{
  "id": "CVE-2023-23586",
  "sourceIdentifier": "cve-coordination@google.com",
  "published": "2023-02-17T13:15:10.737",
  "lastModified": "2023-11-07T04:07:47.083",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Due to a vulnerability in the io_uring subsystem, it is possible to leak kernel memory information to the user process.\u00a0timens_install calls current_is_single_threaded to determine if the current process is single-threaded, but this call does not consider io_uring's io_worker threads, thus it is possible to insert a time namespace's vvar page to process's memory space via a page fault. When this time namespace is destroyed, the vvar page is also freed, but not removed from the process' memory, and a next page allocated by the kernel will be still available from the user-space process and can leak memory contents via this (read-only) use-after-free vulnerability. We recommend upgrading past version 5.10.161 or commit\u00a0 788d0824269bef539fe31a785b1517882eafed93 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring \n"
    },
    {
      "lang": "es",
      "value": "Debido a una vulnerabilidad en el subsistema io_uring, es posible filtrar informaci\u00f3n de la memoria del kernel al proceso del usuario. timens_install llama a current_is_single_threaded para determinar si el proceso actual tiene un solo subproceso, pero esta llamada no considera los subprocesos io_worker de io_uring, por lo que es posible insertar una p\u00e1gina vvar de un espacio de nombres de tiempo en el espacio de memoria del proceso a trav\u00e9s de un error de p\u00e1gina. Cuando se destruye este espacio de nombres de tiempo, la p\u00e1gina vvar tambi\u00e9n se libera, pero no se elimina de la memoria del proceso, y una p\u00e1gina siguiente asignada por el kernel todav\u00eda estar\u00e1 disponible en el proceso de espacio de usuario y puede filtrar el contenido de la memoria a trav\u00e9s de esto (leer -solo) vulnerabilidad de Use-After-Free. Recomendamos actualizar la versi\u00f3n anterior 5.10.161 o el commit 788d0824269bef539fe31a785b1517882eafed93 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring"
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      },
      {
        "source": "cve-coordination@google.com",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    },
    {
      "source": "cve-coordination@google.com",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.6",
              "versionEndExcluding": "5.10.161",
              "matchCriteriaId": "E6D163C0-5FC9-4FB8-AF75-5C27891361A0"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y&id=788d0824269bef539fe31a785b1517882eafed93",
      "source": "cve-coordination@google.com",
      "tags": [
        "Mailing List",
        "Patch"
      ]
    },
    {
      "url": "https://kernel.dance/#788d0824269bef539fe31a785b1517882eafed93",
      "source": "cve-coordination@google.com",
      "tags": [
        "Patch"
      ]
    }
  ]
}