CVE-2026-63889

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-63889

Key Details

CVE	CVE-2026-63889
CVSS Score / Version	8.1 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`
CVSS Prose	attack vector is adjacent; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is none; 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:

scsi: scsi_transport_fc: Widen FPIN pname walker counter to u32

An adjacent Fibre Channel fabric actor that can deliver an FPIN ELS

frame to an lpfc or qla2xxx Linux initiator can trigger a non-return in

the generic FC transport. This is not a local userspace or IP network

path; the attacker must be able to inject fabric traffic, for example as

a compromised switch or fabric controller, or as a same-zone N_Port on a

fabric that permits source spoofing.

The Link-Integrity and Peer-Congestion FPIN walkers used a u8 loop

counter against the 32-bit on-wire pname_count field, and did not bound

pname_count by the descriptor body already validated by the TLV walker.

A pname_count of 256 therefore wraps the counter and keeps the loop

condition true indefinitely.

Factor the shared pname_list[] walk into one helper, widen the counter

to u32, and clamp pname_count against the entries that fit in the

descriptor body before iterating. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-63889
CVE	https://www.cve.org/CVERecord?id=CVE-2026-63889

Source

Reference

NVD

CVE