SB20260720342 - Improper input validation in Linux kernel scsi fcoe driver

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Main Vulnerability Database SB20260720342

SB20260720342 - Improper input validation in Linux kernel scsi fcoe driver

Published: July 20, 2026

Security Bulletin ID SB20260720342
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-63890)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in fcoe_ctlr_recv_clr_vlink() in drivers/scsi/fcoe/fcoe_ctlr.c when processing FIP CVL frames. A remote attacker can send a crafted FIP CVL frame with a zero-length non-critical descriptor to cause a denial of service.

Exploitation is limited to an unauthenticated layer 2 peer on the FCoE control VLAN and can block subsequent FIP frames on the affected controller.


Remediation

Install update from vendor's website.

References