FKIE_CVE-2026-74698

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: fix BQL reset on SQ re-activation mlx5e_queue_start() deactivates and re-activates all channels but closes only the queue being restarted. mlx5e_activate_txqsq() then unconditionally calls netdev_tx_reset_queue(), zeroing the BQL counters of channels that kept their in-flight TX WQEs. The next completion then over-charges and trips the BUG_ON() in dql_completed(): kernel BUG at lib/dynamic_queue_limits.c:99! RIP: 0010:dql_completed+0x23d/0x280 Call Trace: <IRQ> mlx5e_poll_tx_cq+0x668/0xa60 mlx5e_napi_poll+0x5b/0x7b0 net_rx_action+0x15a/0x580 Reset BQL only when the SQ has no bytes in flight (sq->cc == sq->pc). In the case that reset is skipped, the outstanding WQEs will eventually complete and rebalance the dql. The dql->limit is carried across the reset.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/88664c48d7d1eca8e1ac92da85c89c26af741cf1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2897717cd222e575599d903d885c48602699800
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e7386770be1bf810bcd6af39d1e4bfeab3408430
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "88664c48d7d1eca8e1ac92da85c89c26af741cf1",
              "status": "affected",
              "version": "b2588ea40ec9472688289c1a644627c0f4a1f33f",
              "versionType": "git"
            },
            {
              "lessThan": "d2897717cd222e575599d903d885c48602699800",
              "status": "affected",
              "version": "b2588ea40ec9472688289c1a644627c0f4a1f33f",
              "versionType": "git"
            },
            {
              "lessThan": "e7386770be1bf810bcd6af39d1e4bfeab3408430",
              "status": "affected",
              "version": "b2588ea40ec9472688289c1a644627c0f4a1f33f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: fix BQL reset on SQ re-activation\n\nmlx5e_queue_start() deactivates and re-activates all channels but closes\nonly the queue being restarted. mlx5e_activate_txqsq() then\nunconditionally calls netdev_tx_reset_queue(), zeroing the BQL counters\nof channels that kept their in-flight TX WQEs. The next completion then\nover-charges and trips the BUG_ON() in dql_completed():\n\n  kernel BUG at lib/dynamic_queue_limits.c:99!\n  RIP: 0010:dql_completed+0x23d/0x280\n  Call Trace:\n   \u003cIRQ\u003e\n   mlx5e_poll_tx_cq+0x668/0xa60\n   mlx5e_napi_poll+0x5b/0x7b0\n   net_rx_action+0x15a/0x580\n\nReset BQL only when the SQ has no bytes in flight (sq-\u003ecc == sq-\u003epc).\n\nIn the case that reset is skipped, the outstanding WQEs will eventually\ncomplete and rebalance the dql. The dql-\u003elimit is carried across the\nreset."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/mlx5e: corrige el reinicio de BQL en la reactivaci\u00f3n de SQ\n\nmlx5e_queue_start() desactiva y reactiva todos los canales, pero cierra solo la cola que se est\u00e1 reiniciando. mlx5e_activate_txqsq() luego llama incondicionalmente a netdev_tx_reset_queue(), poniendo a cero los contadores BQL de los canales que mantuvieron sus WQE TX en vuelo. La siguiente finalizaci\u00f3n luego sobrecarga y activa el BUG_ON() en dql_completed():\n\nBUG del kernel en lib/dynamic_queue_limits.c:99!\nRIP: 0010:dql_completed+0x23d/0x280\nTraza de Llamadas:\n \u003cIRQ\u003e\n mlx5e_poll_tx_cq+0x668/0xa60\n mlx5e_napi_poll+0x5b/0x7b0\n net_rx_action+0x15a/0x580\n\nReinicia BQL solo cuando el SQ no tiene bytes en vuelo (sq -\u003e cc == sq -\u003e pc).\n\nEn el caso de que se omita el reinicio, los WQE pendientes finalmente se completar\u00e1n y reequilibrar\u00e1n el dql. El dql -\u003e limit se mantiene a trav\u00e9s del reinicio."
    }
  ],
  "id": "CVE-2026-74698",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {},
  "published": "2026-08-22T16:16:44.397",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/88664c48d7d1eca8e1ac92da85c89c26af741cf1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d2897717cd222e575599d903d885c48602699800"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e7386770be1bf810bcd6af39d1e4bfeab3408430"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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