net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery

{
  "id": "dfaf0f46f73128daf0b4700b3065499edc8d7a9c548e2f2d557de558a8dbf4d7",
  "url": "https://osv.dev/vulnerability/CVE-2026-43466",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery In case of a TX error CQE, a recovery flow is triggered, mlx5e_reset_txqsq_cc_pc() resets dma_fifo_cc to 0 but not dma_fifo_pc, desyncing the DMA FIFO producer and consumer. After recovery, the producer pushes new DMA entries at the old dma_fifo_pc, while the consumer reads from position 0. This causes us to unmap stale DMA addresses from before the recovery. The DMA FIFO is a purely software construct with no HW counterpart. At the point of reset, all WQEs have been flushed so dma_fifo_cc is already equal to dma_fifo_pc. There is no need to reset either counter, similar to how skb_fifo pc/cc are untouched. Remove the 'dma_fifo_cc = 0' reset. This fixes the following WARNING: WARNING: CPU: 0 PID: 0 at drivers/iommu/dma-iommu.c:1240 iommu_dma_unmap_page+0x79/0x90 Modules linked in: mlx5_vdpa vringh vdpa bonding mlx5_ib mlx5_vfio_pci ipip mlx5_fwctl tunnel4 mlx5_core ib_ipoib geneve ip6_gre ip_gre gre nf_tables ip6_tunnel rdma_ucm ib_uverbs ib_umad vfio_pci vfio_pci_core act_mirred act_skbedit act_vlan vhost_net vhost tap ip6table_mangle ip6table_nat ip6table_filter ip6_tables iptable_mangle cls_matchall nfnetlink_cttimeout act_gact cls_flower sch_ingress vhost_iotlb iptable_raw tunnel6 vfio_iommu_type1 vfio openvswitch nsh rpcsec_gss_krb5 auth_rpcgss oid_registry xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink iptable_nat nf_nat xt_addrtype br_n",
    "evidence": "osv:CVE-2026-43466",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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    "severity": "high",
    "structured": {
      "id": "CVE-2026-43466",
      "aliases": [
        "CVE-2026-43466"
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
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      "modified": "2026-10-28T02:30:51.610376814Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1633111d69053512d099658d4a05fc736fab36b0",
        "https://git.kernel.org/stable/c/383b37c04a4827ba60b2bafc1a6cdfd995aed58f",
        "https://git.kernel.org/stable/c/6eb68ecc5acc3b319986566c595990b8a7265b23",
        "https://git.kernel.org/stable/c/6f41f7812bfa7f991b732a4b45c5c52fc4be3b4e",
        "https://git.kernel.org/stable/c/821f85d619f7f22cda7b9d7de89cf5eeb1d11544",
        "https://git.kernel.org/stable/c/829efcccfa8f69db5dc8332961295587d218cee6",
        "https://git.kernel.org/stable/c/9c5ee9b981ee050b73fdf3f4a2464d6f1a8e10a8",
        "https://git.kernel.org/stable/c/ce1b19dd0684eeb68a124c11085bd611260b36d9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43466.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43466",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43466.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2026-43466",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520437,
  "published_at": "2026-05-08T14:22:27.513+00:00"
}