CVE-2026-74698 (GCVE-0-2026-74698)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-22 15:32
VLAI
Title
net/mlx5e: fix BQL reset on SQ re-activation
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6666 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b2588ea40ec9472688289c1a644627c0f4a1f33f , < 88664c48d7d1eca8e1ac92da85c89c26af741cf1 (git)
Affected: b2588ea40ec9472688289c1a644627c0f4a1f33f , < d2897717cd222e575599d903d885c48602699800 (git)
Affected: b2588ea40ec9472688289c1a644627c0f4a1f33f , < e7386770be1bf810bcd6af39d1e4bfeab3408430 (git)
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Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en_main.c"
          ],
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              "operator": "OR"
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:32:59.703Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/88664c48d7d1eca8e1ac92da85c89c26af741cf1"
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          "url": "https://git.kernel.org/stable/c/d2897717cd222e575599d903d885c48602699800"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7386770be1bf810bcd6af39d1e4bfeab3408430"
        }
      ],
      "title": "net/mlx5e: fix BQL reset on SQ re-activation",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74698",
    "datePublished": "2026-08-22T15:32:59.703Z",
    "dateReserved": "2026-08-15T05:44:03.927Z",
    "dateUpdated": "2026-08-22T15:32:59.703Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-10-16",
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      "percentile": "0.09977"
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    "nvd": {
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            "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",
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                "versions": [
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        ],
        "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",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-25T10:01:06+00:00",
      "cve": "CVE-2026-74698",
      "id": "CVE-2026-74698",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5e: fix BQL reset on SQ re-activation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74698.json",
      "version": "3"
    }
  }
}



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