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

Vulnerability from cvelistv5 – Published: 2023-08-07 13:19 – Updated: 2026-11-07 11:31
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-03 16:14 UTC
CWE
  • CWE-843 - Access of Resource Using Incompatible Type
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1188 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::appstream
    cpe:/a:redhat:enterprise_linux:9::crb
    cpe:/a:redhat:enterprise_linux:9::nfv
    cpe:/a:redhat:enterprise_linux:9::realtime
    cpe:/o:redhat:enterprise_linux:9::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:rhel_els:6
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:rhel_els:7
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8     cpe:/a:redhat:enterprise_linux:8
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9     cpe:/a:redhat:enterprise_linux:9
Create a notification for this product.
Red Hat Red Hat Virtualization 4     cpe:/a:redhat:rhev_manager: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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