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CVE-2026-45981

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: s390/cio: Fix device lifecycle handling in css_alloc_subchannel() `css_alloc_subchannel()` calls `device_initialize()` before s…

Published May 27, 2026CWE-401EPSS 0.17%

Overview

CVE-2026-45981 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

s390/cio: Fix device lifecycle handling in css_alloc_subchannel()

`css_alloc_subchannel()` calls `device_initialize()` before setting up

the DMA masks. If `dma_set_coherent_mask()` or `dma_set_mask()` fails,

the error path frees the subchannel structure directly, bypassing

the device model reference counting.

Once `device_initialize()` has been called, the embedded struct device

must be released via `put_device()`, allowing the release callback to

free the container structure.

Fix the error path by dropping the initial device reference with

`put_device()` instead of calling `kfree()` directly.

This ensures correct device lifetime handling and avoids potential

use-after-free or double-free issues.

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/6715560527e343a387e4a0d2e6c401748e89fa55Refgit.kernel.org/stable/c/abb6e07f46a740cda4f07d1b561ae4eaa7a1df42Refgit.kernel.org/stable/c/c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603Refgit.kernel.org/stable/c/f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7Refgit.kernel.org/stable/c/f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45981?

CVE-2026-45981 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-45981?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-45981?

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-2026-45981?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45981 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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