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CVE-2026-23189

Estado: AnalizadaMedia (5.5)—

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

ceph: fix NULL pointer dereference in ceph_mds_auth_match()

The CephFS kernel client has regression starting from 6.18-rc1. We have issue in ceph_mds_auth_match() if fs_name == NULL:

Patrick Donnelly suggested that: In summary, we should definitely start decoding `fs_name` from the MDSMap and do strict authorizations checks against it. Note that the `-o mds_namespace=foo` should only be used for selecting the file system to mount and nothing else. It's possible no mds_namespace is specified but the kernel will mount the only file system that exists which may have name "foo".

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This patch reworks ceph_mdsmap_decode() and namespace_equals() with the goal of supporting the suggested concept. Now struct ceph_mdsmap contains m_fs_name field that receives copy of extracted FS name by ceph_extract_encoded_string(). For the case of "old" CephFS file systems, it is used "cephfs" name.

Detalles técnicos trazas, registros y código del informe original
    const char fs_name = mdsc->fsc->mount_options->mds_namespace;
    ...
    if (auth->match.fs_name && strcmp(auth->match.fs_name, fs_name)) {
            / fsname mismatch, try next one */
            return 0;
    }

[ idryomov: replace redundant %*pE with %s in ceph_mdsmap_decode(),
  get rid of a series of strlen() calls in ceph_namespace_match(),
  drop changes to namespace_equals() body to avoid treating empty
  mds_namespace as equal, drop changes to ceph_mdsc_handle_fsmap()
  as namespace_equals() isn't an equivalent substitution there ]

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-23189",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "product": "Linux",
          "versions": [
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            "fs/ceph/mdsmap.h",
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              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
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          ],
          "programFiles": [
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            "fs/ceph/mdsmap.c",
            "fs/ceph/mdsmap.h",
            "fs/ceph/super.h",
            "include/linux/ceph/ceph_fs.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-02-14T17:15:56.703",
  "references": [
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix NULL pointer dereference in ceph_mds_auth_match()\n\nThe CephFS kernel client has regression starting from 6.18-rc1.\nWe have issue in ceph_mds_auth_match() if fs_name == NULL:\n\n    const char fs_name = mdsc->fsc->mount_options->mds_namespace;\n    ...\n    if (auth->match.fs_name && strcmp(auth->match.fs_name, fs_name)) {\n            / fsname mismatch, try next one */\n            return 0;\n    }\n\nPatrick Donnelly suggested that: In summary, we should definitely start\ndecoding `fs_name` from the MDSMap and do strict authorizations checks\nagainst it. Note that the `-o mds_namespace=foo` should only be used for\nselecting the file system to mount and nothing else. It's possible\nno mds_namespace is specified but the kernel will mount the only\nfile system that exists which may have name \"foo\".\n\nThis patch reworks ceph_mdsmap_decode() and namespace_equals() with\nthe goal of supporting the suggested concept. Now struct ceph_mdsmap\ncontains m_fs_name field that receives copy of extracted FS name\nby ceph_extract_encoded_string(). For the case of \"old\" CephFS file\nsystems, it is used \"cephfs\" name.\n\n[ idryomov: replace redundant %*pE with %s in ceph_mdsmap_decode(),\n  get rid of a series of strlen() calls in ceph_namespace_match(),\n  drop changes to namespace_equals() body to avoid treating empty\n  mds_namespace as equal, drop changes to ceph_mdsc_handle_fsmap()\n  as namespace_equals() isn't an equivalent substitution there ]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nceph: soluciona la desreferencia de puntero NULL en ceph_mds_auth_match()\n\nEl cliente del kernel de CephFS tiene una regresión a partir de 6.18-rc1.\nTenemos un problema en ceph_mds_auth_match() si fs_name == NULL:\n\n    const char fs_name = mdsc->fsc->mount_options->mds_namespace;\n    ...\n    if (auth->match.fs_name && strcmp(auth->match.fs_name, fs_name)) {\n            / el nombre de sistema de archivos no coincide, intentar el siguiente */\n            return 0;\n    }\n\nPatrick Donnelly sugirió que: En resumen, definitivamente deberíamos empezar a decodificar 'fs_name' del MDSMap y realizar controles de autorización estrictos contra él. Tenga en cuenta que '-o mds_namespace=foo' solo debe usarse para seleccionar el sistema de archivos a montar y nada más. Es posible que no se especifique ningún mds_namespace, pero el kernel montará el único sistema de archivos que existe, el cual puede tener el nombre 'foo'.\n\nEste parche reelabora ceph_mdsmap_decode() y namespace_equals() con el objetivo de apoyar el concepto sugerido. Ahora la estructura ceph_mdsmap contiene el campo m_fs_name que recibe una copia del nombre de FS extraído por ceph_extract_encoded_string(). Para el caso de sistemas de archivos CephFS 'antiguos', se utiliza el nombre 'cephfs'.\n\n[ idryomov: reemplazar el redundante %*pE con %s en ceph_mdsmap_decode(), eliminar una serie de llamadas a strlen() en ceph_namespace_match(), descartar cambios en el cuerpo de namespace_equals() para evitar tratar un mds_namespace vacío como igual, descartar cambios en ceph_mdsc_handle_fsmap() ya que namespace_equals() no es una sustitución equivalente allí ]"
    }
  ],
  "lastModified": "2026-06-17T10:21:03.920",
  "configurations": [
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