VULNERABILITY INTELLIGENCE

CVE-2023-1076

CVSS score5.5 MEDIUM
EPSS probability0.25%
CISA KEVNot currently listed
Published2023-03-27
Last modified2026-06-17
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. The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function. While it will be often correct, as tuntap devices require CAP_NET_ADMIN, it may not always be the case, e.g., a non-root user only having that capability. This would make tun/tap sockets being incorrectly treated in filtering/routing decisions, possibly bypassing network filters.

Weakness classification

  • secalert@redhat.com: CWE-791
  • nvd@nist.gov: CWE-843

Primary references