What’s Vulnerable › Vulnerabilities

CVE-2024-44940: fou: remove warn in gue_gro_receive on unsupported protocol

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-08-26 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: fou: remove warn in gue_gro_receive on unsupported protocol Drop the WARN_ON_ONCE inn gue_gro_receive if the encapsulated type is not known or does not have a GRO handler. Such a packet is easily constructed. Syzbot generates them and sets off this warning. Remove the warning as it is expected and not actionable. The warning was previously reduced from WARN_ON to WARN_ON_ONCE in commit 270136613bf7 ("fou: Do WARN_ON_ONCE in gue_gro_receive for bad proto callbacks").

Affected products

• Debian Linux: 11.0
• Linux kernel: from 3.18 before 5.10.234; from 5.11 before 5.15.174; from 5.16 before 6.1.107; from 6.2 before 6.6.47; from 6.7 before 6.10.6 — fixed in 5.10.234, 5.15.174, 6.1.107, 6.10.6, 6.6.47

How to fix

Upgrade to a fixed version: Linux kernel 5.10.234, 5.15.174, 6.1.107, 6.10.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3db4395332e7050ef9ddeb3052e6b5019f2a2a59
• https://git.kernel.org/stable/c/440ab7f97261bc28501636a13998e1b1946d2e79
• https://git.kernel.org/stable/c/5a2e37bc648a2503bf6d687aed27b9f4455d82eb
• https://git.kernel.org/stable/c/a925a200299a6dfc7c172f54da6f374edc930053
• https://git.kernel.org/stable/c/b1453a5616c7bd8acd90633ceba4e59105ba3b51
• https://git.kernel.org/stable/c/dd89a81d850fa9a65f67b4527c0e420d15bf836c
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
• https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

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