CVE-2026-64376 (GCVE-0-2026-64376)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-11-06 16:44
VLAI
Title
firmware_loader: fix device reference leak in firmware_upload_register()
Summary
In the Linux kernel, the following vulnerability has been resolved: firmware_loader: fix device reference leak in firmware_upload_register() firmware_upload_register() -> fw_create_instance() -> device_initialize() After fw_create_instance() succeeds, the lifetime of the embedded struct device is expected to be managed through the device core reference counting, since fw_create_instance() has already called device_initialize(). In firmware_upload_register(), if alloc_lookup_fw_priv() fails after fw_create_instance() succeeds, the code reaches free_fw_sysfs and frees fw_sysfs directly instead of releasing the device reference with put_device(). This may leave the reference count of the embedded struct device unbalanced, resulting in a refcount leak. The issue was identified by a static analysis tool I developed and confirmed by manual review. Fix this by using put_device(fw_dev) in the failure path and letting fw_dev_release() handle the final cleanup, instead of freeing the instance directly from the error path.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 16:37 UTC
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: 97730bbb242cde22b7140acd202ffd88823886c9 , < 517676ec7dfca064e08f94007a4abd21969de0a0 (git)
Affected: 97730bbb242cde22b7140acd202ffd88823886c9 , < 46d403da376a8b7c1187193294953816e1a8d7fe (git)
Affected: 97730bbb242cde22b7140acd202ffd88823886c9 , < 2619b47a0c8114eef980a56ade7e3ef4b58eb384 (git)
Affected: 97730bbb242cde22b7140acd202ffd88823886c9 , < 92f41769e5fd16bcd9ba97500d0517332e0a5b45 (git)
Affected: 97730bbb242cde22b7140acd202ffd88823886c9 , < 15432f19562fdb9199cce6d9fc24db12c71ed574 (git)
Affected: 97730bbb242cde22b7140acd202ffd88823886c9 , < 896df22ee57648b0c505bd76ddbc6b2341834696 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                    "timestamp": "2026-11-06T16:37:42.844093Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-11-06T16:37:44.095Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/base/firmware_loader/sysfs_upload.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "517676ec7dfca064e08f94007a4abd21969de0a0",
                  "status": "affected",
                  "version": "97730bbb242cde22b7140acd202ffd88823886c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "46d403da376a8b7c1187193294953816e1a8d7fe",
                  "status": "affected",
                  "version": "97730bbb242cde22b7140acd202ffd88823886c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "2619b47a0c8114eef980a56ade7e3ef4b58eb384",
                  "status": "affected",
                  "version": "97730bbb242cde22b7140acd202ffd88823886c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "92f41769e5fd16bcd9ba97500d0517332e0a5b45",
                  "status": "affected",
                  "version": "97730bbb242cde22b7140acd202ffd88823886c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "15432f19562fdb9199cce6d9fc24db12c71ed574",
                  "status": "affected",
                  "version": "97730bbb242cde22b7140acd202ffd88823886c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "896df22ee57648b0c505bd76ddbc6b2341834696",
                  "status": "affected",
                  "version": "97730bbb242cde22b7140acd202ffd88823886c9",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/base/firmware_loader/sysfs_upload.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.19"
                },
                {
                  "lessThan": "5.19",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.178",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.145",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.96",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.39",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.1.*",
                  "status": "unaffected",
                  "version": "7.1.4",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.178",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.145",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.96",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.39",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.1.4",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.2",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware_loader: fix device reference leak in firmware_upload_register()\n\nfirmware_upload_register()\n  -\u003e fw_create_instance()\n     -\u003e device_initialize()\n\nAfter fw_create_instance() succeeds, the lifetime of the embedded struct\ndevice is expected to be managed through the device core reference\ncounting, since fw_create_instance() has already called\ndevice_initialize().\n\nIn firmware_upload_register(), if alloc_lookup_fw_priv() fails after\nfw_create_instance() succeeds, the code reaches free_fw_sysfs and frees\nfw_sysfs directly instead of releasing the device reference with\nput_device(). This may leave the reference count of the embedded struct\ndevice unbalanced, resulting in a refcount leak.\n\nThe issue was identified by a static analysis tool I developed and\nconfirmed by manual review. Fix this by using put_device(fw_dev) in the\nfailure path and letting fw_dev_release() handle the final cleanup,\ninstead of freeing the instance directly from the error path."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-17T04:54:27.297Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/517676ec7dfca064e08f94007a4abd21969de0a0"
            },
            {
              "url": "https://git.kernel.org/stable/c/46d403da376a8b7c1187193294953816e1a8d7fe"
            },
            {
              "url": "https://git.kernel.org/stable/c/2619b47a0c8114eef980a56ade7e3ef4b58eb384"
            },
            {
              "url": "https://git.kernel.org/stable/c/92f41769e5fd16bcd9ba97500d0517332e0a5b45"
            },
            {
              "url": "https://git.kernel.org/stable/c/15432f19562fdb9199cce6d9fc24db12c71ed574"
            },
            {
              "url": "https://git.kernel.org/stable/c/896df22ee57648b0c505bd76ddbc6b2341834696"
            }
          ],
          "title": "firmware_loader: fix device reference leak in firmware_upload_register()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-64376",
        "datePublished": "2026-07-25T08:50:27.577Z",
        "dateReserved": "2026-07-19T15:36:31.784Z",
        "dateUpdated": "2026-11-06T16:44:50.323Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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