Vulnerability-Lookup

FKIE_CVE-2025-38549

Vulnerability from fkie_nvd - Published: 2025-08-16 12:15 - Updated: 2026-06-17 09:17

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: efivarfs: Fix memory leak of efivarfs_fs_info in fs_context error paths When processing mount options, efivarfs allocates efivarfs_fs_info (sfi) early in fs_context initialization. However, sfi is associated with the superblock and typically freed when the superblock is destroyed. If the fs_context is released (final put) before fill_super is called—such as on error paths or during reconfiguration—the sfi structure would leak, as ownership never transfers to the superblock. Implement the .free callback in efivarfs_context_ops to ensure any allocated sfi is properly freed if the fs_context is torn down before fill_super, preventing this memory leak.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/64e135f1eaba0bbb0cdee859af3328c68d5b9789	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/816d36973467d1c9c08a48bdffe4675e219a2e84	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e9fabe7036bb8be6071f39dc38605508f5f57b20	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/efivarfs/super.c"
          ],
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          "vendor": "Linux",
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            },
            {
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              "versionType": "git"
            }
          ]
        },
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          "product": "Linux",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "version": "6.12.40",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.15.8",
              "versionType": "semver"
            },
            {
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              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
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    }
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nefivarfs: Fix memory leak of efivarfs_fs_info in fs_context error paths\n\nWhen processing mount options, efivarfs allocates efivarfs_fs_info (sfi)\nearly in fs_context initialization. However, sfi is associated with the\nsuperblock and typically freed when the superblock is destroyed. If the\nfs_context is released (final put) before fill_super is called\u2014such as\non error paths or during reconfiguration\u2014the sfi structure would leak,\nas ownership never transfers to the superblock.\n\nImplement the .free callback in efivarfs_context_ops to ensure any\nallocated sfi is properly freed if the fs_context is torn down before\nfill_super, preventing this memory leak."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: efivarfs: corrige la p\u00e9rdida de memoria de efivarfs_fs_info en las rutas de error de fs_context Al procesar las opciones de montaje, efivarfs asigna efivarfs_fs_info (sfi) al principio de la inicializaci\u00f3n de fs_context. Sin embargo, sfi est\u00e1 asociado al superbloque y normalmente se libera cuando este se destruye. Si se libera fs_context (posici\u00f3n final) antes de llamar a fill_super (como en rutas de error o durante la reconfiguraci\u00f3n), la estructura sfi se filtrar\u00eda, ya que la propiedad nunca se transfiere al superbloque. Implementa la devoluci\u00f3n de llamada .free en efivarfs_context_ops para garantizar que cualquier sfi asignado se libere correctamente si fs_context se derriba antes que fill_super, lo que previene esta p\u00e9rdida de memoria."
    }
  ],
  "id": "CVE-2025-38549",
  "lastModified": "2026-06-17T09:17:05.360",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
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        "impactScore": 3.6,
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      }
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  "published": "2025-08-16T12:15:31.003",
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}

CVE-2025-38549 (GCVE-0-2025-38549)

Vulnerability from cvelistv5 – Published: 2025-08-16 11:34 – Updated: 2026-05-11 21:30

Title

efivarfs: Fix memory leak of efivarfs_fs_info in fs_context error paths

Summary

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7033 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/816d36973467d1c9c…
https://git.kernel.org/stable/c/e9fabe7036bb8be60…
https://git.kernel.org/stable/c/64e135f1eaba0bbb0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5329aa5101f73c451bcd48deaf3f296685849d9c , < 816d36973467d1c9c08a48bdffe4675e219a2e84 (git) Affected: 5329aa5101f73c451bcd48deaf3f296685849d9c , < e9fabe7036bb8be6071f39dc38605508f5f57b20 (git) Affected: 5329aa5101f73c451bcd48deaf3f296685849d9c , < 64e135f1eaba0bbb0cdee859af3328c68d5b9789 (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.12.40 , ≤ 6.12.* (semver) Unaffected: 6.15.8 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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        {
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          "programFiles": [
            "fs/efivarfs/super.c"
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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.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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