CVE-2015-8952 (GCVE-0-2015-8952)

Vulnerability from cvelistv5 – Published: 2016-10-16 21:00 – Updated: 2024-08-06 08:36
VLAI
Summary
The mbcache feature in the ext2 and ext4 filesystem implementations in the Linux kernel before 4.6 mishandles xattr block caching, which allows local users to cause a denial of service (soft lockup) via filesystem operations in environments that use many attributes, as demonstrated by Ceph and Samba.
Severity
5.5 (Medium)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • n/a
Assigner
mitre CNA under the mitre root
CNA scorecard E 28/100 over 2286 records in the last 180 days details
References
Date Public
2015-11-05 00:00
Show details on NVD website
To clipboard 

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      "sourceIdentifier": "cve@mitre.org",
      "vulnStatus": "Modified",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-19"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "nvd": {
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          {
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          {
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            "value": "The mbcache feature in the ext2 and ext4 filesystem implementations in the Linux kernel before 4.6 mishandles xattr block caching, which allows local users to cause a denial of service (soft lockup) via filesystem operations in environments that use many attributes, as demonstrated by Ceph and Samba."
          },
          {
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            "value": "La funcionalidad mbcache en las implementaciones del sistema de archivos ext2 y ext4 en el kernel de Linux en versiones anteriores a 4.6 no maneja adecuadamente bloque de almacenamiento en cach\u00e9 xattr, lo que permite a usuarios locales provocar una denegaci\u00f3n de servicio (bloqueo d\u00e9bil) a trav\u00e9s de operaciones de sistema de archivos en entornos que usan muchos atributos, como se demuestra por Ceph y Samba."
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        "id": "CVE-2015-8952",
        "lastModified": "2026-05-06T22:30:45.220",
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                "integrityImpact": "NONE",
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                "version": "2.0"
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              "exploitabilityScore": 3.9,
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              "obtainAllPrivilege": false,
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                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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            }
          ]
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        "published": "2016-10-16T21:59:01.910",
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            "tags": [
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                "value": "CWE-19"
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    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T11:58:33+00:00",
      "cve": "CVE-2015-8952",
      "id": "CVE-2015-8952",
      "initial_release_date": "2015-01-01T00:00:00+00:00",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "54",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mbcache code subject to softlockup DOS in cache management",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2015/cve-2015-8952.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-26T01:08:14Z",
      "cve": "CVE-2015-8952",
      "id": "CVE-2015-8952",
      "initial_release_date": "2023-02-15T05:10:21Z",
      "product_status:known_not_affected": "235",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2015-8952",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2015-8952.json",
      "version": "14"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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