CVE-2025-39768 (GCVE-0-2025-39768)

Vulnerability from cvelistv5 – Published: 2025-09-11 16:56 – Updated: 2026-05-11 21:35
VLAI
Title
net/mlx5: HWS, fix complex rules rehash error flow
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: HWS, fix complex rules rehash error flow Moving rules from matcher to matcher should not fail. However, if it does fail due to various reasons, the error flow should allow the kernel to continue functioning (albeit with broken steering rules) instead of going into series of soft lock-ups or some other problematic behaviour. Similar to the simple rules, complex rules rehash logic suffers from the same problems. This patch fixes the error flow for moving complex rules: - If new rule creation fails before it was even enqeued, do not poll for completion - If TIMEOUT happened while moving the rule, no point trying to poll for completions for other rules. Something is broken, completion won't come, just abort the rehash sequence. - If some other completion with error received, don't give up. Continue handling rest of the rules to minimize the damage. - Make sure that the first error code that was received will be actually returned to the caller instead of replacing it with the generic error code. All the aforementioned issues stem from the same bad error flow, so no point fixing them one by one and leaving partially broken code - fixing them in one patch.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 17e0accac577fd6ea2090934d71a8c6f36702a26 , < 37d54bc28d092bc3b314da45d730f00e9d86ec2a (git)
Affected: 17e0accac577fd6ea2090934d71a8c6f36702a26 , < 4a842b1bf18a32ee0c25dd6dd98728b786a76fe4 (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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{
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            "drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc_complex.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: HWS, fix complex rules rehash error flow\n\nMoving rules from matcher to matcher should not fail.\nHowever, if it does fail due to various reasons, the error flow\nshould allow the kernel to continue functioning (albeit with broken\nsteering rules) instead of going into series of soft lock-ups or\nsome other problematic behaviour.\n\nSimilar to the simple rules, complex rules rehash logic suffers\nfrom the same problems. This patch fixes the error flow for moving\ncomplex rules:\n - If new rule creation fails before it was even enqeued, do not\n   poll for completion\n - If TIMEOUT happened while moving the rule, no point trying\n   to poll for completions for other rules. Something is broken,\n   completion won\u0027t come, just abort the rehash sequence.\n - If some other completion with error received, don\u0027t give up.\n   Continue handling rest of the rules to minimize the damage.\n - Make sure that the first error code that was received will\n   be actually returned to the caller instead of replacing it\n   with the generic error code.\n\nAll the aforementioned issues stem from the same bad error flow,\nso no point fixing them one by one and leaving partially broken\ncode - fixing them in one patch."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:35:52.915Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2025-04-16T07:20:57.127Z",
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                "vendor": "Linux",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: HWS, fix complex rules rehash error flow\n\nMoving rules from matcher to matcher should not fail.\nHowever, if it does fail due to various reasons, the error flow\nshould allow the kernel to continue functioning (albeit with broken\nsteering rules) instead of going into series of soft lock-ups or\nsome other problematic behaviour.\n\nSimilar to the simple rules, complex rules rehash logic suffers\nfrom the same problems. This patch fixes the error flow for moving\ncomplex rules:\n - If new rule creation fails before it was even enqeued, do not\n   poll for completion\n - If TIMEOUT happened while moving the rule, no point trying\n   to poll for completions for other rules. Something is broken,\n   completion won\u0027t come, just abort the rehash sequence.\n - If some other completion with error received, don\u0027t give up.\n   Continue handling rest of the rules to minimize the damage.\n - Make sure that the first error code that was received will\n   be actually returned to the caller instead of replacing it\n   with the generic error code.\n\nAll the aforementioned issues stem from the same bad error flow,\nso no point fixing them one by one and leaving partially broken\ncode - fixing them in one patch."
          },
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/mlx5: HWS, corregir el flujo de error de rehash de reglas complejas\n\nMover reglas de matcher a matcher no deber\u00eda fallar.\nSin embargo, si falla por diversas razones, el flujo de error\ndeber\u00eda permitir que el kernel siga funcionando (aunque con reglas de direccionamiento rotas)\nen lugar de entrar en una serie de soft lock-ups o\nalg\u00fan otro comportamiento problem\u00e1tico.\n\nSimilar a las reglas simples, la l\u00f3gica de rehash de reglas complejas\nsufre de los mismos problemas. Este parche corrige el flujo de error para mover\nreglas complejas:\n - Si la creaci\u00f3n de una nueva regla falla antes de que fuera siquiera encolada, no\n   sondear para la finalizaci\u00f3n.\n - Si ocurri\u00f3 un TIMEOUT mientras se mov\u00eda la regla, no tiene sentido intentar\n   sondear para finalizaciones de otras reglas. Algo est\u00e1 roto,\n   la finalizaci\u00f3n no llegar\u00e1, simplemente abortar la secuencia de rehash.\n - Si se recibi\u00f3 alguna otra finalizaci\u00f3n con error, no rendirse.\n   Continuar manejando el resto de las reglas para minimizar el da\u00f1o.\n - Asegurarse de que el primer c\u00f3digo de error que se recibi\u00f3 ser\u00e1\n   realmente devuelto al llamador en lugar de reemplazarlo\n   con el c\u00f3digo de error gen\u00e9rico.\n\nTodos los problemas antes mencionados provienen del mismo flujo de error deficiente,\nas\u00ed que no tiene sentido arreglarlos uno por uno y dejar c\u00f3digo parcialmente roto\n- arregl\u00e1ndolos en un solo parche."
          }
        ],
        "id": "CVE-2025-39768",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
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            {
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                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
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                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
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                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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              "impactScore": 3.6,
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        "references": [
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            "tags": [
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        "vulnStatus": "Analyzed",
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                "lang": "en",
                "value": "CWE-617"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:38:10+00:00",
      "cve": "CVE-2025-39768",
      "id": "CVE-2025-39768",
      "initial_release_date": "2025-09-11T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5: HWS, fix complex rules rehash error flow",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39768.json",
      "version": "3"
    }
  }
}



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