{
  "cveId": "CVE-2026-63890",
  "url": "https://patchblox.com/security/cve/CVE-2026-63890",
  "summary": "CVE-2026-63890 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-63890, released July 20, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  scsi: fcoe: Reject FIP descriptors with zero fip...",
  "description": "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 \u003E= 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 \u003E= 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 \u003E= sizeof(*desc) stayed true forever, blocking every subsequent FIP frame on that controller.  Tighten the outer dlen guard to also reject dlen \u003C 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.",
  "published": "2026-07-19T16:17:06Z",
  "severity": "",
  "epss": 0.00226,
  "epssPercentile": 0.13322,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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  "dataAsOf": "2026-11-10T01:44:33Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}