CVE-2025-38282 (GCVE-0-2025-38282)

Vulnerability from cvelistv5 – Published: 2025-07-10 07:42 – Updated: 2026-11-05 21:02
VLAI
Title
kernfs: Relax constraint in draining guard
Summary
In the Linux kernel, the following vulnerability has been resolved: kernfs: Relax constraint in draining guard The active reference lifecycle provides the break/unbreak mechanism but the active reference is not truly active after unbreak -- callers don't use it afterwards but it's important for proper pairing of kn->active counting. Assuming this mechanism is in place, the WARN check in kernfs_should_drain_open_files() is too sensitive -- it may transiently catch those (rightful) callers between kernfs_unbreak_active_protection() and kernfs_put_active() as found out by Chen Ridong: kernfs_remove_by_name_ns kernfs_get_active // active=1 __kernfs_remove // active=0x80000002 kernfs_drain ... wait_event //waiting (active == 0x80000001) kernfs_break_active_protection // active = 0x80000001 // continue kernfs_unbreak_active_protection // active = 0x80000002 ... kernfs_should_drain_open_files // warning occurs kernfs_put_active To avoid the false positives (mind panic_on_warn) remove the check altogether. (This is meant as quick fix, I think active reference break/unbreak may be simplified with larger rework.)
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 20:53 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: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 2d6a67c2b3b87808a347dc1047b520a9dd177a4f (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 6c81f1c7812c61f187bed1b938f1d2e391d503ab (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 6bfb154f95d5f0ab7ed056f23aba8c1a94cb3927 (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 72275c888f8962b406ee9c6885c79bf68cca5a63 (git)
Affected: bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 , < 071d8e4c2a3b0999a9b822e2eb8854784a350f8a (git)
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Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.142 , ≤ 6.1.* (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)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkernfs: Relax constraint in draining guard\n\nThe active reference lifecycle provides the break/unbreak mechanism but\nthe active reference is not truly active after unbreak -- callers don\u0027t\nuse it afterwards but it\u0027s important for proper pairing of kn-\u003eactive\ncounting. Assuming this mechanism is in place, the WARN check in\nkernfs_should_drain_open_files() is too sensitive -- it may transiently\ncatch those (rightful) callers between\nkernfs_unbreak_active_protection() and kernfs_put_active() as found out by Chen\nRidong:\n\n\tkernfs_remove_by_name_ns\tkernfs_get_active // active=1\n\t__kernfs_remove\t\t\t\t\t  // active=0x80000002\n\tkernfs_drain\t\t\t...\n\twait_event\n\t//waiting (active == 0x80000001)\n\t\t\t\t\tkernfs_break_active_protection\n\t\t\t\t\t// active = 0x80000001\n\t// continue\n\t\t\t\t\tkernfs_unbreak_active_protection\n\t\t\t\t\t// active = 0x80000002\n\t...\n\tkernfs_should_drain_open_files\n\t// warning occurs\n\t\t\t\t\tkernfs_put_active\n\nTo avoid the false positives (mind panic_on_warn) remove the check altogether.\n(This is meant as quick fix, I think active reference break/unbreak may be\nsimplified with larger rework.)"
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: kernfs: relajar restricci\u00f3n en el drenaje de la protecci\u00f3n El ciclo de vida de la referencia activa proporciona el mecanismo de interrupci\u00f3n/desconexi\u00f3n, pero la referencia activa no est\u00e1 verdaderamente activa despu\u00e9s de la conexi\u00f3n; los llamadores no la usan despu\u00e9s, pero es importante para el emparejamiento adecuado del conteo kn-\u0026gt;activo. Suponiendo que este mecanismo est\u00e1 en su lugar, la comprobaci\u00f3n WARN en kernfs_should_drain_open_files() es demasiado sensible - puede atrapar transitoriamente a aquellos llamadores (leg\u00edtimos) entre kernfs_unbreak_active_protection() y kernfs_put_active() como descubri\u00f3 Chen Ridong: kernfs_remove_by_name_ns kernfs_get_active // active=1 __kernfs_remove // active=0x80000002 kernfs_drain ... wait_event //waiting (active == 0x80000001) kernfs_break_active_protection // active = 0x80000001 // continuar kernfs_unbreak_active_protection // active = 0x80000002 ... kernfs_should_drain_open_files // ocurre una advertencia kernfs_put_active Para evitar los falsos positivos (tenga en cuenta \"panic_on_warn\"), elimine la comprobaci\u00f3n por completo. (Esto es una soluci\u00f3n r\u00e1pida; creo que la interrupci\u00f3n/desconexi\u00f3n de referencias activas se puede simplificar con una revisi\u00f3n m\u00e1s exhaustiva)."
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            "url": "https://git.kernel.org/stable/c/6c81f1c7812c61f187bed1b938f1d2e391d503ab"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/72275c888f8962b406ee9c6885c79bf68cca5a63"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-05T14:56:20+00:00",
      "cve": "CVE-2025-38282",
      "id": "CVE-2025-38282",
      "initial_release_date": "2025-07-10T00:00:00+00:00",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "92",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernfs: Relax constraint in draining guard",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38282.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2025-11-03T17:36:11.856Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2025-38282",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-11-05T20:53:01.163475Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-11-05T20:53:02.964Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/kernfs/dir.c",
                "fs/kernfs/file.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "2d6a67c2b3b87808a347dc1047b520a9dd177a4f",
                  "status": "affected",
                  "version": "bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72",
                  "versionType": "git"
                },
                {
                  "lessThan": "6c81f1c7812c61f187bed1b938f1d2e391d503ab",
                  "status": "affected",
                  "version": "bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72",
                  "versionType": "git"
                },
                {
                  "lessThan": "6bfb154f95d5f0ab7ed056f23aba8c1a94cb3927",
                  "status": "affected",
                  "version": "bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72",
                  "versionType": "git"
                },
                {
                  "lessThan": "72275c888f8962b406ee9c6885c79bf68cca5a63",
                  "status": "affected",
                  "version": "bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72",
                  "versionType": "git"
                },
                {
                  "lessThan": "071d8e4c2a3b0999a9b822e2eb8854784a350f8a",
                  "status": "affected",
                  "version": "bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/kernfs/dir.c",
                "fs/kernfs/file.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.1"
                },
                {
                  "lessThan": "6.1",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.142",
                  "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": "6.1.142",
                      "versionStartIncluding": "6.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.94",
                      "versionStartIncluding": "6.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.34",
                      "versionStartIncluding": "6.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.15.3",
                      "versionStartIncluding": "6.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.16",
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                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkernfs: Relax constraint in draining guard\n\nThe active reference lifecycle provides the break/unbreak mechanism but\nthe active reference is not truly active after unbreak -- callers don\u0027t\nuse it afterwards but it\u0027s important for proper pairing of kn-\u003eactive\ncounting. Assuming this mechanism is in place, the WARN check in\nkernfs_should_drain_open_files() is too sensitive -- it may transiently\ncatch those (rightful) callers between\nkernfs_unbreak_active_protection() and kernfs_put_active() as found out by Chen\nRidong:\n\n\tkernfs_remove_by_name_ns\tkernfs_get_active // active=1\n\t__kernfs_remove\t\t\t\t\t  // active=0x80000002\n\tkernfs_drain\t\t\t...\n\twait_event\n\t//waiting (active == 0x80000001)\n\t\t\t\t\tkernfs_break_active_protection\n\t\t\t\t\t// active = 0x80000001\n\t// continue\n\t\t\t\t\tkernfs_unbreak_active_protection\n\t\t\t\t\t// active = 0x80000002\n\t...\n\tkernfs_should_drain_open_files\n\t// warning occurs\n\t\t\t\t\tkernfs_put_active\n\nTo avoid the false positives (mind panic_on_warn) remove the check altogether.\n(This is meant as quick fix, I think active reference break/unbreak may be\nsimplified with larger rework.)"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T21:24:51.633Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/2d6a67c2b3b87808a347dc1047b520a9dd177a4f"
            },
            {
              "url": "https://git.kernel.org/stable/c/6c81f1c7812c61f187bed1b938f1d2e391d503ab"
            },
            {
              "url": "https://git.kernel.org/stable/c/6bfb154f95d5f0ab7ed056f23aba8c1a94cb3927"
            },
            {
              "url": "https://git.kernel.org/stable/c/72275c888f8962b406ee9c6885c79bf68cca5a63"
            },
            {
              "url": "https://git.kernel.org/stable/c/071d8e4c2a3b0999a9b822e2eb8854784a350f8a"
            }
          ],
          "title": "kernfs: Relax constraint in draining guard",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-38282",
        "datePublished": "2025-07-10T07:42:00.395Z",
        "dateReserved": "2025-04-16T04:51:24.000Z",
        "dateUpdated": "2026-11-05T21:02:30.419Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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