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CVE-2026-89940

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: iio: buffer: Tie IIO dma fence lock lifetime to the fence The `iio_dma_fence` implementation currently uses a lock embedded in…

Published Sep 16, 2026EPSS 0.16%

Overview

CVE-2026-89940 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

iio: buffer: Tie IIO dma fence lock lifetime to the fence

The `iio_dma_fence` implementation currently uses a lock embedded in the

`iio_dmabuf_priv`. But the `iio_dma_fence` can outlive the

`iio_dmabuf_priv`, which can cause a use-after-free.

Tie the lifetime of the lock to the lifetime of the fence by embedding them

in the same struct.

We can't just hold a reference to the `iio_dmabuf_priv` from the

`iio_dma_fence` since `iio_buffer_dmabuf_release()` might sleep and the

fence release callback is not allowed to sleep.

Note that the `dma_fence` framework now has an internal lock that gets used

when the passing `NULL` for `lock` in `dma_fence_init()`, but in order to

allow this patch to be backportable use an external lock.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/510497e31be4f241103507315a859e2085ccb081Refgit.kernel.org/stable/c/6865d79fca17a80fbd60c12550ca9a5e0e20e0ebRefgit.kernel.org/stable/c/8b3e221590181a8beb3735bbabf166df02c839b5Refgit.kernel.org/stable/c/f25ec4627d935dedfb5fe83bd2c2678cdcc19611

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89940?

CVE-2026-89940 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89940?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-89940?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-89940?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89940 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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