# CVE-2025-71129: LoongArch: BPF: Sign extend kfunc call arguments

CVE-2025-71129 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-71129, released January 14, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-71129
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 14, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-71129

## Description

In the Linux kernel, the following vulnerability has been resolved:  LoongArch: BPF: Sign extend kfunc call arguments  The kfunc calls are native calls so they should follow LoongArch calling conventions. Sign extend its arguments properly to avoid kernel panic. This is done by adding a new emit_abi_ext() helper. The emit_abi_ext() helper performs extension in place meaning a value already store in the target register (Note: this is different from the existing sign_extend() helper and thus we can't reuse it).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.69-1 | [DEBIAN-CVE-2025-71129](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71129.md) | Jan 14, 2026 |
| Linux | linux Debian 14 | 6.18.5-1 | [DEBIAN-CVE-2025-71129](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71129.md) | Jan 14, 2026 |

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Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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