Bug 2406739 (CVE-2025-40074)

Summary: CVE-2025-40074 kernel: ipv4: start using dst_dev_rcu()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-28 12:02:56 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ipv4: start using dst_dev_rcu()

Change icmpv4_xrlim_allow(), ip_defrag() to prevent possible UAF.

Change ipmr_prepare_xmit(), ipmr_queue_fwd_xmit(), ip_mr_output(),
ipv4_neigh_lookup() to use lockdep enabled dst_dev_rcu().
Comment 1 Jon Moroney 2025-10-28 19:07:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025102819-CVE-2025-40074-8719@gregkh/T