CVE-2026-63914

Status: UPDATED  |  Advisory ID: CVE-2026-63914

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

xfrm: route MIGRATE notifications to caller's netns

xfrm_send_migrate() in net/xfrm/xfrm_user.c and pfkey_send_migrate()

in net/key/af_key.c both hardcode &init_net for the multicast that

announces a successful XFRM_MSG_MIGRATE / SADB_X_MIGRATE.

XFRM_MSG_MIGRATE arrives on a per-netns NETLINK_XFRM socket, and the

rest of the xfrm/af_key netlink path was made netns-aware in 2008.

The other 14 multicast paths in xfrm_user.c route their event using

xs_net(x), xp_net(xp) or sock_net(skb->sk); only the migrate path

was missed.

Two consequences of the init_net hardcoding:

1. The notification (selector, old/new endpoint addresses, and the

km_address) is delivered to listeners on init_net's

XFRMNLGRP_MIGRATE / pfkey BROADCAST_ALL groups rather than on

the issuing netns. An IKE daemon running in init_net therefore

receives migration notifications originating from any other

netns on the host.

2. An IKE daemon running inside a non-init netns and subscribed

to its own XFRMNLGRP_MIGRATE / pfkey groups never receives the

notification of its own migration. IKEv2 MOBIKE / address-update

handling inside a netns is silently broken.

Thread struct net through km_migrate() and the xfrm_mgr.migrate

function pointer, drop the &init_net override in xfrm_send_migrate()

and pfkey_send_migrate(), and pass the caller's net (already in

scope in xfrm_migrate() via sock_net(skb->sk)) all the way down.

struct xfrm_mgr is in-tree only and not exported as a stable API,

so the function-pointer signature change is internal.

pfkey_broadcast() is already netns-aware via net_generic(net,

pfkey_net_id) since the pernet conversion. The five other

pfkey_broadcast() callers in af_key.c already pass xs_net(x),

sock_net(sk) or a per-netns net, so this only removes the

&init_net outlier. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References