# CVE-2025-40253: s390/ctcm: Fix double-kfree

CVE-2025-40253 is fixed in 18 products on 1 platform, first by DEBIAN-CVE-2025-40253, released December 4, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-40253
- Priority: High
- CVSS: 8.8 (Moderate)
- EPSS: 0.0032
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 4, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40253

## Description

In the Linux kernel, the following vulnerability has been resolved:  s390/ctcm: Fix double-kfree  The function 'mpc_rcvd_sweep_req(mpcginfo)' is called conditionally from function 'ctcmpc_unpack_skb'. It frees passed mpcginfo. After that a call to function 'kfree' in function 'ctcmpc_unpack_skb' frees it again.  Remove 'kfree' call in function 'mpc_rcvd_sweep_req(mpcginfo)'.  Bug detected by the clang static analyzer.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dtb-aarch64 opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-64kb opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 |
| Linux | kernel-azure opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-azure sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 |
| Linux | kernel-debug opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-default opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-default sles 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-default sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 |
| Linux | kernel-default-base opensuse-leap 15.6 | 6.4.0-150600.23.92.1.150600.12.42.2 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.27.1.160000.2.8 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-default-base sles 15.6 | 6.4.0-150600.23.92.1.150600.12.42.2 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.34.1.150700.17.23.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 |
| Linux | kernel-docs opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-docs sles 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 |
| Linux | kernel-kvmsmall opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-livepatch-SLE15-SP6_Update_21 sles 15.6 | 1-150600.13.5.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-livepatch-SLE15-SP7-RT_Update_10 sles 15.7 | 1-150700.1.3.1 | [SUSE-SU-2026:0962-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0962-1.md) | Mar 23, 2026 |
| Linux | kernel-livepatch-SLE15-SP7_Update_10 sles 15.7 | 1-150700.15.3.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 |
| Linux | kernel-obs-build opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-obs-build sles 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 |
| Linux | kernel-obs-qa opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-source opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-source sles 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-source sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 |
| Linux | kernel-syms opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-syms sles 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 |
| Linux | kernel-zfcpdump opensuse-leap 15.6 | 6.4.0-150600.23.92.1 | [SUSE-SU-2026:1041-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1041-1.md) | Mar 25, 2026 |
| Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.28.1 | [OPENSUSE-SU-2026:20572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20572-1.md) | Apr 20, 2026 |
| Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.159-1 | [DEBIAN-CVE-2025-40253](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40253.md) | Dec 4, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.12.63-1 | [DEBIAN-CVE-2025-40253](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40253.md) | Dec 4, 2025 |
| Linux | linux Debian 14 | 6.17.10-1 | [DEBIAN-CVE-2025-40253](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40253.md) | Dec 4, 2025 |

---

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

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