CVE-2021-47205 (GCVE-0-2021-47205)

Vulnerability from cvelistv5 – Published: 2024-04-10 18:56 – Updated: 2026-05-11 13:50
VLAI
Title
clk: sunxi-ng: Unregister clocks/resets when unbinding
Summary
In the Linux kernel, the following vulnerability has been resolved: clk: sunxi-ng: Unregister clocks/resets when unbinding Currently, unbinding a CCU driver unmaps the device's MMIO region, while leaving its clocks/resets and their providers registered. This can cause a page fault later when some clock operation tries to perform MMIO. Fix this by separating the CCU initialization from the memory allocation, and then using a devres callback to unregister the clocks and resets. This also fixes a memory leak of the `struct ccu_reset`, and uses the correct owner (the specific platform driver) for the clocks and resets. Early OF clock providers are never unregistered, and limited error handling is possible, so they are mostly unchanged. The error reporting is made more consistent by moving the message inside of_sunxi_ccu_probe.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-12 16:35 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c6a0637460c29799f1e63a6a4a65bda22caf4a54 , < b5dd513daa70ee8f6d281a20bd28485ee9bb7db2 (git)
Affected: c6a0637460c29799f1e63a6a4a65bda22caf4a54 , < 9bec2b9c6134052994115d2d3374e96f2ccb9b9d (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 5.15.5 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                "timestamp": "2024-04-12T16:35:34.459047Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-04-10T19:15:48.310",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Mailing List",
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9bec2b9c6134052994115d2d3374e96f2ccb9b9d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Mailing List",
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b5dd513daa70ee8f6d281a20bd28485ee9bb7db2"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9bec2b9c6134052994115d2d3374e96f2ccb9b9d"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b5dd513daa70ee8f6d281a20bd28485ee9bb7db2"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-401"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:46:27+00:00",
      "cve": "CVE-2021-47205",
      "id": "CVE-2021-47205",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: clk: sunxi-ng: Unregister clocks/resets when unbinding",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47205.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-13T23:56:46Z",
      "cve": "CVE-2021-47205",
      "id": "CVE-2021-47205",
      "initial_release_date": "2024-04-17T02:29:22Z",
      "product_status:known_affected": "415",
      "product_status:known_not_affected": "129",
      "product_status:recommended": "532",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47205",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47205.json",
      "version": "56"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-04T05:32:07.375Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/b5dd513daa70ee8f6d281a20bd28485ee9bb7db2"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/9bec2b9c6134052994115d2d3374e96f2ccb9b9d"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-47205",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-04-12T16:35:34.459047Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-05-23T19:01:23.553Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/clk/sunxi-ng/ccu-sun4i-a10.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-a100-r.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-a100.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-a64.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-h6.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-h616.c",
                "drivers/clk/sunxi-ng/ccu-sun5i.c",
                "drivers/clk/sunxi-ng/ccu-sun6i-a31.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-a23.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-a33.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-a83t.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-de2.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-h3.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-r.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-r40.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-v3s.c",
                "drivers/clk/sunxi-ng/ccu-sun9i-a80-de.c",
                "drivers/clk/sunxi-ng/ccu-sun9i-a80-usb.c",
                "drivers/clk/sunxi-ng/ccu-sun9i-a80.c",
                "drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c",
                "drivers/clk/sunxi-ng/ccu_common.c",
                "drivers/clk/sunxi-ng/ccu_common.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "b5dd513daa70ee8f6d281a20bd28485ee9bb7db2",
                  "status": "affected",
                  "version": "c6a0637460c29799f1e63a6a4a65bda22caf4a54",
                  "versionType": "git"
                },
                {
                  "lessThan": "9bec2b9c6134052994115d2d3374e96f2ccb9b9d",
                  "status": "affected",
                  "version": "c6a0637460c29799f1e63a6a4a65bda22caf4a54",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/clk/sunxi-ng/ccu-sun4i-a10.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-a100-r.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-a100.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-a64.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-h6.c",
                "drivers/clk/sunxi-ng/ccu-sun50i-h616.c",
                "drivers/clk/sunxi-ng/ccu-sun5i.c",
                "drivers/clk/sunxi-ng/ccu-sun6i-a31.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-a23.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-a33.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-a83t.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-de2.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-h3.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-r.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-r40.c",
                "drivers/clk/sunxi-ng/ccu-sun8i-v3s.c",
                "drivers/clk/sunxi-ng/ccu-sun9i-a80-de.c",
                "drivers/clk/sunxi-ng/ccu-sun9i-a80-usb.c",
                "drivers/clk/sunxi-ng/ccu-sun9i-a80.c",
                "drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c",
                "drivers/clk/sunxi-ng/ccu_common.c",
                "drivers/clk/sunxi-ng/ccu_common.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.10"
                },
                {
                  "lessThan": "4.10",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.16",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.5",
                      "versionStartIncluding": "4.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.16",
                      "versionStartIncluding": "4.10",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclk: sunxi-ng: Unregister clocks/resets when unbinding\n\nCurrently, unbinding a CCU driver unmaps the device\u0027s MMIO region, while\nleaving its clocks/resets and their providers registered. This can cause\na page fault later when some clock operation tries to perform MMIO. Fix\nthis by separating the CCU initialization from the memory allocation,\nand then using a devres callback to unregister the clocks and resets.\n\nThis also fixes a memory leak of the `struct ccu_reset`, and uses the\ncorrect owner (the specific platform driver) for the clocks and resets.\n\nEarly OF clock providers are never unregistered, and limited error\nhandling is possible, so they are mostly unchanged. The error reporting\nis made more consistent by moving the message inside of_sunxi_ccu_probe."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-12-18T11:36:05.325Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/b5dd513daa70ee8f6d281a20bd28485ee9bb7db2"
            },
            {
              "url": "https://git.kernel.org/stable/c/9bec2b9c6134052994115d2d3374e96f2ccb9b9d"
            }
          ],
          "title": "clk: sunxi-ng: Unregister clocks/resets when unbinding",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47205",
        "datePublished": "2024-04-10T18:56:38.347Z",
        "dateReserved": "2024-03-25T09:12:14.117Z",
        "dateUpdated": "2025-12-18T11:36:05.325Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.