xfrm: route MIGRATE notifications to caller's netns

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63914
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:09 UTC
Updated2026-07-20 15:16:55 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L

EPSS: 0.002100000 probability, percentile 0.113670000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L
3.1CNADECLARED7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
Low

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad git Not specified
CNA Linux Linux affected 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 6df8157547347b5257bf640a0ae3dfc4411e06cd git Not specified
CNA Linux Linux affected 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 fe463798343382c8fe9416a95959f005a3c30aa5 git Not specified
CNA Linux Linux affected 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 00f2c451e57df50b1151d9b2254878f106b7c892 git Not specified
CNA Linux Linux affected 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 a306cf2ac8849c487791369fad6f216399d000f6 git Not specified
CNA Linux Linux affected 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 448bb92ca101dde8a6e88b4dc824044b4e341604 git Not specified
CNA Linux Linux affected 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126 git Not specified
CNA Linux Linux affected 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4 git Not specified
CNA Linux Linux affected 2.6.21 Not specified
CNA Linux Linux unaffected 2.6.21 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/448bb92ca101dde8a6e88b4dc824044b4e341604 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6df8157547347b5257bf640a0ae3dfc4411e06cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe463798343382c8fe9416a95959f005a3c30aa5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/00f2c451e57df50b1151d9b2254878f106b7c892 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a306cf2ac8849c487791369fad6f216399d000f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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