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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
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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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-4194\",\"sourceIdentifier\":\"secalert@redhat.com\",\"published\":\"2023-08-07T14:15:11.743\",\"lastModified\":\"2026-06-17T06:37:17.120\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A flaw was found in the Linux kernel\u0027s 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-\u003ei_uid\\\" to sock_init_data_uid() as the last parameter and that turns out to not be accurate.\"},{\"lang\":\"es\",\"value\":\"Se ha encontrado un fallo en la funcionalidad TUN/TAP del kernel de Linux. Este problema podr\u00eda permitir a un usuario local eludir los filtros de red y obtener acceso no autorizado a algunos recursos. Los parches originales que solucionan CVE-2023-1076 son incorrectos o incompletos. El problema es que los siguientes commits upstream - a096ccca6e50 (\\\"tun: tun_chr_open(): inicializar correctamente el uid del socket\\\"), - 66b2c338adce (\\\"tap: tap_open(): inicializar correctamente el uid del socket\\\"), pasan \\\"inode-\u0026gt;i_uid\\\" a sock_init_data_uid() como \u00faltimo par\u00e1metro y resulta que no es correcto.\"}],\"affected\":[{\"source\":\"secalert@redhat.com\",\"affectedData\":[{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 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    "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-22T02:04:51Z",
      "cve": "CVE-2023-4194",
      "id": "CVE-2023-4194",
      "initial_release_date": "2023-08-08T01:32:48Z",
      "product_status:known_affected": "390",
      "product_status:known_not_affected": "42",
      "product_status:recommended": "1126",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-4194",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-4194.json",
      "version": "71"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.