Vulnerability record/PUBLISHED/Published Oct 9, 2023 17:57:44 UTC

CVE-2023-39189

A flaw was found in the Netfilter subsystem in the Linux kernel. The nfnl_osf_add_callback function did not validate the user mode controlled opt_num field. This flaw allows a local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading to a crash or information disclosure.

Base score5.1/ 10

SeverityMediumCVSS 3.1

Exploitability / impact

CVSS metric breakdown

Vector-derived attributes

Base severityMedium

Attack vectorLocalAV

Attack complexityLowAC

Privileges requiredHighPR

User interactionNoneUI

ScopeUnchangedS

Confidentiality impactHighC

Integrity impactNoneI

Availability impactLowA

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

CVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.

Record context

CVE Numbering Authorityredhat

Last updatedNov 7, 2026 11:32:43 UTC

PublishedOct 9, 2023 17:57:44 UTC

ReservedJul 25, 2023 16:01:14 UTC