CVE-2026-23103
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
In the Linux kernel ipvlan driver, a locking issue was found where addrs_lock was per-device instead of per-port. The fix moves the lock to port level, preventing potential races when adding/removing IPv6 addresses without RTNL.
Risk Assessment
Organizations may face sporadic ipvlan interface misbehavior, especially with IPv6 configuration, leading to false-negative address busy checks or rare race conditions in the address hash table.
Recommendation
Update the Linux kernel to a version containing this fix (commit in mainline). If not possible, avoid concurrent IPv6 address changes on multiple ipvlan devices within the same port.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ipvlan: Make the addrs_lock be per port Make the addrs_lock be per port, not per ipvlan dev. Initial code seems to be written in the assumption, that any address change must occur under RTNL. But it is not so for the case of IPv6. So 1) Introduce per-port addrs_lock. 2) It was needed to fix places where it was forgotten to take lock (ipvlan_open/ipvlan_close) This appears to be a very minor problem though. Since it's highly unlikely that ipvlan_add_addr() will be called on 2 CPU simultaneously. But nevertheless, this could cause: 1) False-negative of ipvlan_addr_busy(): one interface iterated through all port->ipvlans + ipvlan->addrs under some ipvlan spinlock, and another added IP under its own lock. Though this is only possible for IPv6, since looks like only ipvlan_addr6_event() can be called without rtnl_lock. 2) Race since ipvlan_ht_addr_add(port) is called under different ipvlan->addrs_lock locks This should not affect performance, since add/remove IP is a rare situation and spinlock is not taken on fast paths.