SARA / Free Tools / CVE / CVE-2023-4194

CVE-2023-4194 — A flaw was found in the Linux kernel's TUN/TAP functionality

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 followin

CVSS
5.5 MEDIUM
EPSS
0.01% (top 99.70%)
CWE
CWE-1188
Published
2023-08-07T13:19:44.215Z
Last modified
2026-02-18T17:16:51.343Z
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

01What is this vulnerability?

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…

02Affected products

VendorProductVersions
Red HatRed Hat Enterprise Linux 90:5.14.0-362.8.1.el9_3
Red HatRed Hat Enterprise Linux 90:5.14.0-362.8.1.el9_3
Red HatRed Hat Enterprise Linux 6unspecified
Red HatRed Hat Enterprise Linux 7unspecified
Red HatRed Hat Enterprise Linux 7unspecified
Red HatRed Hat Enterprise Linux 8unspecified
Red HatRed Hat Enterprise Linux 8unspecified
Red HatRed Hat Enterprise Linux 9unspecified
Red HatRed Hat Virtualization 4unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

CVE-2023-1076
Cited in vendor advisory

08Timeline

09References

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