CVE-2023-4194 (GCVE-0-2023-4194)

Vulnerability from cvelistv5 – Published: 2023-08-07 13:19 – Updated: 2026-03-24 11:22
VLAI
Title
Kernel: tap: tap_open(): correctly initialize socket uid next fix of i_uid to current_fsuid
Summary
A flaw was found in the Linux kernel's TUN/TAP functionality. This issue could allow a local user to bypass network filters and gain unauthorized access to some resources. The original patches fixing CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits - a096ccca6e50 ("tun: tun_chr_open(): correctly initialize socket uid"), - 66b2c338adce ("tap: tap_open(): correctly initialize socket uid"), pass "inode->i_uid" to sock_init_data_uid() as the last parameter and that turns out to not be accurate.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1045 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:5.14.0-362.8.1.el9_3 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::crb
    cpe:/a:redhat:enterprise_linux:9::realtime
    cpe:/a:redhat:enterprise_linux:9::nfv
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
Create a notification for this product.
Red Hat Red Hat Virtualization 4     cpe:/o:redhat:rhev_hypervisor:4
Create a notification for this product.
Date Public
2023-08-03 00:00
Credits
This issue was discovered by Laszlo Ersek (Red Hat).
Show details on NVD website
To clipboard 

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                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "secalert@redhat.com",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "NONE",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2023-08-07T14:15:11.743",
        "references": [
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2023:6583"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://access.redhat.com/security/cve/CVE-2023-4194"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Issue Tracking",
              "Third Party Advisory"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2229498"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Mailing List",
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Mailing List",
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Mailing List",
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://access.redhat.com/errata/RHSA-2023:6583"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://access.redhat.com/security/cve/CVE-2023-4194"
          },
          {
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              "Third Party Advisory"
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          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/344H6HO6SSC4KT7PDFXSDIXKMKHISSGF/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TYLSJ2SAI7RF56ZLQ5CQWCJLVJSD73Q/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
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              "Patch",
              "Vendor Advisory"
            ],
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          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
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              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
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              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://security.netapp.com/advisory/ntap-20231027-0002/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://www.debian.org/security/2023/dsa-5480"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://www.debian.org/security/2023/dsa-5492"
          }
        ],
        "sourceIdentifier": "secalert@redhat.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-843"
              }
            ],
            "source": "secalert@redhat.com",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-843"
              },
              {
                "lang": "en",
                "value": "CWE-863"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-06T20:42:19+00:00",
      "cve": "CVE-2023-4194",
      "id": "CVE-2023-4194",
      "initial_release_date": "2023-08-03T00:00:00+00:00",
      "product_status:fixed": "267",
      "product_status:known_affected": "72",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tap: tap_open(): correctly initialize socket uid next fix of i_uid to current_fsuid",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-4194.json",
      "version": "3"
    }
  }
}



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