (CNA): imaginationtech · Vendor: imaginationtech

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-17 17:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

imaginationtech ddk UPGRADE

Affected: < 25.3 · 25.3 rtm

Fixed in: 25.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ddk || rpm -q ddk || ddk --version

2. UPGRADE to 25.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ddk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ddk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21733?

ddk: upgrade to 25.3. Exact commands for each OS are on this page.

Is CVE-2026-21733 being exploited?

CVE-2026-21733 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21733 affect?

CVE-2026-21733 affects ddk. Severity is high (CVSS 7.3). Software installed and run as a non-privileged user may conduct improper GPU system calls to gain write permission to read-only wrapped user-mode memory and files. This is caused by improper handling of GPU memory reservation protections

How urgent is CVE-2026-21733?

Priority 26/100. High severity

Related CVEs

CVE-2026-22167 HIGH 7.8 UPGRADE Software installed and run as a non-privileged user may conduct improper GPU system calls to force GPU to writ
CVE-2026-22166 HIGH 8.1 UPGRADE A web page that contains unusual WebGPU content loaded into the GPU GLES render process and can trigger write
CVE-2026-22165 HIGH 8.1 UPGRADE A web page that contains unusual WebGPU content loaded into the GPU GLES render process and can trigger a writ
CVE-2026-21734 HIGH 7.7 UPGRADE A web page that contains unusual GPU shader code is loaded into the GPU compiler process and can trigger a wri
CVE-2026-45195 HIGH 7.8 UPGRADE Kernel software installed and running inside a Host VM may post improper commands to the GPU Firmware to trigg

References

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