Vulnerability-Lookup

GHSA-X4QH-8J3R-QP8V

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-18 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

of/overlay: only treat a positive changeset id as registered

of_overlay_fdt_apply() stores the idr_alloc() return value in ovcs->id before checking it. On failure the stored id is negative, free_overlay_changeset()'s "if (ovcs->id)" check passes, idr_remove() is called with a negative id and list_del() runs on ovcs->ovcs_list, which is not initialized until after the id allocation. An allocation failure at that point dereferences NULL.

Make free_overlay_changeset() treat only a strict-positive id as registered. The rest of the function already copes with a partially-initialized ovcs, so the error path stays a plain goto err_free_ovcs.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98854"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:39Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nof/overlay: only treat a positive changeset id as registered\n\nof_overlay_fdt_apply() stores the idr_alloc() return value in\novcs-\u003eid before checking it. On failure the stored id is negative,\nfree_overlay_changeset()\u0027s \"if (ovcs-\u003eid)\" check passes, idr_remove()\nis called with a negative id and list_del() runs on ovcs-\u003eovcs_list,\nwhich is not initialized until after the id allocation. An allocation\nfailure at that point dereferences NULL.\n\nMake free_overlay_changeset() treat only a strict-positive id as\nregistered. The rest of the function already copes with a\npartially-initialized ovcs, so the error path stays a plain\ngoto err_free_ovcs.",
  "id": "GHSA-x4qh-8j3r-qp8v",
  "modified": "2026-10-18T18:32:06Z",
  "published": "2026-10-18T18:32:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98854"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d1525fdcd3355672b7485d61e55df6824ab5ad1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44081d708b5b885487bac792db78324b7b4c267d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c08a54df9d33dcd6ff089adc9434b2c008af3a39"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c875407c34dadaef0599834ad9c815f4c9f50d15"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98854 (GCVE-0-2026-98854)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:51 – Updated: 2026-10-18 15:51

Title

of/overlay: only treat a positive changeset id as registered

Summary

In the Linux kernel, the following vulnerability has been resolved: of/overlay: only treat a positive changeset id as registered of_overlay_fdt_apply() stores the idr_alloc() return value in ovcs->id before checking it. On failure the stored id is negative, free_overlay_changeset()'s "if (ovcs->id)" check passes, idr_remove() is called with a negative id and list_del() runs on ovcs->ovcs_list, which is not initialized until after the id allocation. An allocation failure at that point dereferences NULL. Make free_overlay_changeset() treat only a strict-positive id as registered. The rest of the function already copes with a partially-initialized ovcs, so the error path stays a plain goto err_free_ovcs.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7100 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/c08a54df9d33dcd6f…
https://git.kernel.org/stable/c/0d1525fdcd3355672…
https://git.kernel.org/stable/c/c875407c34dadaef0…
https://git.kernel.org/stable/c/44081d708b5b88548…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 61b4de4e0b384f4a22c55c3bada604da49cec4e1 , < c08a54df9d33dcd6ff089adc9434b2c008af3a39 (git) Affected: 61b4de4e0b384f4a22c55c3bada604da49cec4e1 , < 0d1525fdcd3355672b7485d61e55df6824ab5ad1 (git) Affected: 61b4de4e0b384f4a22c55c3bada604da49cec4e1 , < c875407c34dadaef0599834ad9c815f4c9f50d15 (git) Affected: 61b4de4e0b384f4a22c55c3bada604da49cec4e1 , < 44081d708b5b885487bac792db78324b7b4c267d (git)
Linux	Linux	Affected: 4.15 Unaffected: 0 , < 4.15 (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.56 , ≤ 6.18.* (semver) Unaffected: 7.2.10 , ≤ 7.2.* (semver) Unaffected: 7.3-rc6 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/of/overlay.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c08a54df9d33dcd6ff089adc9434b2c008af3a39",
              "status": "affected",
              "version": "61b4de4e0b384f4a22c55c3bada604da49cec4e1",
              "versionType": "git"
            },
            {
              "lessThan": "0d1525fdcd3355672b7485d61e55df6824ab5ad1",
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              "versionType": "git"
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          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc6",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.15",
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                },
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nof/overlay: only treat a positive changeset id as registered\n\nof_overlay_fdt_apply() stores the idr_alloc() return value in\novcs-\u003eid before checking it. On failure the stored id is negative,\nfree_overlay_changeset()\u0027s \"if (ovcs-\u003eid)\" check passes, idr_remove()\nis called with a negative id and list_del() runs on ovcs-\u003eovcs_list,\nwhich is not initialized until after the id allocation. An allocation\nfailure at that point dereferences NULL.\n\nMake free_overlay_changeset() treat only a strict-positive id as\nregistered. The rest of the function already copes with a\npartially-initialized ovcs, so the error path stays a plain\ngoto err_free_ovcs."
        }
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      "providerMetadata": {
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    "dateReserved": "2026-09-25T10:25:14.376Z",
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    "state": "PUBLISHED"
  },
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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.

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