CVE-2026-90288 (GCVE-0-2026-90288)
Vulnerability from cvelistv5
Published
2026-09-17 16:08
Modified
2026-10-19 09:01
Severity ?
7.4 (High) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: phy: renesas: rcar-gen2: Fix double of_node_put on phy creation failure for_each_child_of_node_scoped() releases the node reference on scope exit, so the explicit of_node_put(np) in the devm_phy_create() error path drops it twice. Drop the redundant of_node_put() and let the scoped cleanup handle it.
References
Impacted products
Vendor Product Version
Linux Linux Version: b64b32791fb557f922beebddf74c47baf338cef0
Version: b64b32791fb557f922beebddf74c47baf338cef0
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/phy/renesas/phy-rcar-gen2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5374f3d53376d35085e0727c8c1b945bf7123996",
              "status": "affected",
              "version": "b64b32791fb557f922beebddf74c47baf338cef0",
              "versionType": "git"
            },
            {
              "lessThan": "b780b8929c759cfa7a892d58625a5ad46cb1cbd2",
              "status": "affected",
              "version": "b64b32791fb557f922beebddf74c47baf338cef0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/phy/renesas/phy-rcar-gen2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nphy: renesas: rcar-gen2: Fix double of_node_put on phy creation failure\n\nfor_each_child_of_node_scoped() releases the node reference on scope\nexit, so the explicit of_node_put(np) in the devm_phy_create() error\npath drops it twice.\n\nDrop the redundant of_node_put() and let the scoped cleanup handle it."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The extra of_node_put(np) runs only in rcar_gen2_phy_probe() after a failed devm_phy_create() on a usb-phy@0/@2 child, reached via platform_probe() when the renesas,rcar-gen2-usb-phy device (usb-phy-controller@e6590100) is bound from DT; USB transfers and network packets never enter this probe.\nAC:H - The double put runs only when phy_create() fails inside rcar_gen2_phy_probe() (kzalloc/ida_alloc/devres_alloc ENOMEM, regulator_get_optional(\"phy\") -EPROBE_DEFER, or device_add failure). Those GFP_KERNEL/sysfs failures are not attacker-controlled, and of_node_put() is a no-op unless CONFIG_OF_DYNAMIC is enabled.\nPR:N - rcar_gen2_phy_probe() has no capable() check; with PHY_RCAR_GEN2=y (shmobile_defconfig) platform_probe() binds usb-phy-controller@e6590100 during kernel init on boards that set \u0026usbphy { status = \"okay\" }, so the failed-create path needs no user account. Sysfs bind is 0200 root-only but is not required for that boot path.\nUI:N - Lager, Koelsch, Porter, Silk, and iwg23s-sbc enable \u0026usbphy/\u0026usbphy0 in DT, so of_platform populate plus platform_probe() run rcar_gen2_phy_probe() unattended at boot; no mount, open, or USB plug-in is required to hit the devm_phy_create() error path.\nS:U - kobject_cleanup() of the still-attached usb-phy@0 device_node and the extra put on its parent usb-phy-controller node occur in host kernel OF/kobject code; this is not a KVM/Xen escape or IOMMU/DMA bypass.\nC:H - When the second of_node_put(np) drops the usb-phy@0 kobject to zero, kobject_cleanup() kfree_const()s kobj-\u003ename while the node stays in the OF tree and rcar_gen2_phy_xlate() still compares args-\u003enp to channel-\u003eof_node; later kobject_name() reads reclaimed heap, and of_node_release()\u0027s dump_stack() leaks kernel pointers.\nI:H - kobject_cleanup() also __kobject_del()s the live usb-phy@0 sysfs dir and kobject_put()s the parent controller node, leaving a released kobject with a dangling name pointer still linked via channel-\u003eof_node; reclaiming that name slab plus later kobject_get/put on the zero-ref kobject provides write and control-flow primitives.\nA:H - of_node_release() prints \"detected bad of_node_put()\" and dump_stack() for the still-attached usb-phy@0 node; the next of_node_get/put hits refcount_t underflow/UAF (panic under panic_on_warn), and tearing down /sys/firmware/devicetree for a node still used by rcar_gen2_phy_xlate() can oops."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:01:06.628Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5374f3d53376d35085e0727c8c1b945bf7123996"
        },
        {
          "url": "https://git.kernel.org/stable/c/b780b8929c759cfa7a892d58625a5ad46cb1cbd2"
        }
      ],
      "title": "phy: renesas: rcar-gen2: Fix double of_node_put on phy creation failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90288",
    "datePublished": "2026-09-17T16:08:16.686Z",
    "dateReserved": "2026-09-11T19:38:34.798Z",
    "dateUpdated": "2026-10-19T09:01:06.628Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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