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CVE-2026-46065

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info Hold state of deferred I/O in struct fb_deferred_io_s…

Published May 27, 2026CWE-401EPSS 0.13%

Overview

CVE-2026-46065 is a high-severity vulnerability. It was published on May 27, 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:

fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info

Hold state of deferred I/O in struct fb_deferred_io_state. Allocate an

instance as part of initializing deferred I/O and remove it only after

the final mapping has been closed. If the fb_info and the contained

deferred I/O meanwhile goes away, clear struct fb_deferred_io_state.info

to invalidate the mapping. Any access will then result in a SIGBUS

signal.

Fixes a long-standing problem, where a device hot-unplug happens while

user space still has an active mapping of the graphics memory. The hot-

unplug frees the instance of struct fb_info. Accessing the memory will

operate on undefined state.

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/25c2b77bc463f29ee71a54b883548baf9386a0dbRefgit.kernel.org/stable/c/2a40f8bc9bb713329f1c35ffc199ee961a7135b0Refgit.kernel.org/stable/c/2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066Refgit.kernel.org/stable/c/4aab89603b637a2e441b38808c4f6fe7d1184df6Refgit.kernel.org/stable/c/4fda0d6b45faad44926dd3e4f55f118d899b2e27Refgit.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429Refgit.kernel.org/stable/c/a0aafb421dd15e935d81543152617f2742cefa70

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46065?

CVE-2026-46065 is a high-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-46065?

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-2026-46065?

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-2026-46065?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46065 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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