CVE-2023-3812 HIGH

CVE-2023-3812: Kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags

Vendor Red Hat
Product Red Hat Enterprise Linux 8
Weakness CWE-787
Published July 24, 2023
Last update February 26, 2026
View on NVD All CVEs

CVSS base score

7.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

An out-of-bounds memory access flaw was found in the Linux kernel’s TUN/TAP device driver functionality in how a user generates a malicious (too big) networking packet when napi frags is enabled. This flaw allows a local user to crash or potentially escalate their privileges on the system.

Key dates

02Disclosure timeline

July 24, 2023 CVE published
February 26, 2026 Record updated