Bug 2348509 (CVE-2025-21760)

Summary: CVE-2025-21760 kernel: ndisc: extend RCU protection in ndisc_send_skb()
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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Description OSIDB Bzimport 2025-02-27 03:01:13 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ndisc: extend RCU protection in ndisc_send_skb()

ndisc_send_skb() can be called without RTNL or RCU held.

Acquire rcu_read_lock() earlier, so that we can use dev_net_rcu()
and avoid a potential UAF.
Comment 1 Michal Findra 2025-02-27 11:44:33 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022604-CVE-2025-21760-fb9d@gregkh/T