# CVE-2023-3439: linux: A flaw was found in the MCTP protocol in the Linux kernel

CVE-2023-3439 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-3439, released June 28, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-3439
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0034
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 28, 2023

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.17.6-1 | [DEBIAN-CVE-2023-3439](https://patchblox.com/security/data/fix/linux/debian-cve-2023-3439.md) | Jun 28, 2023 |
| Linux | linux Debian 13.5 (trixie) | 5.17.6-1 | [DEBIAN-CVE-2023-3439](https://patchblox.com/security/data/fix/linux/debian-cve-2023-3439.md) | Jun 28, 2023 |
| Linux | linux Debian 14 | 5.17.6-1 | [DEBIAN-CVE-2023-3439](https://patchblox.com/security/data/fix/linux/debian-cve-2023-3439.md) | Jun 28, 2023 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.