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

What is CVE-2025-71129?

CVE-2025-71129 is a medium-severity denial of service vulnerability in Linux kernel, published on 14 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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).

Which versions are affected by CVE-2025-71129?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2025-71129?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2025-71129 being exploited?

There is no known exploitation of CVE-2025-71129 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2025-71129, DEBIAN-CVE-2025-71129, GHSA-6c2w-77g9-cccc, ROOT-OS-DEBIAN-12-CVE-2025-71129, ROOT-OS-DEBIAN-13-CVE-2025-71129, ROOT-OS-UBUNTU-2404-CVE-2025-71129 and 1 more.