CVE-2026-63890
Low risk· EPSS 11%Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
A vulnerability was found in the Linux kernel's FCoE driver (fcoe_ctlr.c). The FIP CVL frame handler did not validate that the descriptor length (fip_dlen) was sufficient, allowing an unauthenticated L2 attacker to send a frame with a zero-length descriptor of type FIP_DT_NON_CRITICAL. This caused an infinite loop in the work thread, blocking all subsequent FIP frames on the controller.
Risk Assessment
An attacker on the same FCoE control VLAN can perform a DoS attack on an FCoE initiator (e.g., fcoe, qedf, bnx2fc), causing permanent hang of FIP frame processing and disrupting FCoE services.
Recommendation
Immediately update the Linux kernel to a version containing the fix that rejects FIP descriptors with length less than sizeof(struct fip_desc).
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: scsi: fcoe: Reject FIP descriptors with zero fip_dlen in CVL walker drivers/scsi/fcoe/fcoe_ctlr.c::fcoe_ctlr_recv_clr_vlink() advanced the descriptor cursor by an attacker-supplied fip_dlen without ever requiring dlen >= sizeof(struct fip_desc) in the default branch. The named descriptor cases (FIP_DT_MAC, FIP_DT_NAME, FIP_DT_VN_ID) checked their per-type minimum lengths, but a FIP_DT_NON_CRITICAL descriptor (fip_dtype >= 128, which the standard requires receivers to silently ignore) skipped that check entirely. An unauthenticated L2 peer on the FCoE control VLAN could hang fcoe_ctlr_recv_work on an fcoe, qedf, or bnx2fc initiator indefinitely by emitting one FIP CVL frame whose single descriptor had fip_dtype == FIP_DT_NON_CRITICAL and fip_dlen == 0: the cursor advanced zero bytes per iteration and the loop condition rlen >= sizeof(*desc) stayed true forever, blocking every subsequent FIP frame on that controller. Tighten the outer dlen guard to also reject dlen < sizeof(struct fip_desc), so a malformed descriptor whose length cannot even cover the descriptor header is rejected before the switch. This is the same lower-bound the named cases already apply and is the minimum scope that closes the loop.