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

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-20 · updated 2026-10-15
Weakness: CWE-401

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

Affected products

Debian Linux: 11.0
Linux kernel: from 4.17 before 5.4.294; from 5.5 before 5.10.238; from 5.11 before 5.15.182; from 5.16 before 6.1.138; from 6.2 before 6.6.90; from 6.7 before 6.12.28 — fixed in 5.10.238, 5.15.182, 5.4.294, 6.1.138, 6.12.28, 6.14.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.238, 5.15.182, 5.4.294, 6.1.138. Check the vendor advisory for mitigations.

References

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