Bug 2379212 (CVE-2025-38270)

Summary: CVE-2025-38270 kernel: net: drv: netdevsim: don't napi_complete() from netpoll
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-07-10 08:03:52 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: drv: netdevsim: don't napi_complete() from netpoll

netdevsim supports netpoll. Make sure we don't call napi_complete()
from it, since it may not be scheduled. Breno reports hitting a
warning in napi_complete_done():

WARNING: CPU: 14 PID: 104 at net/core/dev.c:6592 napi_complete_done+0x2cc/0x560
  __napi_poll+0x2d8/0x3a0
  handle_softirqs+0x1fe/0x710

This is presumably after netpoll stole the SCHED bit prematurely.
Comment 1 Avinash Hanwate 2025-07-11 07:46:17 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025071008-CVE-2025-38270-c7b0@gregkh/T