CVE-2026-49743: GPU DDK - Write UAF of sync checkpoint in GPU kick function after export fence file descriptor is prematurely closed

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-24 · updated 2026-10-24
Weakness: CWE-416

Description

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 underlying primitive, resulting in a potential use-after-free condition.

Affected products

Imagination Technologies Graphics DDK: from 24.2 (excl.) before 26.1; 24.2-rtm2, 26.1-rtm1 — fixed in 26.1

How to fix

Upgrade to a fixed version: Imagination Technologies Graphics DDK 26.1. Check the vendor advisory for mitigations.

References

https://www.imaginationtech.com/gpu-driver-vulnerabilities/

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