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A vulnerability in the Linux kernel's SCSI FCoE driver was resolved that allowed an unauthenticated Layer 2 peer on the FCoE control VLAN to cause a denial of service. The flaw involved improper handling of FIP descriptors with zero length, which could cause an infinite loop and hang the controller. This issue affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. A patch is available and included in recent Linux kernel updates distributed by Ubuntu.

The vulnerability (CVE-2026-63890) exists in the Linux kernel's scsi/fcoe driver, specifically in the function fcoe_ctlr_recv_clr_vlink(). The function advanced a descriptor cursor by an attacker-supplied length (fip_dlen) without validating that the length was at least the size of a descriptor. While some descriptor types checked minimum lengths, the FIP_DT_NON_CRITICAL descriptor type (which receivers must silently ignore) skipped this check. An attacker on the FCoE control VLAN could send a FIP CVL frame with a single descriptor of type FIP_DT_NON_CRITICAL and zero length, causing the cursor to not advance and the loop to run indefinitely. This results in the fcoe_ctlr_recv_work thread hanging indefinitely, blocking all subsequent FIP frames on that controller and causing a denial of service. The issue affects multiple Linux kernel versions prior to 7.0.0-28.28 and related versions. Ubuntu has released patches addressing this vulnerability in their Linux kernel packages.

Detailed information about In the Linux kernel, the following vulnerability has been resolved: scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walk

In the Linux kernel, the following vulnerability has been resolved: scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker… (CVE-2026-63890) - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker… (CVE-2026-63890)

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