CVE-2025-39830 net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path

What is CVE-2025-39830?

CVE-2025-39830 is a medium-severity denial of service vulnerability in Linux kernel, published on 16 Sep 2025. 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:

net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path

In the error path of hws_pool_buddy_init(), the buddy allocator cleanup doesn't free the allocator structure itself, causing a memory leak.

Add the missing kfree() to properly release all allocated memory.

Weakness: CWE-401

Which versions are affected by CVE-2025-39830?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2025-39830?

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-2025-39830 being exploited?

There is no known exploitation of CVE-2025-39830 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-2025-39830, DEBIAN-CVE-2025-39830, GHSA-h4gm-c37q-gjjr, ROOT-OS-DEBIAN-13-CVE-2025-39830, UBUNTU-CVE-2025-39830.