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
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en_main.c"
          ],
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      "cpeApplicability": [
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                  "versionStartIncluding": "6.17",
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                },
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                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:32:59.703Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/88664c48d7d1eca8e1ac92da85c89c26af741cf1"
        },
        {
          "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",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74698",
      "date": "2026-09-01",
      "epss": "0.00166",
      "percentile": "0.06108"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74698\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:44.397\",\"lastModified\":\"2026-08-22T16:16:44.397\",\"vulnStatus\":\"Received\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/mellanox/mlx5/core/en_main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b2588ea40ec9472688289c1a644627c0f4a1f33f\",\"lessThan\":\"88664c48d7d1eca8e1ac92da85c89c26af741cf1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b2588ea40ec9472688289c1a644627c0f4a1f33f\",\"lessThan\":\"d2897717cd222e575599d903d885c48602699800\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b2588ea40ec9472688289c1a644627c0f4a1f33f\",\"lessThan\":\"e7386770be1bf810bcd6af39d1e4bfeab3408430\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/mellanox/mlx5/core/en_main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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