FKIE_CVE-2026-53042

Vulnerability from fkie_nvd - Published: 2026-06-24 17:17 - Updated: 2026-06-24 17:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal CXL is linked before fwctl in drivers/Makefile. Both use `module_init, so `cxl_pci_driver_init()` runs first. When `cxl_pci_probe()` calls `fwctl_register()` and then `device_add()`, fwctl_class is not yet registered because fwctl_init() hasn't run, causing `class_to_subsys()` to return NULL and skip knode_class initialization. On device removal, `class_to_subsys()` returns non-NULL, and `device_del()` calls `klist_del()` on the uninitialized knode, triggering a NULL pointer dereference.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1075f2f590fdac147f8b8010c35b606564b5c7d7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a28f56988c8e5bb9375806a5cfb0bf54d662ae3f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a55f80233f384dc89ef3425b2e1dd0e6d44bcf29
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/fwctl/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a28f56988c8e5bb9375806a5cfb0bf54d662ae3f",
              "status": "affected",
              "version": "858ce2f56b5253063f61f6b1c58a6dbf5d71da0b",
              "versionType": "git"
            },
            {
              "lessThan": "1075f2f590fdac147f8b8010c35b606564b5c7d7",
              "status": "affected",
              "version": "858ce2f56b5253063f61f6b1c58a6dbf5d71da0b",
              "versionType": "git"
            },
            {
              "lessThan": "a55f80233f384dc89ef3425b2e1dd0e6d44bcf29",
              "status": "affected",
              "version": "858ce2f56b5253063f61f6b1c58a6dbf5d71da0b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/fwctl/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfwctl: Fix class init ordering to avoid NULL pointer dereference on device removal\n\nCXL is linked before fwctl in drivers/Makefile. Both use `module_init, so\n`cxl_pci_driver_init()` runs first. When `cxl_pci_probe()` calls\n`fwctl_register()` and then `device_add()`, fwctl_class is not yet\nregistered because fwctl_init() hasn\u0027t run, causing `class_to_subsys()` to\nreturn NULL and skip knode_class initialization.\n\nOn device removal, `class_to_subsys()` returns non-NULL, and\n`device_del()` calls `klist_del()` on the uninitialized knode, triggering\na NULL pointer dereference."
    }
  ],
  "id": "CVE-2026-53042",
  "lastModified": "2026-06-24T17:17:15.967",
  "metrics": {},
  "published": "2026-06-24T17:17:15.967",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1075f2f590fdac147f8b8010c35b606564b5c7d7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a28f56988c8e5bb9375806a5cfb0bf54d662ae3f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a55f80233f384dc89ef3425b2e1dd0e6d44bcf29"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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