VULNERABILITY INTELLIGENCE

CVE-2023-4194

CVSS score5.5 MEDIUM
EPSS probability0.27%
CISA KEVNot currently listed
Published2023-08-07
Last modified2026-11-03
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Description

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.

Weakness classification

  • CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')
  • CWE-863: Incorrect Authorization

Primary references