# CVE-2025-38717: net: kcm: Fix race condition in kcm_unattach()

CVE-2025-38717 is fixed in 35 products on 1 platform, first by DEBIAN-CVE-2025-38717, released September 4, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-38717
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 4, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38717

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: kcm: Fix race condition in kcm_unattach()  syzbot found a race condition when kcm_unattach(psock) and kcm_release(kcm) are executed at the same time.  kcm_unattach() is missing a check of the flag kcm->tx_stopped before calling queue_work().  If the kcm has a reserved psock, kcm_unattach() might get executed between cancel_work_sync() and unreserve_psock() in kcm_release(), requeuing kcm->tx_work right before kcm gets freed in kcm_done().  Remove kcm->tx_stopped and replace it by the less error-prone disable_work_sync().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool6.12 amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-64kb sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-default sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.6.1.160000.2.4 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-default-base sles 16.0 | 6.12.0-160000.6.1.160000.2.4 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-docs sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-livepatch-6.12.46-66.121 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-source sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-syms sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel6.12 amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-devel amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-headers amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-libbpf amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-libbpf-debuginfo amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-libbpf-devel amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-libbpf-static amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-tools amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.12.43-1 | [DEBIAN-CVE-2025-38717](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38717.md) | Sep 4, 2025 |
| Linux | linux Debian 14 | 6.16.3-1 | [DEBIAN-CVE-2025-38717](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38717.md) | Sep 4, 2025 |
| Linux | perf6.12 amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | python3-perf6.12 amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |
| Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.46-66.121.amzn2023 | [ALAS2023-2025-1208](https://patchblox.com/security/data/fix/linux/alas2023-2025-1208.md) | Sep 23, 2025 |

---

Data as of 2026-11-09T01:18:40Z 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.