CVE-2025-21975 net/mlx5: handle errors in mlx5_chains_create_table()

What is CVE-2025-21975?

CVE-2025-21975 is a medium-severity vulnerability in Linux kernel, published on 1 Apr 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: handle errors in mlx5_chains_create_table()

In mlx5_chains_create_table(), the return value of mlx5_get_fdb_sub_ns() and mlx5_get_flow_namespace() must be checked to prevent NULL pointer dereferences. If either function fails, the function should log error message with mlx5_core_warn() and return error pointer.

Weakness: CWE-476

Which versions are affected by CVE-2025-21975?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2025-21975?

Apply the vendor's patch.

Is CVE-2025-21975 being exploited?

There is no known exploitation of CVE-2025-21975 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-2025-21975, DEBIAN-CVE-2025-21975, GHSA-7wv2-745f-m4cr, ROOT-OS-UBUNTU-2404-CVE-2025-21975, UBUNTU-CVE-2025-21975.