CVE-2025-38149 (GCVE-0-2025-38149)

Vulnerability from cvelistv5 – Published: 2025-07-03 08:35 – Updated: 2026-11-05 20:52
VLAI
Title
net: phy: clear phydev->devlink when the link is deleted
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 20:50 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bc66fa87d4fda9053a8145e5718fc278c2b88253 , < 363fdf2777423ad346d781f09548cca14877f729 (git)
Affected: bc66fa87d4fda9053a8145e5718fc278c2b88253 , < ddc654e89ace723b78c34911c65243accbc9b75c (git)
Affected: bc66fa87d4fda9053a8145e5718fc278c2b88253 , < 034bc4a2a72dea2cfcaf24c6bae03c38ad5a0b87 (git)
Affected: bc66fa87d4fda9053a8145e5718fc278c2b88253 , < 0795b05a59b1371b18ffbf09d385296b12e9f5d5 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.94 , ≤ 6.6.* (semver)
Unaffected: 6.12.34 , ≤ 6.12.* (semver)
Unaffected: 6.15.3 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "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."
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            "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."
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                {
                  "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": "2026-05-11T21:22:12.534Z",
            "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": "2026-11-05T20:52:17.920Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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