geneve: require CAP_NET_ADMIN in the device netns for changelink

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68142
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:19:59 UTC
Updated2026-08-19 17:20:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: geneve: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the sticky underlay netns geneve->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in geneve->net can rewrite a geneve device whose underlay lives in geneve->net. geneve_changelink() applies the new configuration against geneve->net: geneve_link_config() and the geneve_quiesce()/geneve_unquiesce() pair reopen the underlay sockets in that netns (geneve_sock_add() uses geneve->net), so the same reasoning as the tunnel changelink series applies here. Gate geneve_changelink() with rtnl_dev_link_net_capable(), at the top of the op before any attribute is parsed, matching ipgre_changelink() and the rest of the "require CAP_NET_ADMIN in the device netns for changelink" series. Found by 0sec automated security-research tooling (https://0sec.ai).

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001380000 probability, percentile 0.036480000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a a5522963c57f12df5f9db804ebfc472b58eef0ae git Not specified
CNA Linux Linux affected 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a 278c6a31ee27c931c722202c8c06cc3253923254 git Not specified
CNA Linux Linux affected 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a 11a7d989d00160481a273eb4f7f05f64b5a6ffdf git Not specified
CNA Linux Linux affected 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a 2abdacc927c92fa6a9cc8341e8c9b88dcb561553 git Not specified
CNA Linux Linux affected 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a 9de5518fc1fab583526a8f66b8e505c4864dc60a git Not specified
CNA Linux Linux affected 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a f8c498585d2a08aa623748353c3e61467b7e9fd2 git Not specified
CNA Linux Linux affected 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a 95f45e20f1b2cec13823f0f68060ab4b2261b2c1 git Not specified
CNA Linux Linux affected 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a 8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01 git Not specified
CNA Linux Linux affected 4.14 Not specified
CNA Linux Linux unaffected 4.14 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9de5518fc1fab583526a8f66b8e505c4864dc60a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a5522963c57f12df5f9db804ebfc472b58eef0ae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/95f45e20f1b2cec13823f0f68060ab4b2261b2c1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f8c498585d2a08aa623748353c3e61467b7e9fd2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/278c6a31ee27c931c722202c8c06cc3253923254 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2abdacc927c92fa6a9cc8341e8c9b88dcb561553 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/11a7d989d00160481a273eb4f7f05f64b5a6ffdf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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