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CVE-2026-45907

Estado: En análisisMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: Fix deadlocks between devlink and netdev instance locks

In the mentioned "Fixes" commit, various work tasks triggering devlink health reporter recovery were switched to use netdev_trylock to protect against concurrent tear down of the channels being recovered. But this had the side effect of introducing potential deadlocks because of incorrect lock ordering.

The correct lock order is described by the init flow: probe_one -> mlx5_init_one (acquires devlink lock) -> mlx5_init_one_devl_locked -> mlx5_register_device -> mlx5_rescan_drivers_locked -...-> mlx5e_probe -> _mlx5e_probe -> register_netdev (acquires rtnl lock) -> register_netdevice (acquires netdev lock) => devlink lock -> rtnl lock -> netdev lock.

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But in the current recovery flow, the order is wrong: mlx5e_tx_err_cqe_work (acquires netdev lock) -> mlx5e_reporter_tx_err_cqe -> mlx5e_health_report -> devlink_health_report (acquires devlink lock => boom!) -> devlink_health_reporter_recover -> mlx5e_tx_reporter_recover -> mlx5e_tx_reporter_recover_from_ctx -> mlx5e_tx_reporter_err_cqe_recover

The same pattern exists in: mlx5e_reporter_rx_timeout mlx5e_reporter_tx_ptpsq_unhealthy mlx5e_reporter_tx_timeout

Fix these by moving the netdev_trylock calls from the work handlers lower in the call stack, in the respective recovery functions, where they are actually necessary.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-45907",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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  "affected": [
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      "affectedData": [
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          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
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              "lessThan": "4329514c61abefe4961541b128c549b017bab5ad",
              "versionType": "git"
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              "lessThan": "83ac0304a2d77519dae1e54c9713cbe1aedf19c9",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en_main.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
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          "vendor": "Linux",
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          "versions": [
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              "version": "6.16"
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            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.16",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver",
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            },
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              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en_main.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-05-27T14:17:05.233",
  "references": [
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix deadlocks between devlink and netdev instance locks\n\nIn the mentioned \"Fixes\" commit, various work tasks triggering devlink\nhealth reporter recovery were switched to use netdev_trylock to protect\nagainst concurrent tear down of the channels being recovered. But this\nhad the side effect of introducing potential deadlocks because of\nincorrect lock ordering.\n\nThe correct lock order is described by the init flow:\nprobe_one -> mlx5_init_one (acquires devlink lock)\n-> mlx5_init_one_devl_locked -> mlx5_register_device\n-> mlx5_rescan_drivers_locked -...-> mlx5e_probe -> _mlx5e_probe\n-> register_netdev (acquires rtnl lock)\n-> register_netdevice (acquires netdev lock)\n=> devlink lock -> rtnl lock -> netdev lock.\n\nBut in the current recovery flow, the order is wrong:\nmlx5e_tx_err_cqe_work (acquires netdev lock)\n-> mlx5e_reporter_tx_err_cqe -> mlx5e_health_report\n-> devlink_health_report (acquires devlink lock => boom!)\n-> devlink_health_reporter_recover\n-> mlx5e_tx_reporter_recover -> mlx5e_tx_reporter_recover_from_ctx\n-> mlx5e_tx_reporter_err_cqe_recover\n\nThe same pattern exists in:\nmlx5e_reporter_rx_timeout\nmlx5e_reporter_tx_ptpsq_unhealthy\nmlx5e_reporter_tx_timeout\n\nFix these by moving the netdev_trylock calls from the work handlers\nlower in the call stack, in the respective recovery functions, where\nthey are actually necessary."
    }
  ],
  "lastModified": "2026-06-24T16:27:56.443",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "974ECCCC-3CBB-4A66-9A34-82621077D7F4",
              "versionEndExcluding": "6.18.14",
              "versionStartIncluding": "6.16"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092",
              "versionEndExcluding": "6.19.4",
              "versionStartIncluding": "6.19"
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          ],
          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}