Bug 2307899 (CVE-2024-44940)

Summary: CVE-2024-44940 kernel: fou: remove warn in gue_gro_receive on unsupported protocol
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2308141    
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Description OSIDB Bzimport 2024-08-26 12:20:41 UTC
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").

Comment 1 Mauro Matteo Cascella 2024-08-27 12:21:52 UTC
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024082619-CVE-2024-44940-249f@gregkh/T