CVE-2026-90288 (GCVE-0-2026-90288)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-10-19 09:01
VLAI
Title
phy: renesas: rcar-gen2: Fix double of_node_put on phy creation failure
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.
Severity
7.4 (High)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b64b32791fb557f922beebddf74c47baf338cef0 , < 5374f3d53376d35085e0727c8c1b945bf7123996 (git)
Affected: b64b32791fb557f922beebddf74c47baf338cef0 , < b780b8929c759cfa7a892d58625a5ad46cb1cbd2 (git)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/phy/renesas/phy-rcar-gen2.c"
          ],
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          "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": [
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            "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": [
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          "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",
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    "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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      "percentile": "0.04555"
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                "programFiles": [
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          {
            "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."
          }
        ],
        "id": "CVE-2026-90288",
        "lastModified": "2026-10-19T09:19:22.473",
        "metrics": {
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                "attackVector": "LOCAL",
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                "baseScore": 7.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-17T17:17:25.860",
        "references": [
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          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "product_status:known_not_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: phy: renesas: rcar-gen2: Fix double of_node_put on phy creation failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90288.json",
      "version": "3"
    }
  }
}



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