CVE-2026-46065 Details
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.
A vulnerability in the Linux kernel's framebuffer device (fbdev) related to deferred I/O management has been addressed. The issue arose because the deferred I/O state was tied to the lifetime of the 'fb_info' structure. When a device was hot-unplugged, it freed the 'fb_info' instance while user space still had an active mapping of the graphics memory, leading to undefined behavior. The vulnerability allowed access to this memory, which now results in a SIGBUS signal, indicating an invalid memory access. This issue affects several versions of the Linux kernel.
Users can update to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for updating the kernel can be found in the official Linux kernel documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/25c2b77bc463f29ee71a54b883548baf9386a0db | kernel.org | Patch |
| https://git.kernel.org/stable/c/2a40f8bc9bb713329f1c35ffc199ee961a7135b0 | kernel.org | Patch |
| https://git.kernel.org/stable/c/2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4aab89603b637a2e441b38808c4f6fe7d1184df6 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4fda0d6b45faad44926dd3e4f55f118d899b2e27 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429 | kernel.org | Patch |
| https://git.kernel.org/stable/c/a0aafb421dd15e935d81543152617f2742cefa70 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-401 | Missing Release of Memory after Effective Lifetime | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 2.6.22, < 5.15.210 >= 5.16, < 6.1.176 >= 6.2, < 6.6.140 >= 6.7, < 6.12.88 >= 6.13, < 6.18.30 >= 6.19, < 7.0.4 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 24, 2026 | Initial Analysis | [email protected] |
| Jun 19, 2026 | CVE Modified | kernel.org |
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 30, 2026 | CVE Modified | kernel.org |
| May 27, 2026 | New CVE Received | kernel.org |