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CVE-2026-63914

xfrm: route MIGRATE notifications to caller's netns

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 · fixed in bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad; From 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 · fixed in 6df8157547347b5257bf640a0ae3dfc4411e06cd; From 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 · fixed in fe463798343382c8fe9416a95959f005a3c30aa5; From 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 · fixed in 00f2c451e57df50b1151d9b2254878f106b7c892; From 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 · fixed in a306cf2ac8849c487791369fad6f216399d000f6; From 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 · fixed in 448bb92ca101dde8a6e88b4dc824044b4e341604; From 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 · fixed in 26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126; From 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 · fixed in 7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4

  • Linux Linux

    2.6.21

  • KernelLinux

    From 2.6.21 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.93; From 6.13.0 · fixed in 6.18.35; From 6.19.0 · fixed in 7.0.12

References 8

git.kernel.org