gsd-2023-23586
Vulnerability from gsd
Modified
2023-12-13 01:20
Details
Due to a vulnerability in the io_uring subsystem, it is possible to leak kernel memory information to the user process. timens_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 788d0824269bef539fe31a785b1517882eafed93 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring
Aliases
Aliases
CVE-2023-23586


To clipboard 

{
  "GSD": {
    "alias": "CVE-2023-23586",
    "id": "GSD-2023-23586",
    "references": [
      "https://www.suse.com/security/cve/CVE-2023-23586.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-23586"
      ],
      "details": "Due to a vulnerability in the io_uring subsystem, it is possible to leak kernel memory information to the user process. timens_install calls current_is_single_threaded to determine if the current process is single-threaded, but this call does not consider io_uring\u0027s io_worker threads, thus it is possible to insert a time namespace\u0027s vvar page to process\u0027s memory space via a page fault. When this time namespace is destroyed, the vvar page is also freed, but not removed from the process\u0027 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 788d0824269bef539fe31a785b1517882eafed93 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring",
      "id": "GSD-2023-23586",
      "modified": "2023-12-13T01:20:50.167541Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@google.com",
        "ID": "CVE-2023-23586",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux Kernel",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c=",
                          "version_name": "5.6",
                          "version_value": "5.10.161"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "credits": [
        {
          "lang": "en",
          "value": "Bing-Jhong Billy Jheng of Starlabs"
        }
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      "data_type": "CVE",
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      "description": {
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            "value": "Due to a vulnerability in the io_uring subsystem, it is possible to leak kernel memory information to the user process. timens_install calls current_is_single_threaded to determine if the current process is single-threaded, but this call does not consider io_uring\u0027s io_worker threads, thus it is possible to insert a time namespace\u0027s vvar page to process\u0027s memory space via a page fault. When this time namespace is destroyed, the vvar page is also freed, but not removed from the process\u0027 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 788d0824269bef539fe31a785b1517882eafed93 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring"
          }
        ]
      },
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      "impact": {
        "cvss": [
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            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "cweId": "CWE-416",
                "lang": "eng",
                "value": "CWE-416 Use After Free"
              }
            ]
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        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y\u0026id=788d0824269bef539fe31a785b1517882eafed93",
            "refsource": "MISC",
            "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y\u0026id=788d0824269bef539fe31a785b1517882eafed93"
          },
          {
            "name": "https://kernel.dance/#788d0824269bef539fe31a785b1517882eafed93",
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        ]
      },
      "source": {
        "discovery": "EXTERNAL"
      }
    },
    "nvd.nist.gov": {
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        "nodes": [
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            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "5.10.161",
                "versionStartIncluding": "5.6",
                "vulnerable": true
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            "operator": "OR"
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        "CVE_data_meta": {
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          "ID": "CVE-2023-23586"
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        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "Due to a vulnerability in the io_uring subsystem, it is possible to leak kernel memory information to the user process. timens_install calls current_is_single_threaded to determine if the current process is single-threaded, but this call does not consider io_uring\u0027s io_worker threads, thus it is possible to insert a time namespace\u0027s vvar page to process\u0027s memory space via a page fault. When this time namespace is destroyed, the vvar page is also freed, but not removed from the process\u0027 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 788d0824269bef539fe31a785b1517882eafed93 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring"
            }
          ]
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        "problemtype": {
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              "name": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y\u0026id=788d0824269bef539fe31a785b1517882eafed93",
              "refsource": "MISC",
              "tags": [
                "Mailing List",
                "Patch"
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              "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y\u0026id=788d0824269bef539fe31a785b1517882eafed93"
            },
            {
              "name": "https://kernel.dance/#788d0824269bef539fe31a785b1517882eafed93",
              "refsource": "MISC",
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              "url": "https://kernel.dance/#788d0824269bef539fe31a785b1517882eafed93"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2023-02-27T19:15Z",
      "publishedDate": "2023-02-17T13:15Z"
    }
  }
}


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