CVE-2025-38149 (GCVE-0-2025-38149)
Vulnerability from cvelistv5
Published
2025-07-03 08:35
Modified
2025-07-28 04:13
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: phy: clear phydev->devlink when the link is deleted There is a potential crash issue when disabling and re-enabling the network port. When disabling the network port, phy_detach() calls device_link_del() to remove the device link, but it does not clear phydev->devlink, so phydev->devlink is not a NULL pointer. Then the network port is re-enabled, but if phy_attach_direct() fails before calling device_link_add(), the code jumps to the "error" label and calls phy_detach(). Since phydev->devlink retains the old value from the previous attach/detach cycle, device_link_del() uses the old value, which accesses a NULL pointer and causes a crash. The simplified crash log is as follows. [ 24.702421] Call trace: [ 24.704856] device_link_put_kref+0x20/0x120 [ 24.709124] device_link_del+0x30/0x48 [ 24.712864] phy_detach+0x24/0x168 [ 24.716261] phy_attach_direct+0x168/0x3a4 [ 24.720352] phylink_fwnode_phy_connect+0xc8/0x14c [ 24.725140] phylink_of_phy_connect+0x1c/0x34 Therefore, phydev->devlink needs to be cleared when the device link is deleted.
References
Impacted products
Vendor Product Version
Linux Linux Version: bc66fa87d4fda9053a8145e5718fc278c2b88253
Version: bc66fa87d4fda9053a8145e5718fc278c2b88253
Version: bc66fa87d4fda9053a8145e5718fc278c2b88253
Version: bc66fa87d4fda9053a8145e5718fc278c2b88253
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/phy/phy_device.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "363fdf2777423ad346d781f09548cca14877f729",
              "status": "affected",
              "version": "bc66fa87d4fda9053a8145e5718fc278c2b88253",
              "versionType": "git"
            },
            {
              "lessThan": "ddc654e89ace723b78c34911c65243accbc9b75c",
              "status": "affected",
              "version": "bc66fa87d4fda9053a8145e5718fc278c2b88253",
              "versionType": "git"
            },
            {
              "lessThan": "034bc4a2a72dea2cfcaf24c6bae03c38ad5a0b87",
              "status": "affected",
              "version": "bc66fa87d4fda9053a8145e5718fc278c2b88253",
              "versionType": "git"
            },
            {
              "lessThan": "0795b05a59b1371b18ffbf09d385296b12e9f5d5",
              "status": "affected",
              "version": "bc66fa87d4fda9053a8145e5718fc278c2b88253",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/phy/phy_device.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.94",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.34",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.3",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: phy: clear phydev-\u003edevlink when the link is deleted\n\nThere is a potential crash issue when disabling and re-enabling the\nnetwork port. When disabling the network port, phy_detach() calls\ndevice_link_del() to remove the device link, but it does not clear\nphydev-\u003edevlink, so phydev-\u003edevlink is not a NULL pointer. Then the\nnetwork port is re-enabled, but if phy_attach_direct() fails before\ncalling device_link_add(), the code jumps to the \"error\" label and\ncalls phy_detach(). Since phydev-\u003edevlink retains the old value from\nthe previous attach/detach cycle, device_link_del() uses the old value,\nwhich accesses a NULL pointer and causes a crash. The simplified crash\nlog is as follows.\n\n[   24.702421] Call trace:\n[   24.704856]  device_link_put_kref+0x20/0x120\n[   24.709124]  device_link_del+0x30/0x48\n[   24.712864]  phy_detach+0x24/0x168\n[   24.716261]  phy_attach_direct+0x168/0x3a4\n[   24.720352]  phylink_fwnode_phy_connect+0xc8/0x14c\n[   24.725140]  phylink_of_phy_connect+0x1c/0x34\n\nTherefore, phydev-\u003edevlink needs to be cleared when the device link is\ndeleted."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:13:37.893Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/363fdf2777423ad346d781f09548cca14877f729"
        },
        {
          "url": "https://git.kernel.org/stable/c/ddc654e89ace723b78c34911c65243accbc9b75c"
        },
        {
          "url": "https://git.kernel.org/stable/c/034bc4a2a72dea2cfcaf24c6bae03c38ad5a0b87"
        },
        {
          "url": "https://git.kernel.org/stable/c/0795b05a59b1371b18ffbf09d385296b12e9f5d5"
        }
      ],
      "title": "net: phy: clear phydev-\u003edevlink when the link is deleted",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38149",
    "datePublished": "2025-07-03T08:35:54.405Z",
    "dateReserved": "2025-04-16T04:51:23.988Z",
    "dateUpdated": "2025-07-28T04:13:37.893Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38149\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-03T09:15:29.830\",\"lastModified\":\"2025-07-03T15:13:53.147\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: phy: clear phydev-\u003edevlink when the link is deleted\\n\\nThere is a potential crash issue when disabling and re-enabling the\\nnetwork port. When disabling the network port, phy_detach() calls\\ndevice_link_del() to remove the device link, but it does not clear\\nphydev-\u003edevlink, so phydev-\u003edevlink is not a NULL pointer. Then the\\nnetwork port is re-enabled, but if phy_attach_direct() fails before\\ncalling device_link_add(), the code jumps to the \\\"error\\\" label and\\ncalls phy_detach(). Since phydev-\u003edevlink retains the old value from\\nthe previous attach/detach cycle, device_link_del() uses the old value,\\nwhich accesses a NULL pointer and causes a crash. The simplified crash\\nlog is as follows.\\n\\n[   24.702421] Call trace:\\n[   24.704856]  device_link_put_kref+0x20/0x120\\n[   24.709124]  device_link_del+0x30/0x48\\n[   24.712864]  phy_detach+0x24/0x168\\n[   24.716261]  phy_attach_direct+0x168/0x3a4\\n[   24.720352]  phylink_fwnode_phy_connect+0xc8/0x14c\\n[   24.725140]  phylink_of_phy_connect+0x1c/0x34\\n\\nTherefore, phydev-\u003edevlink needs to be cleared when the device link is\\ndeleted.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: phy: borra phydev-\u0026gt;devlink al eliminar el enlace. Existe un posible fallo al deshabilitar y volver a habilitar el puerto de red. Al deshabilitar el puerto de red, phy_detach() llama a device_link_del() para eliminar el enlace del dispositivo, pero no borra phydev-\u0026gt;devlink, por lo que phydev-\u0026gt;devlink no es un puntero nulo. A continuaci\u00f3n, se vuelve a habilitar el puerto de red, pero si phy_attach_direct() falla antes de llamar a device_link_add(), el c\u00f3digo salta a la etiqueta \\\"error\\\" y llama a phy_detach(). Dado que phydev-\u0026gt;devlink conserva el valor anterior del ciclo de conexi\u00f3n/desconexi\u00f3n anterior, device_link_del() utiliza el valor anterior, que accede a un puntero nulo y provoca un fallo. El registro de fallos simplificado es el siguiente. [ 24.702421] Rastreo de llamadas: [ 24.704856] device_link_put_kref+0x20/0x120 [ 24.709124] device_link_del+0x30/0x48 [ 24.712864] phy_detach+0x24/0x168 [ 24.716261] phy_attach_direct+0x168/0x3a4 [ 24.720352] phylink_fwnode_phy_connect+0xc8/0x14c [ 24.725140] phylink_of_phy_connect+0x1c/0x34 Por lo tanto, phydev-\u0026gt;devlink debe borrarse cuando se elimina el enlace del dispositivo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/034bc4a2a72dea2cfcaf24c6bae03c38ad5a0b87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0795b05a59b1371b18ffbf09d385296b12e9f5d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/363fdf2777423ad346d781f09548cca14877f729\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ddc654e89ace723b78c34911c65243accbc9b75c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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