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Fencer Intel
high 7.3

CVE-2026-63914 json

xfrm: route MIGRATE notifications to caller's netns

published 3mo ago modified 12d ago also EUVD-2026-45687

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

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.

Patch / fix

  • Linux Linux 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12, 7.1
  • linux Debian 12 6.1.176-1
  • linux Debian 13 6.12.94-1
  • linux Debian 14 7.0.12-1

debian advisories DEBIAN-CVE-2026-63914

  • linux Ubuntu 22.04 LTS 5.15.0-198.208
  • linux Ubuntu 24.04 LTS 6.8.0-146.146
  • linux Ubuntu 26.04 LTS 7.0.0-28.28
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1117.124
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1066.69
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1009.9
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1118.128
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1070.78

ubuntu advisories UBUNTU-CVE-2026-63914

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-63914 updated cvss 5.2

kernel: xfrm: route MIGRATE notifications to caller's netns

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-741.14.1.el9_9, perf 5.14.0-741.14.1.el9_9, rtla 5.14.0-741.14.1.el9_9, python3-perf 5.14.0-741.14.1.el9_9, kernel-devel-matched 5.14.0-741.14.1.el9_9, kernel-64k-devel-matched 5.14.0-741.14.1.el9_9, +7 more
    fixed: vendor fix RHSA-2026:97435
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-264.9.1.el10_3, perf 6.12.0-264.9.1.el10_3, rtla 6.12.0-264.9.1.el10_3, python3-perf 6.12.0-264.9.1.el10_3, kernel-devel-matched 6.12.0-264.9.1.el10_3, kernel-64k-devel-matched 6.12.0-264.9.1.el10_3, +7 more
    fixed: vendor fix RHSA-2026:97040
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-741.14.1.el9_9, kernel-64k 5.14.0-741.14.1.el9_9, kernel-core 5.14.0-741.14.1.el9_9, kernel-tools 5.14.0-741.14.1.el9_9, kernel-modules 5.14.0-741.14.1.el9_9, kernel-64k-core 5.14.0-741.14.1.el9_9, +27 more
    fixed: vendor fix RHSA-2026:97435
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-264.9.1.el10_3, kernel-64k 6.12.0-264.9.1.el10_3, kernel-core 6.12.0-264.9.1.el10_3, kernel-tools 6.12.0-264.9.1.el10_3, kernel-modules 6.12.0-264.9.1.el10_3, kernel-64k-core 6.12.0-264.9.1.el10_3, +28 more
    fixed: vendor fix RHSA-2026:97040
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-741.14.1.el9_9, kernel-debuginfo-common-s390x 5.14.0-741.14.1.el9_9, kernel-debuginfo-common-x86_64 5.14.0-741.14.1.el9_9, kernel-debuginfo-common-aarch64 5.14.0-741.14.1.el9_9, kernel-debuginfo-common-ppc64le 5.14.0-741.14.1.el9_9
    fixed: vendor fix RHSA-2026:97435
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-264.9.1.el10_3, kernel-debuginfo-common-s390x 6.12.0-264.9.1.el10_3, kernel-debuginfo-common-x86_64 6.12.0-264.9.1.el10_3, kernel-debuginfo-common-aarch64 6.12.0-264.9.1.el10_3, kernel-debuginfo-common-ppc64le 6.12.0-264.9.1.el10_3
    fixed: vendor fix RHSA-2026:97040
show 4 more
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-741.14.1.el9_9, kernel-rt-64k 5.14.0-741.14.1.el9_9, kernel-rt-core 5.14.0-741.14.1.el9_9, kernel-rt-modules 5.14.0-741.14.1.el9_9, kernel-rt-64k-core 5.14.0-741.14.1.el9_9, kernel-rt-debug-core 5.14.0-741.14.1.el9_9, +14 more
    fixed: vendor fix RHSA-2026:97435
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-264.9.1.el10_3, kernel-rt-64k 6.12.0-264.9.1.el10_3, kernel-rt-core 6.12.0-264.9.1.el10_3, kernel-rt-modules 6.12.0-264.9.1.el10_3, kernel-rt-64k-core 6.12.0-264.9.1.el10_3, kernel-rt-debug-core 6.12.0-264.9.1.el10_3, +14 more
    fixed: vendor fix RHSA-2026:97040
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-741.14.1.el9_9, kernel-rt-core 5.14.0-741.14.1.el9_9, kernel-rt-modules 5.14.0-741.14.1.el9_9, kernel-rt-debug-core 5.14.0-741.14.1.el9_9, kernel-rt-modules-core 5.14.0-741.14.1.el9_9, kernel-rt-debug-modules 5.14.0-741.14.1.el9_9, +5 more
    fixed: vendor fix RHSA-2026:97435
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-264.9.1.el10_3, kernel-rt-core 6.12.0-264.9.1.el10_3, kernel-rt-modules 6.12.0-264.9.1.el10_3, kernel-rt-debug-core 6.12.0-264.9.1.el10_3, kernel-rt-modules-core 6.12.0-264.9.1.el10_3, kernel-rt-debug-modules 6.12.0-264.9.1.el10_3, +5 more
    fixed: vendor fix RHSA-2026:97040

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
26d ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-862 Missing Authorization
  • CWE-668 Exposure of Resource to Wrong Sphere
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.