What’s Vulnerable › Vulnerabilities

CVE-2025-38432: net: netpoll: Initialize UDP checksum field before checksumming

• 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: 2025-07-25 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: net: netpoll: Initialize UDP checksum field before checksumming commit f1fce08e63fe ("netpoll: Eliminate redundant assignment") removed the initialization of the UDP checksum, which was wrong and broke netpoll IPv6 transmission due to bad checksumming. udph->check needs to be set before calling csum_ipv6_magic().

Affected products

• Linux kernel: from 6.15 before 6.15.5; 6.16-rc1, 6.16-rc2, 6.16-rc3 — fixed in 6.15.5

How to fix

Upgrade to a fixed version: Linux kernel 6.15.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/353016ec159f939a380ff6746476a779367ba9a3
• https://git.kernel.org/stable/c/f5990207026987a353d5a95204c4d9cb725637fd

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