CVE-2025-37909 net: lan743x: Fix memleak issue when GSO enabled

What is CVE-2025-37909?

CVE-2025-37909 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 20 May 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: lan743x: Fix memleak issue when GSO enabled

Always map the `skb` to the LS descriptor. Previously skb was mapped to EXT descriptor when the number of fragments is zero with GSO enabled. Mapping the skb to EXT descriptor prevents it from being freed, leading to a memory leak

Weakness: CWE-401

Which versions are affected by CVE-2025-37909?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2025-37909?

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-2025-37909 being exploited?

There is no known exploitation of CVE-2025-37909 in the wild and no public exploit code.

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• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

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

Also known as BELL-CVE-2025-37909, DEBIAN-CVE-2025-37909, GHSA-pgg7-9g7g-jg57, ROOT-OS-DEBIAN-11-CVE-2025-37909, ROOT-OS-DEBIAN-12-CVE-2025-37909, ROOT-OS-UBUNTU-2204-CVE-2025-37909 and 2 more.