Bug 2383466 (CVE-2025-38432) - CVE-2025-38432 kernel: net: netpoll: Initialize UDP checksum field before checksumming
Summary: CVE-2025-38432 kernel: net: netpoll: Initialize UDP checksum field before che...
Keywords:
Status: NEW
Alias: CVE-2025-38432
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-07-25 15:02 UTC by OSIDB Bzimport
Modified: 2025-07-27 14:38 UTC (History)
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Description OSIDB Bzimport 2025-07-25 15:02:26 UTC 
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().
Comment 1 Jon Moroney 2025-07-25 17:38:31 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025072516-CVE-2025-38432-ce36@gregkh/T
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