CVE-2026-31692 (GCVE-0-2026-31692)

Vulnerability from cvelistv5 – Published: 2026-04-30 10:34 – Updated: 2026-05-11 22:13
VLAI
Title
rtnetlink: add missing netlink_ns_capable() check for peer netns
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 81adee47dfb608df3ad0b91d230fb3cef75f0060 , < 0975b64ffb34560042090a5986c3a02e6c80f36f (git)
Affected: 81adee47dfb608df3ad0b91d230fb3cef75f0060 , < d04cc16d3624218a5458b2b664ae431f1b3b334d (git)
Affected: 81adee47dfb608df3ad0b91d230fb3cef75f0060 , < 7b735ef81286007794a227ce2539419479c02a5f (git)
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Linux Linux Affected: 2.6.33
Unaffected: 0 , < 2.6.33 (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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