rtnetlink: add missing netlink_ns_capable() check for peer netns

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Summary

CVECVE-2026-31692
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-30 11:16:20 UTC
Updated2026-05-06 20:05:55 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000230000 probability, percentile 0.062760000 (date 2026-05-05)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 81adee47dfb608df3ad0b91d230fb3cef75f0060 0975b64ffb34560042090a5986c3a02e6c80f36f git Not specified
CNA Linux Linux affected 81adee47dfb608df3ad0b91d230fb3cef75f0060 d04cc16d3624218a5458b2b664ae431f1b3b334d git Not specified
CNA Linux Linux affected 81adee47dfb608df3ad0b91d230fb3cef75f0060 7b735ef81286007794a227ce2539419479c02a5f git Not specified
CNA Linux Linux affected 2.6.33 Not specified
CNA Linux Linux unaffected 2.6.33 semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0975b64ffb34560042090a5986c3a02e6c80f36f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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