CVE-2026-80548

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-80548

Key Details

CVE	CVE-2026-80548
CVSS Score / Version	8.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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 changed; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

s390/vfio_ccw: Selectively expand io_mutex

The io_mutex was defined to serialize the io_regions, but then has

also sort of been associated with the I/O themselves because of

the close relationship they share.

With the handful of races that are possible, the choices are either to:

A) expand the scope of io_mutex to close these remaining windows, or

B) reduce the scope of io_mutex to just io_region, and introduce a new

lock mechanism for the remaining I/O resources

This patch implements A, since B brings with it a lot more interactions

that would need to be tracked and kept in a correct hierarchy. It also

takes advantage of the workqueue element for cp_free() that now gets

called out of fsm_notoper(), which could be invoked out of an interrupt

context and thus cannot acquire a mutex itself. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-80548
CVE	https://www.cve.org/CVERecord?id=CVE-2026-80548

Source

Reference

NVD

CVE