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Vulnerability record · CVE-2026-46065 · published 27 May 2026

CVE-2026-46065: Linux kernel memory leak vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.6% CWE-401 · Memory leak Undergoing Analysis
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
24 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/25c2b77bc463f29ee71a54b883548baf9386a0db Patch
https://git.kernel.org/stable/c/2a40f8bc9bb713329f1c35ffc199ee961a7135b0 Patch
https://git.kernel.org/stable/c/2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066 Patch
https://git.kernel.org/stable/c/4aab89603b637a2e441b38808c4f6fe7d1184df6 Patch
https://git.kernel.org/stable/c/4fda0d6b45faad44926dd3e4f55f118d899b2e27 Patch
https://git.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429 Patch
https://git.kernel.org/stable/c/a0aafb421dd15e935d81543152617f2742cefa70 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46065), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.