Vulnerability-Lookup

GHSA-Q56Q-RVW2-P4R2

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-24 18:32

Details

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, socxl_pci_driver_init()runs first. Whencxl_pci_probe()callsfwctl_register()and thendevice_add(), fwctl_class is not yet registered because fwctl_init() hasn't run, causingclass_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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53042"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:15Z",
    "severity": null
  },
  "details": "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": "GHSA-q56q-rvw2-p4r2",
  "modified": "2026-06-24T18:32:44Z",
  "published": "2026-06-24T18:32:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53042"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1075f2f590fdac147f8b8010c35b606564b5c7d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a28f56988c8e5bb9375806a5cfb0bf54d662ae3f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a55f80233f384dc89ef3425b2e1dd0e6d44bcf29"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53042 (GCVE-0-2026-53042)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29

Title

fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal

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.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/a28f56988c8e5bb93…
https://git.kernel.org/stable/c/1075f2f590fdac147…
https://git.kernel.org/stable/c/a55f80233f384dc89…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b , < a28f56988c8e5bb9375806a5cfb0bf54d662ae3f (git) Affected: 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b , < 1075f2f590fdac147f8b8010c35b606564b5c7d7 (git) Affected: 858ce2f56b5253063f61f6b1c58a6dbf5d71da0b , < a55f80233f384dc89ef3425b2e1dd0e6d44bcf29 (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/fwctl/main.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
              "version": "858ce2f56b5253063f61f6b1c58a6dbf5d71da0b",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "858ce2f56b5253063f61f6b1c58a6dbf5d71da0b",
              "versionType": "git"
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          "versions": [
            {
              "status": "affected",
              "version": "6.15"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "operator": "OR"
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        }
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      "descriptions": [
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          "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."
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    "datePublished": "2026-06-24T16:29:48.273Z",
    "dateReserved": "2026-06-09T07:44:35.380Z",
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}

Sightings

Author	Source	Type	Date	Other

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-Q56Q-RVW2-P4R2

CVE-2026-53042 (GCVE-0-2026-53042)

Tags

Sightings

Nomenclature