CVE-2026-90126 (GCVE-0-2026-90126)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-10-19 08:58
VLAI
Title
rtc: pcf8563: fix clock provider leak on unbind
Summary
In the Linux kernel, the following vulnerability has been resolved: rtc: pcf8563: fix clock provider leak on unbind pcf8563_clkout_register_clk() registers the CLKOUT clock provider with of_clk_add_provider(), but nothing ever unwinds it: there is no of_clk_del_provider() call and the driver has no remove callback. Each of_clk_add_provider() allocates a struct of_clk_provider, takes a reference on the OF node and adds an entry to the global of_clk_providers list, none of which is released when the device is unbound. Every bind/unbind (or module reload) therefore leaks a provider structure and an of_node reference. The clock itself is already device-managed (devm_clk_register()); only the provider registration was not. Use devm_of_clk_add_hw_provider() so the provider is removed automatically on unbind. Tie it to the parent i2c device, whose OF node carries the #clock-cells and clock-output-names properties (the RTC class device has no OF node of its own).
Severity
No CVSS data available.
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: a39a6405d5f949bc651694028a55d74c514ef1f9 , < 2b5622cf4ee218b6f98d31dbf3fbd44b9b6bd675 (git)
Affected: a39a6405d5f949bc651694028a55d74c514ef1f9 , < 36cb00c33bd83e7ce31b5a9f1f7c70db0cb7776c (git)
Affected: a39a6405d5f949bc651694028a55d74c514ef1f9 , < 30b7c63af50fe1464e7582a37de1ca4bd030ecc1 (git)
Affected: a39a6405d5f949bc651694028a55d74c514ef1f9 , < 7afb8db47c4f107bce89cfe5115fb31ba7c94665 (git)
Affected: a39a6405d5f949bc651694028a55d74c514ef1f9 , < 97edf3fd9a46ea89a167966991c0449cfa07b36f (git)
Affected: a39a6405d5f949bc651694028a55d74c514ef1f9 , < 08a59c28c2bdbcd655e99526c86a41dc83834283 (git)
Affected: a39a6405d5f949bc651694028a55d74c514ef1f9 , < 6218c0533a72235ec9c5f41b812c63d963bd4a3e (git)
Affected: a39a6405d5f949bc651694028a55d74c514ef1f9 , < 9c48a53685040bb0de45a640b34055cbbfc69d4f (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.4
Unaffected: 0 , < 4.4 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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                  "versionStartIncluding": "4.4",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrtc: pcf8563: fix clock provider leak on unbind\n\npcf8563_clkout_register_clk() registers the CLKOUT clock provider with\nof_clk_add_provider(), but nothing ever unwinds it: there is no\nof_clk_del_provider() call and the driver has no remove callback. Each\nof_clk_add_provider() allocates a struct of_clk_provider, takes a\nreference on the OF node and adds an entry to the global of_clk_providers\nlist, none of which is released when the device is unbound. Every\nbind/unbind (or module reload) therefore leaks a provider structure and\nan of_node reference.\n\nThe clock itself is already device-managed (devm_clk_register()); only\nthe provider registration was not. Use devm_of_clk_add_hw_provider() so\nthe provider is removed automatically on unbind. Tie it to the parent\ni2c device, whose OF node carries the #clock-cells and clock-output-names\nproperties (the RTC class device has no OF node of its own)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:58:24.498Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2b5622cf4ee218b6f98d31dbf3fbd44b9b6bd675"
        },
        {
          "url": "https://git.kernel.org/stable/c/36cb00c33bd83e7ce31b5a9f1f7c70db0cb7776c"
        },
        {
          "url": "https://git.kernel.org/stable/c/30b7c63af50fe1464e7582a37de1ca4bd030ecc1"
        },
        {
          "url": "https://git.kernel.org/stable/c/7afb8db47c4f107bce89cfe5115fb31ba7c94665"
        },
        {
          "url": "https://git.kernel.org/stable/c/97edf3fd9a46ea89a167966991c0449cfa07b36f"
        },
        {
          "url": "https://git.kernel.org/stable/c/08a59c28c2bdbcd655e99526c86a41dc83834283"
        },
        {
          "url": "https://git.kernel.org/stable/c/6218c0533a72235ec9c5f41b812c63d963bd4a3e"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c48a53685040bb0de45a640b34055cbbfc69d4f"
        }
      ],
      "title": "rtc: pcf8563: fix clock provider leak on unbind",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90126",
    "datePublished": "2026-09-17T16:06:28.568Z",
    "dateReserved": "2026-09-11T19:38:34.788Z",
    "dateUpdated": "2026-10-19T08:58:24.498Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "cve": "CVE-2026-90126",
      "date": "2026-11-09",
      "epss": "0.00216",
      "percentile": "0.12125"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-90126",
      "id": "msrc_CVE-2026-90126",
      "initial_release_date": "2026-09-19T01:06:45.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "rtc: pcf8563: fix clock provider leak on unbind",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90126.json",
      "version": "6"
    },
    "nvd": {
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrtc: pcf8563: fix clock provider leak on unbind\n\npcf8563_clkout_register_clk() registers the CLKOUT clock provider with\nof_clk_add_provider(), but nothing ever unwinds it: there is no\nof_clk_del_provider() call and the driver has no remove callback. Each\nof_clk_add_provider() allocates a struct of_clk_provider, takes a\nreference on the OF node and adds an entry to the global of_clk_providers\nlist, none of which is released when the device is unbound. Every\nbind/unbind (or module reload) therefore leaks a provider structure and\nan of_node reference.\n\nThe clock itself is already device-managed (devm_clk_register()); only\nthe provider registration was not. Use devm_of_clk_add_hw_provider() so\nthe provider is removed automatically on unbind. Tie it to the parent\ni2c device, whose OF node carries the #clock-cells and clock-output-names\nproperties (the RTC class device has no OF node of its own)."
          }
        ],
        "id": "CVE-2026-90126",
        "lastModified": "2026-10-19T09:19:02.217",
        "metrics": {},
        "published": "2026-09-17T17:17:04.937",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/08a59c28c2bdbcd655e99526c86a41dc83834283"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          {
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          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7afb8db47c4f107bce89cfe5115fb31ba7c94665"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9c48a53685040bb0de45a640b34055cbbfc69d4f"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-11-06T19:52:45+00:00",
      "cve": "CVE-2026-90126",
      "id": "CVE-2026-90126",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "160",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rtc: pcf8563: fix clock provider leak on unbind",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90126.json",
      "version": "3"
    }
  }
}



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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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