CVE-2026-74475
CriticalCVSS 10.0Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, the vxlan module's route_shortcircuit() function reads the neighbour hardware address n->ha without holding the seqlock, which can lead to torn reads or partially updated MAC addresses.
Risk Assessment
This can lead to incorrect routing or network misbehavior, and in extreme cases to integrity issues in network data.
Recommendation
Apply the kernel patch that uses neigh_ha_snapshot() to safely copy the MAC address under seqlock protection.
Original NVD description (English source)
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.