CVE-2025-40120 (GCVE-0-2025-40120)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-05-11 21:43
VLAI
Title
net: usb: asix: hold PM usage ref to avoid PM/MDIO + RTNL deadlock
Summary
In the Linux kernel, the following vulnerability has been resolved: net: usb: asix: hold PM usage ref to avoid PM/MDIO + RTNL deadlock Prevent USB runtime PM (autosuspend) for AX88772* in bind. usbnet enables runtime PM (autosuspend) by default, so disabling it via the usb_driver flag is ineffective. On AX88772B, autosuspend shows no measurable power saving with current driver (no link partner, admin up/down). The ~0.453 W -> ~0.248 W drop on v6.1 comes from phylib powering the PHY off on admin-down, not from USB autosuspend. The real hazard is that with runtime PM enabled, ndo_open() (under RTNL) may synchronously trigger autoresume (usb_autopm_get_interface()) into asix_resume() while the USB PM lock is held. Resume paths then invoke phylink/phylib and MDIO, which also expect RTNL, leading to possible deadlocks or PM lock vs MDIO wake issues. To avoid this, keep the device runtime-PM active by taking a usage reference in ax88772_bind() and dropping it in unbind(). A non-zero PM usage count blocks runtime suspend regardless of userspace policy (.../power/control - pm_runtime_allow/forbid), making this approach robust against sysfs overrides. Holding a runtime-PM usage ref does not affect system-wide suspend; system sleep/resume callbacks continue to run as before.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4a2c7217cd5a87e85ceb761e307b030fe6db4805 , < 71a0ba7fdaf8d035426912a4ed7bf1738a81010c (git)
Affected: 4a2c7217cd5a87e85ceb761e307b030fe6db4805 , < 3e96cd27ff1a004d84908c1b6cc68ac60913874e (git)
Affected: 4a2c7217cd5a87e85ceb761e307b030fe6db4805 , < 724a9db84188f80ef60b1f21cc7b4e9c84e0cb64 (git)
Affected: 4a2c7217cd5a87e85ceb761e307b030fe6db4805 , < 1534517300e12f2930b6ff477b8820ff658afd11 (git)
Affected: 4a2c7217cd5a87e85ceb761e307b030fe6db4805 , < 9d8bcaf6fae1bd82bc27ec09a2694497e6f6c4b4 (git)
Affected: 4a2c7217cd5a87e85ceb761e307b030fe6db4805 , < 3d3c4cd5c62f24bb3cb4511b7a95df707635e00a (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.195 , ≤ 5.15.* (semver)
Unaffected: 6.1.156 , ≤ 6.1.* (semver)
Unaffected: 6.6.112 , ≤ 6.6.* (semver)
Unaffected: 6.12.53 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: asix: hold PM usage ref to avoid PM/MDIO + RTNL deadlock\n\nPrevent USB runtime PM (autosuspend) for AX88772* in bind.\n\nusbnet enables runtime PM (autosuspend) by default, so disabling it via\nthe usb_driver flag is ineffective. On AX88772B, autosuspend shows no\nmeasurable power saving with current driver (no link partner, admin\nup/down). The ~0.453 W -\u003e ~0.248 W drop on v6.1 comes from phylib powering\nthe PHY off on admin-down, not from USB autosuspend.\n\nThe real hazard is that with runtime PM enabled, ndo_open() (under RTNL)\nmay synchronously trigger autoresume (usb_autopm_get_interface()) into\nasix_resume() while the USB PM lock is held. Resume paths then invoke\nphylink/phylib and MDIO, which also expect RTNL, leading to possible\ndeadlocks or PM lock vs MDIO wake issues.\n\nTo avoid this, keep the device runtime-PM active by taking a usage\nreference in ax88772_bind() and dropping it in unbind(). A non-zero PM\nusage count blocks runtime suspend regardless of userspace policy\n(.../power/control - pm_runtime_allow/forbid), making this approach\nrobust against sysfs overrides.\n\nHolding a runtime-PM usage ref does not affect system-wide suspend;\nsystem sleep/resume callbacks continue to run as before."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:43:02.326Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/71a0ba7fdaf8d035426912a4ed7bf1738a81010c"
        },
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          "url": "https://git.kernel.org/stable/c/3e96cd27ff1a004d84908c1b6cc68ac60913874e"
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        {
          "url": "https://git.kernel.org/stable/c/3d3c4cd5c62f24bb3cb4511b7a95df707635e00a"
        }
      ],
      "title": "net: usb: asix: hold PM usage ref to avoid PM/MDIO + RTNL deadlock",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40120",
    "datePublished": "2025-11-12T10:23:18.726Z",
    "dateReserved": "2025-04-16T07:20:57.169Z",
    "dateUpdated": "2026-05-11T21:43:02.326Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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      "date": "2026-10-29",
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      "percentile": "0.12744"
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                "programFiles": [
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                "vendor": "Linux",
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                "vendor": "Linux",
                "versions": [
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: asix: hold PM usage ref to avoid PM/MDIO + RTNL deadlock\n\nPrevent USB runtime PM (autosuspend) for AX88772* in bind.\n\nusbnet enables runtime PM (autosuspend) by default, so disabling it via\nthe usb_driver flag is ineffective. On AX88772B, autosuspend shows no\nmeasurable power saving with current driver (no link partner, admin\nup/down). The ~0.453 W -\u003e ~0.248 W drop on v6.1 comes from phylib powering\nthe PHY off on admin-down, not from USB autosuspend.\n\nThe real hazard is that with runtime PM enabled, ndo_open() (under RTNL)\nmay synchronously trigger autoresume (usb_autopm_get_interface()) into\nasix_resume() while the USB PM lock is held. Resume paths then invoke\nphylink/phylib and MDIO, which also expect RTNL, leading to possible\ndeadlocks or PM lock vs MDIO wake issues.\n\nTo avoid this, keep the device runtime-PM active by taking a usage\nreference in ax88772_bind() and dropping it in unbind(). A non-zero PM\nusage count blocks runtime suspend regardless of userspace policy\n(.../power/control - pm_runtime_allow/forbid), making this approach\nrobust against sysfs overrides.\n\nHolding a runtime-PM usage ref does not affect system-wide suspend;\nsystem sleep/resume callbacks continue to run as before."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: usb: asix: mantener la referencia de uso de PM para evitar el interbloqueo de PM/MDIO + RTNL\n\nEvitar la gesti\u00f3n de energ\u00eda en tiempo de ejecuci\u00f3n USB (suspensi\u00f3n autom\u00e1tica) para AX88772* en la vinculaci\u00f3n.\n\nusbnet habilita la gesti\u00f3n de energ\u00eda en tiempo de ejecuci\u00f3n (suspensi\u00f3n autom\u00e1tica) por defecto, por lo que deshabilitarla a trav\u00e9s del flag usb_driver es ineficaz. En el AX88772B, la suspensi\u00f3n autom\u00e1tica no muestra un ahorro de energ\u00eda medible con el controlador actual (sin compa\u00f1ero de enlace, admin arriba/abajo). La ca\u00edda de ~0.453 W a ~0.248 W en la v6.1 proviene de phylib apagando el PHY en admin-down, no de la suspensi\u00f3n autom\u00e1tica USB.\n\nEl verdadero peligro es que, con la gesti\u00f3n de energ\u00eda en tiempo de ejecuci\u00f3n habilitada, ndo_open() (bajo RTNL) puede activar sincr\u00f3nicamente la reanudaci\u00f3n autom\u00e1tica (usb_autopm_get_interface()) en asix_resume() mientras el bloqueo de PM USB est\u00e1 mantenido. Las rutas de reanudaci\u00f3n luego invocan phylink/phylib y MDIO, que tambi\u00e9n esperan RTNL, lo que lleva a posibles interbloqueos o problemas de bloqueo de PM vs activaci\u00f3n de MDIO.\n\nPara evitar esto, se mantiene el dispositivo con la gesti\u00f3n de energ\u00eda en tiempo de ejecuci\u00f3n activa tomando una referencia de uso en ax88772_bind() y liber\u00e1ndola en unbind(). Un recuento de uso de PM distinto de cero bloquea la suspensi\u00f3n en tiempo de ejecuci\u00f3n independientemente de la pol\u00edtica del espacio de usuario (.../power/control - pm_runtime_allow/forbid), haciendo que este enfoque sea robusto contra las anulaciones de sysfs.\n\nMantener una referencia de uso de PM en tiempo de ejecuci\u00f3n no afecta la suspensi\u00f3n a nivel de sistema; las devoluciones de llamada de suspensi\u00f3n/reanudaci\u00f3n del sistema contin\u00faan ejecut\u00e1ndose como antes."
          }
        ],
        "id": "CVE-2025-40120",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-11-12T11:15:41.430",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1534517300e12f2930b6ff477b8820ff658afd11"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3d3c4cd5c62f24bb3cb4511b7a95df707635e00a"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3e96cd27ff1a004d84908c1b6cc68ac60913874e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/71a0ba7fdaf8d035426912a4ed7bf1738a81010c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/724a9db84188f80ef60b1f21cc7b4e9c84e0cb64"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9d8bcaf6fae1bd82bc27ec09a2694497e6f6c4b4"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T10:28:00+00:00",
      "cve": "CVE-2025-40120",
      "id": "CVE-2025-40120",
      "initial_release_date": "2025-11-12T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: usb: asix: hold PM usage ref to avoid PM/MDIO + RTNL deadlock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40120.json",
      "version": "3"
    }
  }
}



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