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Fencer Vulns
medium 5.5

CVE-2026-31692 json

rtnetlink: add missing netlink_ns_capable() check for peer netns

published 2026-04-30 6 mo ago modified 2026-11-06 3 d ago also EUVD-2026-26363

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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

rtnetlink: add missing netlink_ns_capable() check for peer netns

rtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer network namespace when creating paired devices (veth, vxcan, netkit). This allows an unprivileged user with a user namespace to create interfaces in arbitrary network namespaces, including init_net.

Add a netlink_ns_capable() check for CAP_NET_ADMIN in the peer namespace before allowing device creation to proceed.

Patch / fix

  • Linux Linux 6.18.24, 6.19.14, 7.0
  • linux Debian 14 6.19.14-1

debian advisories DEBIAN-CVE-2026-31692

  • linux-nvidia Ubuntu 26.04 LTS 7.0.0-1006.6

ubuntu advisories UBUNTU-CVE-2026-31692

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

  • kernel RHEL 9 5.14.0-687.47.1.el9_8
  • rv RHEL 9 5.14.0-687.47.1.el9_8
  • perf RHEL 9 5.14.0-687.47.1.el9_8
  • rtla RHEL 9 5.14.0-687.47.1.el9_8
  • libperf RHEL 9 5.14.0-687.47.1.el9_8
  • kernel-rt RHEL 9 5.14.0-687.47.1.el9_8
  • kernel-64k RHEL 9 5.14.0-687.47.1.el9_8
  • kernel-core RHEL 9 5.14.0-687.47.1.el9_8

red hat advisories RHSA-2026:69837RHSA-2026:67150RHSA-2026:49214RHSA-2026:49213RHSA-2026:45114

  • kernel AlmaLinux 9 5.14.0-687.47.1.el9_8
  • rv AlmaLinux 9 5.14.0-687.47.1.el9_8
  • perf AlmaLinux 9 5.14.0-687.47.1.el9_8
  • rtla AlmaLinux 9 5.14.0-687.47.1.el9_8
  • libperf AlmaLinux 9 5.14.0-687.47.1.el9_8
  • kernel-rt AlmaLinux 9 5.14.0-687.47.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.47.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.47.1.el9_8

almalinux advisories ALSA-2026:67150ALSA-2026:49213ALSA-2026:49214ALSA-2026:45114

  • kernel Rocky Linux 9 5.14.0-687.47.1.el9_8
  • kernel-rt Rocky Linux 8 4.18.0-553.150.1.rt7.491.el8_10
  • kernel Rocky Linux 8 4.18.0-553.150.1.el8_10
  • kernel Rocky Linux 10 6.12.0-211.39.1.el10_2

rocky linux advisories RLSA-2026:67150RLSA-2026:49213RLSA-2026:49214RLSA-2026:45114

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-2026-31692 updated cvss 7.1

kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns

  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 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: no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.47.1.el9_8, perf 5.14.0-687.47.1.el9_8, rtla 5.14.0-687.47.1.el9_8, python3-perf 5.14.0-687.47.1.el9_8, kernel-devel-matched 5.14.0-687.47.1.el9_8, kernel-64k-devel-matched 5.14.0-687.47.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:67150
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.39.1.el10_2, perf 6.12.0-211.39.1.el10_2, rtla 6.12.0-211.39.1.el10_2, python3-perf 6.12.0-211.39.1.el10_2, kernel-devel-matched 6.12.0-211.39.1.el10_2, kernel-64k-devel-matched 6.12.0-211.39.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:45114
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.150.1.el8_10, kernel 4.18.0-553.150.1.el8_10, bpftool 4.18.0-553.150.1.el8_10, kernel-core 4.18.0-553.150.1.el8_10, kernel-tools 4.18.0-553.150.1.el8_10, python3-perf 4.18.0-553.150.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:49214
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.47.1.el9_8, kernel-64k 5.14.0-687.47.1.el9_8, kernel-core 5.14.0-687.47.1.el9_8, kernel-tools 5.14.0-687.47.1.el9_8, kernel-modules 5.14.0-687.47.1.el9_8, kernel-64k-core 5.14.0-687.47.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:67150
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.39.1.el10_2, kernel-64k 6.12.0-211.39.1.el10_2, kernel-core 6.12.0-211.39.1.el10_2, kernel-tools 6.12.0-211.39.1.el10_2, kernel-modules 6.12.0-211.39.1.el10_2, kernel-64k-core 6.12.0-211.39.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:45114
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.216.1.el8_4, kernel 4.18.0-305.216.1.el8_4, bpftool 4.18.0-305.216.1.el8_4, kernel-core 4.18.0-305.216.1.el8_4, kernel-tools 4.18.0-305.216.1.el8_4, python3-perf 4.18.0-305.216.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:91585
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.168.1.el8_8, kernel 4.18.0-477.168.1.el8_8, bpftool 4.18.0-477.168.1.el8_8, kernel-core 4.18.0-477.168.1.el8_8, kernel-tools 4.18.0-477.168.1.el8_8, python3-perf 4.18.0-477.168.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:69837
show 12 more
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.216.1.el8_4, kernel 4.18.0-305.216.1.el8_4, bpftool 4.18.0-305.216.1.el8_4, kernel-core 4.18.0-305.216.1.el8_4, kernel-tools 4.18.0-305.216.1.el8_4, python3-perf 4.18.0-305.216.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:91585
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.168.1.el8_8, kernel 4.18.0-477.168.1.el8_8, bpftool 4.18.0-477.168.1.el8_8, kernel-core 4.18.0-477.168.1.el8_8, kernel-tools 4.18.0-477.168.1.el8_8, python3-perf 4.18.0-477.168.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:69837
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.47.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.47.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.47.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.47.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.47.1.el9_8
    fixed: vendor fix RHSA-2026:67150
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.39.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.39.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.39.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.39.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.39.1.el10_2
    fixed: vendor fix RHSA-2026:45114
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.150.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.150.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.150.1.el8_10
    fixed: vendor fix RHSA-2026:49214
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-kvm 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-core 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-modules 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-debug-kvm 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-debug-core 4.18.0-553.150.1.rt7.491.el8_10, +4 more
    fixed: vendor fix RHSA-2026:49213
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.47.1.el9_8, kernel-rt-64k 5.14.0-687.47.1.el9_8, kernel-rt-core 5.14.0-687.47.1.el9_8, kernel-rt-modules 5.14.0-687.47.1.el9_8, kernel-rt-64k-core 5.14.0-687.47.1.el9_8, kernel-rt-debug-core 5.14.0-687.47.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:67150
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.39.1.el10_2, kernel-rt-64k 6.12.0-211.39.1.el10_2, kernel-rt-core 6.12.0-211.39.1.el10_2, kernel-rt-modules 6.12.0-211.39.1.el10_2, kernel-rt-64k-core 6.12.0-211.39.1.el10_2, kernel-rt-debug-core 6.12.0-211.39.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:45114
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.47.1.el9_8, kernel-rt-core 5.14.0-687.47.1.el9_8, kernel-rt-modules 5.14.0-687.47.1.el9_8, kernel-rt-debug-core 5.14.0-687.47.1.el9_8, kernel-rt-modules-core 5.14.0-687.47.1.el9_8, kernel-rt-debug-modules 5.14.0-687.47.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:67150
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.39.1.el10_2, kernel-rt-core 6.12.0-211.39.1.el10_2, kernel-rt-modules 6.12.0-211.39.1.el10_2, kernel-rt-debug-core 6.12.0-211.39.1.el10_2, kernel-rt-modules-core 6.12.0-211.39.1.el10_2, kernel-rt-debug-modules 6.12.0-211.39.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:45114
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-core 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-modules 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-debug-core 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-debug-modules 4.18.0-553.150.1.rt7.491.el8_10, kernel-rt-modules-extra 4.18.0-553.150.1.rt7.491.el8_10, +2 more
    fixed: vendor fix RHSA-2026:49213
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    not affected: vulnerable code not present

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
3 d ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Vulns 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.