CVE-2026-74475

Description

In the Linux kernel, the following vulnerability has been resolved: vxlan: use neigh_ha_snapshot() in route_shortcircuit() The neighbour hardware address n->ha can be updated asynchronously by the neighbour subsystem, protected by n->ha_lock seqlock. Reading n->ha without holding the seqlock loop can lead to torn reads or reading a partially updated MAC address. Use neigh_ha_snapshot() in route_shortcircuit() to safely copy n->ha under read_seqbegin()/read_seqretry() lock protection before using it. Note that arp_reduce() and neigh_reduce() seem to have the same issue left for future patches.

References

• https://git.kernel.org/stable/c/05f2987f73daa05333fd713d05546142f9f7c5f0
• https://git.kernel.org/stable/c/8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d
• https://git.kernel.org/stable/c/d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0
• https://git.kernel.org/stable/c/ec341bb76d77b4c2948764375ee6bfeef4bb41c3
• https://git.kernel.org/stable/c/ff89415d34c3ab9f5312316423122e664ed3524f