CVE-2026-49743: Software installed and run as a non-privileged user may conduct improper GPU system calls to manipulate the li

Routine

HIGH 7.8UPGRADE

CVE-2026-49743 is a high-severity flaw (CVSS 7.8) 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 manipulate the lifetimes of synchronisation objects in the kernel, leading to read/write UAFs. During workload submission involving a fence exported by the GPU driver, the reference count of the underlying synchronisation primitive is not properly incremented. This can be exploited, by destroying the exported fence and prematurely release the underlyin

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-07-24
Last modified	2026-10-24

Publisher (CNA): imaginationtech · Vendor: imaginationtech

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-24 09:16 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

imaginationtech ddk UPGRADE

Affected: > 24.2 and < 26.1 · 24.2 rtm2 · 26.1 rtm1

Fixed in: 26.1

Safe to downgrade to: a release before 24.2

1. Check installed version

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

2. UPGRADE to 26.1 (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.

3. If no update is available yet, DOWNGRADE to a release before 24.2 (Debian / Ubuntu)

apt-cache madison ddk sudo apt install ddk=<VERSION_BEFORE_24.2> sudo apt-mark hold ddk

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ddk sudo dnf downgrade ddk-<VERSION_BEFORE_24.2> sudo dnf versionlock add ddk

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-49743?

ddk: upgrade to 26.1. Exact commands for each OS are on this page.

Is CVE-2026-49743 being exploited?

CVE-2026-49743 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-2026-49743 affect?

CVE-2026-49743 affects ddk. Severity is high (CVSS 7.8). Software installed and run as a non-privileged user may conduct improper GPU system calls to manipulate the lifetimes of synchronisation objects in the kernel, leading to read/write UAFs. During workload submission involving a fence expo

How urgent is CVE-2026-49743?

Priority 29/100. High severity

Related CVEs

CVE-2026-16280 CRITICAL 9.8 UPGRADE An integer overflow when calculating physical offsets for sparse PMRs may result in 32-bit truncation of addre
CVE-2026-49744 HIGH 7.8 UPGRADE Kernel software installed and running inside a Guest VM may post improper commands to the GPU Firmware to trig
CVE-2026-49745 HIGH 7.8 UPGRADE Kernel software installed and running inside a Guest VM may post improper commands to the GPU Firmware to trig

References

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