PT-2026-43932 · Linux · Linux

Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-46065

NVD

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Related Identifiers

CVE-2026-46065

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-46065 · Security Note
• https://git.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429 · Note
• https://git.kernel.org/stable/c/2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066 · Note
• https://git.kernel.org/stable/c/a0aafb421dd15e935d81543152617f2742cefa70 · Note
• https://git.kernel.org/stable/c/2a40f8bc9bb713329f1c35ffc199ee961a7135b0 · Note
• https://git.kernel.org/stable/c/25c2b77bc463f29ee71a54b883548baf9386a0db · Note