CVE-2023-39191

Name: CVE-2023-39191
Creator: NVD / NIST
Published: 2023-10-04T19:15:10.21+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.52%

Last modified Jun 17, 2026

CVE-2023-39191 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. An improper input validation flaw was found in the eBPF subsystem in the Linux kernel. The issue occurs due to a lack of proper validation of dynamic pointers within user-supplied eBPF programs prior to executing them. EPSS estimates a 0.52% chance of exploitation in the next 30 days.

Description

An improper input validation flaw was found in the eBPF subsystem in the Linux kernel. The issue occurs due to a lack of proper validation of dynamic pointers within user-supplied eBPF programs prior to executing them. This may allow an attacker with CAP_BPF privileges to escalate privileges and execute arbitrary code in the context of the kernel.

Metrics

CVSS 3.1

8.2/10

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

EPSS Probability

0.52%

39.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 5.19, < 6.3
Fedoraproject	Fedora	38
Redhat	Enterprise Linux	9.0

References

https://access.redhat.com/errata/RHSA-2023:6583Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0381Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0439Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0448Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-39191Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2226783Issue Tracking, Patch, Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-CAN-19399/Patch, Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2023:6583Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0381Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0439Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0448Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-39191Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2226783Issue Tracking, Patch, Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-CAN-19399/Patch, Third Party Advisory, VDB Entry

Timeline

Published: Oct 4, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-39191?

How severe is CVE-2023-39191?

CVE-2023-39191 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.52% probability of exploitation in the next 30 days.

How do I fix CVE-2023-39191?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-39191?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST