CVE-2026-80554

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-80554

Key Details

CVE	CVE-2026-80554
CVSS Score / Version	9.3 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is none; 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: Limit the number of channel program segments

The processing of channel programs, and the CCWs within them, is done

recursively. As such, there is an arbitrary (but not architectural)

limit to the number of CCWs that can exist in a single channel program.

The vfio-ccw logic breaks these channel programs into segments whenever

it encounters a Transfer-In-Channel (TIC) CCW, and the combined number

of segments count towards the global limit. Impose an equivalent limit

to the number of segments until such logic can be made non-recursive. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-80554
CVE	https://www.cve.org/CVERecord?id=CVE-2026-80554

Source

Reference

NVD

CVE