CVE-2023-3439

Name: CVE-2023-3439
Creator: NVD / NIST
Published: 2023-06-28T21:15:10.517+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.7/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2023-3439 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. A flaw was found in the MCTP protocol in the Linux kernel. The function mctp_unregister() reclaims the device's relevant resource when a netcard detaches. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

A flaw was found in the MCTP protocol in the Linux kernel. The function mctp_unregister() reclaims the device's relevant resource when a netcard detaches. However, a running routine may be unaware of this and cause the use-after-free of the mdev->addrs object, potentially leading to a denial of service.

Metrics

CVSS 3.1

4.7/10

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

EPSS Probability

0.33%

24.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Linux	Linux Kernel	>= 5.15, <= 5.17	—
Linux	Linux Kernel	5.18	Rc1

References

http://www.openwall.com/lists/oss-security/2023/07/02/1Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2217915Issue Tracking, Patch, Third Party Advisory
https://github.com/torvalds/linux/commit/b561275d633bcd8e0e8055ab86f1a13df75a0269Patch
http://www.openwall.com/lists/oss-security/2023/07/02/1Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2217915Issue Tracking, Patch, Third Party Advisory
https://github.com/torvalds/linux/commit/b561275d633bcd8e0e8055ab86f1a13df75a0269Patch

Timeline

Published: Jun 28, 2023
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-3439?

How severe is CVE-2023-3439?

CVE-2023-3439 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2023-3439?

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-2023-3439?

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

Scan your code now

Source: NVD / NIST