Linux Kernel signal handling Missing Release Of Memory After Effective Lifetime Rated 7.8 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-46065

Key Details

CVE	CVE-2026-46065
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel and Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classified as	CWE-401 (Missing Release of Memory after Effective Lifetime)
Exploitation prediction (EPSS)	0.13% probability of exploitation in the next 30 days (2% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel
Siemens	SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Siemens

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Subsystems	Controllers & Field I/O, OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's and Siemens's web pages for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-46065
CVE	https://www.cve.org/CVERecord?id=CVE-2026-46065

Source

Reference

NVD

CVE