github - ghsa-4g8j-hwjq-h8fr

GHSA-4G8J-HWJQ-H8FR

Vulnerability from github – Published: 2025-12-04 18:30 – Updated: 2025-12-04 18:30

Details

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

gfs2: Fix unlikely race in gdlm_put_lock

In gdlm_put_lock(), there is a small window of time in which the DFL_UNMOUNT flag has been set but the lockspace hasn't been released, yet. In that window, dlm may still call gdlm_ast() and gdlm_bast(). To prevent it from dereferencing freed glock objects, only free the glock if the lockspace has actually been released.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40242"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-04T16:16:17Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Fix unlikely race in gdlm_put_lock\n\nIn gdlm_put_lock(), there is a small window of time in which the\nDFL_UNMOUNT flag has been set but the lockspace hasn\u0027t been released,\nyet.  In that window, dlm may still call gdlm_ast() and gdlm_bast().\nTo prevent it from dereferencing freed glock objects, only free the\nglock if the lockspace has actually been released.",
  "id": "GHSA-4g8j-hwjq-h8fr",
  "modified": "2025-12-04T18:30:52Z",
  "published": "2025-12-04T18:30:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40242"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/279bde3bbb0ac0bad5c729dfa85983d75a5d7641"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/28c4d9bc0708956c1a736a9e49fee71b65deee81"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64c61b4ac645222fa7b724cef616c1f862a72a40"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-40242 (GCVE-0-2025-40242)

Vulnerability from cvelistv5 – Published: 2025-12-04 15:31 – Updated: 2025-12-04 15:31

Summary

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix unlikely race in gdlm_put_lock In gdlm_put_lock(), there is a small window of time in which the DFL_UNMOUNT flag has been set but the lockspace hasn't been released, yet. In that window, dlm may still call gdlm_ast() and gdlm_bast(). To prevent it from dereferencing freed glock objects, only free the glock if the lockspace has actually been released.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/279bde3bbb0ac0bad…
	https://git.kernel.org/stable/c/64c61b4ac645222fa…
	https://git.kernel.org/stable/c/28c4d9bc0708956c1…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 279bde3bbb0ac0bad5c729dfa85983d75a5d7641 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 64c61b4ac645222fa7b724cef616c1f862a72a40 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 28c4d9bc0708956c1a736a9e49fee71b65deee81 (git)

Linux

Unaffected: 6.12.56 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/gfs2/lock_dlm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "279bde3bbb0ac0bad5c729dfa85983d75a5d7641",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "64c61b4ac645222fa7b724cef616c1f862a72a40",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "28c4d9bc0708956c1a736a9e49fee71b65deee81",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/gfs2/lock_dlm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.56",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Fix unlikely race in gdlm_put_lock\n\nIn gdlm_put_lock(), there is a small window of time in which the\nDFL_UNMOUNT flag has been set but the lockspace hasn\u0027t been released,\nyet.  In that window, dlm may still call gdlm_ast() and gdlm_bast().\nTo prevent it from dereferencing freed glock objects, only free the\nglock if the lockspace has actually been released."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-04T15:31:31.497Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/279bde3bbb0ac0bad5c729dfa85983d75a5d7641"
        },
        {
          "url": "https://git.kernel.org/stable/c/64c61b4ac645222fa7b724cef616c1f862a72a40"
        },
        {
          "url": "https://git.kernel.org/stable/c/28c4d9bc0708956c1a736a9e49fee71b65deee81"
        }
      ],
      "title": "gfs2: Fix unlikely race in gdlm_put_lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40242",
    "datePublished": "2025-12-04T15:31:31.497Z",
    "dateReserved": "2025-04-16T07:20:57.181Z",
    "dateUpdated": "2025-12-04T15:31:31.497Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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-4G8J-HWJQ-H8FR

CVE-2025-40242 (GCVE-0-2025-40242)

Tags

Sightings

Nomenclature